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[/] [openrisc/] [trunk/] [gnu-old/] [gcc-4.2.2/] [gcc/] [optabs.c] - Rev 816
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/* Expand the basic unary and binary arithmetic operations, for GNU compiler. Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007 Free Software Foundation, Inc. This file is part of GCC. GCC is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3, or (at your option) any later version. GCC is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with GCC; see the file COPYING3. If not see <http://www.gnu.org/licenses/>. */ #include "config.h" #include "system.h" #include "coretypes.h" #include "tm.h" #include "toplev.h" /* Include insn-config.h before expr.h so that HAVE_conditional_move is properly defined. */ #include "insn-config.h" #include "rtl.h" #include "tree.h" #include "tm_p.h" #include "flags.h" #include "function.h" #include "except.h" #include "expr.h" #include "optabs.h" #include "libfuncs.h" #include "recog.h" #include "reload.h" #include "ggc.h" #include "real.h" #include "basic-block.h" #include "target.h" /* Each optab contains info on how this target machine can perform a particular operation for all sizes and kinds of operands. The operation to be performed is often specified by passing one of these optabs as an argument. See expr.h for documentation of these optabs. */ optab optab_table[OTI_MAX]; rtx libfunc_table[LTI_MAX]; /* Tables of patterns for converting one mode to another. */ convert_optab convert_optab_table[COI_MAX]; /* Contains the optab used for each rtx code. */ optab code_to_optab[NUM_RTX_CODE + 1]; /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...) gives the gen_function to make a branch to test that condition. */ rtxfun bcc_gen_fctn[NUM_RTX_CODE]; /* Indexed by the rtx-code for a conditional (eg. EQ, LT,...) gives the insn code to make a store-condition insn to test that condition. */ enum insn_code setcc_gen_code[NUM_RTX_CODE]; #ifdef HAVE_conditional_move /* Indexed by the machine mode, gives the insn code to make a conditional move insn. This is not indexed by the rtx-code like bcc_gen_fctn and setcc_gen_code to cut down on the number of named patterns. Consider a day when a lot more rtx codes are conditional (eg: for the ARM). */ enum insn_code movcc_gen_code[NUM_MACHINE_MODES]; #endif /* Indexed by the machine mode, gives the insn code for vector conditional operation. */ enum insn_code vcond_gen_code[NUM_MACHINE_MODES]; enum insn_code vcondu_gen_code[NUM_MACHINE_MODES]; /* The insn generating function can not take an rtx_code argument. TRAP_RTX is used as an rtx argument. Its code is replaced with the code to be used in the trap insn and all other fields are ignored. */ static GTY(()) rtx trap_rtx; static int add_equal_note (rtx, rtx, enum rtx_code, rtx, rtx); static rtx widen_operand (rtx, enum machine_mode, enum machine_mode, int, int); static void prepare_cmp_insn (rtx *, rtx *, enum rtx_code *, rtx, enum machine_mode *, int *, enum can_compare_purpose); static enum insn_code can_fix_p (enum machine_mode, enum machine_mode, int, int *); static enum insn_code can_float_p (enum machine_mode, enum machine_mode, int); static optab new_optab (void); static convert_optab new_convert_optab (void); static inline optab init_optab (enum rtx_code); static inline optab init_optabv (enum rtx_code); static inline convert_optab init_convert_optab (enum rtx_code); static void init_libfuncs (optab, int, int, const char *, int); static void init_integral_libfuncs (optab, const char *, int); static void init_floating_libfuncs (optab, const char *, int); static void init_interclass_conv_libfuncs (convert_optab, const char *, enum mode_class, enum mode_class); static void init_intraclass_conv_libfuncs (convert_optab, const char *, enum mode_class, bool); static void emit_cmp_and_jump_insn_1 (rtx, rtx, enum machine_mode, enum rtx_code, int, rtx); static void prepare_float_lib_cmp (rtx *, rtx *, enum rtx_code *, enum machine_mode *, int *); static rtx widen_clz (enum machine_mode, rtx, rtx); static rtx expand_parity (enum machine_mode, rtx, rtx); static enum rtx_code get_rtx_code (enum tree_code, bool); static rtx vector_compare_rtx (tree, bool, enum insn_code); #ifndef HAVE_conditional_trap #define HAVE_conditional_trap 0 #define gen_conditional_trap(a,b) (gcc_unreachable (), NULL_RTX) #endif /* Add a REG_EQUAL note to the last insn in INSNS. TARGET is being set to the result of operation CODE applied to OP0 (and OP1 if it is a binary operation). If the last insn does not set TARGET, don't do anything, but return 1. If a previous insn sets TARGET and TARGET is one of OP0 or OP1, don't add the REG_EQUAL note but return 0. Our caller can then try again, ensuring that TARGET is not one of the operands. */ static int add_equal_note (rtx insns, rtx target, enum rtx_code code, rtx op0, rtx op1) { rtx last_insn, insn, set; rtx note; gcc_assert (insns && INSN_P (insns) && NEXT_INSN (insns)); if (GET_RTX_CLASS (code) != RTX_COMM_ARITH && GET_RTX_CLASS (code) != RTX_BIN_ARITH && GET_RTX_CLASS (code) != RTX_COMM_COMPARE && GET_RTX_CLASS (code) != RTX_COMPARE && GET_RTX_CLASS (code) != RTX_UNARY) return 1; if (GET_CODE (target) == ZERO_EXTRACT) return 1; for (last_insn = insns; NEXT_INSN (last_insn) != NULL_RTX; last_insn = NEXT_INSN (last_insn)) ; set = single_set (last_insn); if (set == NULL_RTX) return 1; if (! rtx_equal_p (SET_DEST (set), target) /* For a STRICT_LOW_PART, the REG_NOTE applies to what is inside it. */ && (GET_CODE (SET_DEST (set)) != STRICT_LOW_PART || ! rtx_equal_p (XEXP (SET_DEST (set), 0), target))) return 1; /* If TARGET is in OP0 or OP1, check if anything in SEQ sets TARGET besides the last insn. */ if (reg_overlap_mentioned_p (target, op0) || (op1 && reg_overlap_mentioned_p (target, op1))) { insn = PREV_INSN (last_insn); while (insn != NULL_RTX) { if (reg_set_p (target, insn)) return 0; insn = PREV_INSN (insn); } } if (GET_RTX_CLASS (code) == RTX_UNARY) note = gen_rtx_fmt_e (code, GET_MODE (target), copy_rtx (op0)); else note = gen_rtx_fmt_ee (code, GET_MODE (target), copy_rtx (op0), copy_rtx (op1)); set_unique_reg_note (last_insn, REG_EQUAL, note); return 1; } /* Widen OP to MODE and return the rtx for the widened operand. UNSIGNEDP says whether OP is signed or unsigned. NO_EXTEND is nonzero if we need not actually do a sign-extend or zero-extend, but can leave the higher-order bits of the result rtx undefined, for example, in the case of logical operations, but not right shifts. */ static rtx widen_operand (rtx op, enum machine_mode mode, enum machine_mode oldmode, int unsignedp, int no_extend) { rtx result; /* If we don't have to extend and this is a constant, return it. */ if (no_extend && GET_MODE (op) == VOIDmode) return op; /* If we must extend do so. If OP is a SUBREG for a promoted object, also extend since it will be more efficient to do so unless the signedness of a promoted object differs from our extension. */ if (! no_extend || (GET_CODE (op) == SUBREG && SUBREG_PROMOTED_VAR_P (op) && SUBREG_PROMOTED_UNSIGNED_P (op) == unsignedp)) return convert_modes (mode, oldmode, op, unsignedp); /* If MODE is no wider than a single word, we return a paradoxical SUBREG. */ if (GET_MODE_SIZE (mode) <= UNITS_PER_WORD) return gen_rtx_SUBREG (mode, force_reg (GET_MODE (op), op), 0); /* Otherwise, get an object of MODE, clobber it, and set the low-order part to OP. */ result = gen_reg_rtx (mode); emit_insn (gen_rtx_CLOBBER (VOIDmode, result)); emit_move_insn (gen_lowpart (GET_MODE (op), result), op); return result; } /* Return the optab used for computing the operation given by the tree code, CODE. This function is not always usable (for example, it cannot give complete results for multiplication or division) but probably ought to be relied on more widely throughout the expander. */ optab optab_for_tree_code (enum tree_code code, tree type) { bool trapv; switch (code) { case BIT_AND_EXPR: return and_optab; case BIT_IOR_EXPR: return ior_optab; case BIT_NOT_EXPR: return one_cmpl_optab; case BIT_XOR_EXPR: return xor_optab; case TRUNC_MOD_EXPR: case CEIL_MOD_EXPR: case FLOOR_MOD_EXPR: case ROUND_MOD_EXPR: return TYPE_UNSIGNED (type) ? umod_optab : smod_optab; case RDIV_EXPR: case TRUNC_DIV_EXPR: case CEIL_DIV_EXPR: case FLOOR_DIV_EXPR: case ROUND_DIV_EXPR: case EXACT_DIV_EXPR: return TYPE_UNSIGNED (type) ? udiv_optab : sdiv_optab; case LSHIFT_EXPR: return ashl_optab; case RSHIFT_EXPR: return TYPE_UNSIGNED (type) ? lshr_optab : ashr_optab; case LROTATE_EXPR: return rotl_optab; case RROTATE_EXPR: return rotr_optab; case MAX_EXPR: return TYPE_UNSIGNED (type) ? umax_optab : smax_optab; case MIN_EXPR: return TYPE_UNSIGNED (type) ? umin_optab : smin_optab; case REALIGN_LOAD_EXPR: return vec_realign_load_optab; case WIDEN_SUM_EXPR: return TYPE_UNSIGNED (type) ? usum_widen_optab : ssum_widen_optab; case DOT_PROD_EXPR: return TYPE_UNSIGNED (type) ? udot_prod_optab : sdot_prod_optab; case REDUC_MAX_EXPR: return TYPE_UNSIGNED (type) ? reduc_umax_optab : reduc_smax_optab; case REDUC_MIN_EXPR: return TYPE_UNSIGNED (type) ? reduc_umin_optab : reduc_smin_optab; case REDUC_PLUS_EXPR: return TYPE_UNSIGNED (type) ? reduc_uplus_optab : reduc_splus_optab; case VEC_LSHIFT_EXPR: return vec_shl_optab; case VEC_RSHIFT_EXPR: return vec_shr_optab; default: break; } trapv = INTEGRAL_TYPE_P (type) && TYPE_OVERFLOW_TRAPS (type); switch (code) { case PLUS_EXPR: return trapv ? addv_optab : add_optab; case MINUS_EXPR: return trapv ? subv_optab : sub_optab; case MULT_EXPR: return trapv ? smulv_optab : smul_optab; case NEGATE_EXPR: return trapv ? negv_optab : neg_optab; case ABS_EXPR: return trapv ? absv_optab : abs_optab; default: return NULL; } } /* Expand vector widening operations. There are two different classes of operations handled here: 1) Operations whose result is wider than all the arguments to the operation. Examples: VEC_UNPACK_HI/LO_EXPR, VEC_WIDEN_MULT_HI/LO_EXPR In this case OP0 and optionally OP1 would be initialized, but WIDE_OP wouldn't (not relevant for this case). 2) Operations whose result is of the same size as the last argument to the operation, but wider than all the other arguments to the operation. Examples: WIDEN_SUM_EXPR, VEC_DOT_PROD_EXPR. In the case WIDE_OP, OP0 and optionally OP1 would be initialized. E.g, when called to expand the following operations, this is how the arguments will be initialized: nops OP0 OP1 WIDE_OP widening-sum 2 oprnd0 - oprnd1 widening-dot-product 3 oprnd0 oprnd1 oprnd2 widening-mult 2 oprnd0 oprnd1 - type-promotion (vec-unpack) 1 oprnd0 - - */ rtx expand_widen_pattern_expr (tree exp, rtx op0, rtx op1, rtx wide_op, rtx target, int unsignedp) { tree oprnd0, oprnd1, oprnd2; enum machine_mode wmode = 0, tmode0, tmode1 = 0; optab widen_pattern_optab; int icode; enum machine_mode xmode0, xmode1 = 0, wxmode = 0; rtx temp; rtx pat; rtx xop0, xop1, wxop; int nops = TREE_CODE_LENGTH (TREE_CODE (exp)); oprnd0 = TREE_OPERAND (exp, 0); tmode0 = TYPE_MODE (TREE_TYPE (oprnd0)); widen_pattern_optab = optab_for_tree_code (TREE_CODE (exp), TREE_TYPE (oprnd0)); icode = (int) widen_pattern_optab->handlers[(int) tmode0].insn_code; gcc_assert (icode != CODE_FOR_nothing); xmode0 = insn_data[icode].operand[1].mode; if (nops >= 2) { oprnd1 = TREE_OPERAND (exp, 1); tmode1 = TYPE_MODE (TREE_TYPE (oprnd1)); xmode1 = insn_data[icode].operand[2].mode; } /* The last operand is of a wider mode than the rest of the operands. */ if (nops == 2) { wmode = tmode1; wxmode = xmode1; } else if (nops == 3) { gcc_assert (tmode1 == tmode0); gcc_assert (op1); oprnd2 = TREE_OPERAND (exp, 2); wmode = TYPE_MODE (TREE_TYPE (oprnd2)); wxmode = insn_data[icode].operand[3].mode; } if (!wide_op) wmode = wxmode = insn_data[icode].operand[0].mode; if (!target || ! (*insn_data[icode].operand[0].predicate) (target, wmode)) temp = gen_reg_rtx (wmode); else temp = target; xop0 = op0; xop1 = op1; wxop = wide_op; /* In case the insn wants input operands in modes different from those of the actual operands, convert the operands. It would seem that we don't need to convert CONST_INTs, but we do, so that they're properly zero-extended, sign-extended or truncated for their mode. */ if (GET_MODE (op0) != xmode0 && xmode0 != VOIDmode) xop0 = convert_modes (xmode0, GET_MODE (op0) != VOIDmode ? GET_MODE (op0) : tmode0, xop0, unsignedp); if (op1) if (GET_MODE (op1) != xmode1 && xmode1 != VOIDmode) xop1 = convert_modes (xmode1, GET_MODE (op1) != VOIDmode ? GET_MODE (op1) : tmode1, xop1, unsignedp); if (wide_op) if (GET_MODE (wide_op) != wxmode && wxmode != VOIDmode) wxop = convert_modes (wxmode, GET_MODE (wide_op) != VOIDmode ? GET_MODE (wide_op) : wmode, wxop, unsignedp); /* Now, if insn's predicates don't allow our operands, put them into pseudo regs. */ if (! (*insn_data[icode].operand[1].predicate) (xop0, xmode0) && xmode0 != VOIDmode) xop0 = copy_to_mode_reg (xmode0, xop0); if (op1) { if (! (*insn_data[icode].operand[2].predicate) (xop1, xmode1) && xmode1 != VOIDmode) xop1 = copy_to_mode_reg (xmode1, xop1); if (wide_op) { if (! (*insn_data[icode].operand[3].predicate) (wxop, wxmode) && wxmode != VOIDmode) wxop = copy_to_mode_reg (wxmode, wxop); pat = GEN_FCN (icode) (temp, xop0, xop1, wxop); } else pat = GEN_FCN (icode) (temp, xop0, xop1); } else { if (wide_op) { if (! (*insn_data[icode].operand[2].predicate) (wxop, wxmode) && wxmode != VOIDmode) wxop = copy_to_mode_reg (wxmode, wxop); pat = GEN_FCN (icode) (temp, xop0, wxop); } else pat = GEN_FCN (icode) (temp, xop0); } emit_insn (pat); return temp; } /* Generate code to perform an operation specified by TERNARY_OPTAB on operands OP0, OP1 and OP2, with result having machine-mode MODE. UNSIGNEDP is for the case where we have to widen the operands to perform the operation. It says to use zero-extension. If TARGET is nonzero, the value is generated there, if it is convenient to do so. In all cases an rtx is returned for the locus of the value; this may or may not be TARGET. */ rtx expand_ternary_op (enum machine_mode mode, optab ternary_optab, rtx op0, rtx op1, rtx op2, rtx target, int unsignedp) { int icode = (int) ternary_optab->handlers[(int) mode].insn_code; enum machine_mode mode0 = insn_data[icode].operand[1].mode; enum machine_mode mode1 = insn_data[icode].operand[2].mode; enum machine_mode mode2 = insn_data[icode].operand[3].mode; rtx temp; rtx pat; rtx xop0 = op0, xop1 = op1, xop2 = op2; gcc_assert (ternary_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing); if (!target || !insn_data[icode].operand[0].predicate (target, mode)) temp = gen_reg_rtx (mode); else temp = target; /* In case the insn wants input operands in modes different from those of the actual operands, convert the operands. It would seem that we don't need to convert CONST_INTs, but we do, so that they're properly zero-extended, sign-extended or truncated for their mode. */ if (GET_MODE (op0) != mode0 && mode0 != VOIDmode) xop0 = convert_modes (mode0, GET_MODE (op0) != VOIDmode ? GET_MODE (op0) : mode, xop0, unsignedp); if (GET_MODE (op1) != mode1 && mode1 != VOIDmode) xop1 = convert_modes (mode1, GET_MODE (op1) != VOIDmode ? GET_MODE (op1) : mode, xop1, unsignedp); if (GET_MODE (op2) != mode2 && mode2 != VOIDmode) xop2 = convert_modes (mode2, GET_MODE (op2) != VOIDmode ? GET_MODE (op2) : mode, xop2, unsignedp); /* Now, if insn's predicates don't allow our operands, put them into pseudo regs. */ if (!insn_data[icode].operand[1].predicate (xop0, mode0) && mode0 != VOIDmode) xop0 = copy_to_mode_reg (mode0, xop0); if (!insn_data[icode].operand[2].predicate (xop1, mode1) && mode1 != VOIDmode) xop1 = copy_to_mode_reg (mode1, xop1); if (!insn_data[icode].operand[3].predicate (xop2, mode2) && mode2 != VOIDmode) xop2 = copy_to_mode_reg (mode2, xop2); pat = GEN_FCN (icode) (temp, xop0, xop1, xop2); emit_insn (pat); return temp; } /* Like expand_binop, but return a constant rtx if the result can be calculated at compile time. The arguments and return value are otherwise the same as for expand_binop. */ static rtx simplify_expand_binop (enum machine_mode mode, optab binoptab, rtx op0, rtx op1, rtx target, int unsignedp, enum optab_methods methods) { if (CONSTANT_P (op0) && CONSTANT_P (op1)) { rtx x = simplify_binary_operation (binoptab->code, mode, op0, op1); if (x) return x; } return expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods); } /* Like simplify_expand_binop, but always put the result in TARGET. Return true if the expansion succeeded. */ bool force_expand_binop (enum machine_mode mode, optab binoptab, rtx op0, rtx op1, rtx target, int unsignedp, enum optab_methods methods) { rtx x = simplify_expand_binop (mode, binoptab, op0, op1, target, unsignedp, methods); if (x == 0) return false; if (x != target) emit_move_insn (target, x); return true; } /* Generate insns for VEC_LSHIFT_EXPR, VEC_RSHIFT_EXPR. */ rtx expand_vec_shift_expr (tree vec_shift_expr, rtx target) { enum insn_code icode; rtx rtx_op1, rtx_op2; enum machine_mode mode1; enum machine_mode mode2; enum machine_mode mode = TYPE_MODE (TREE_TYPE (vec_shift_expr)); tree vec_oprnd = TREE_OPERAND (vec_shift_expr, 0); tree shift_oprnd = TREE_OPERAND (vec_shift_expr, 1); optab shift_optab; rtx pat; switch (TREE_CODE (vec_shift_expr)) { case VEC_RSHIFT_EXPR: shift_optab = vec_shr_optab; break; case VEC_LSHIFT_EXPR: shift_optab = vec_shl_optab; break; default: gcc_unreachable (); } icode = (int) shift_optab->handlers[(int) mode].insn_code; gcc_assert (icode != CODE_FOR_nothing); mode1 = insn_data[icode].operand[1].mode; mode2 = insn_data[icode].operand[2].mode; rtx_op1 = expand_expr (vec_oprnd, NULL_RTX, VOIDmode, EXPAND_NORMAL); if (!(*insn_data[icode].operand[1].predicate) (rtx_op1, mode1) && mode1 != VOIDmode) rtx_op1 = force_reg (mode1, rtx_op1); rtx_op2 = expand_expr (shift_oprnd, NULL_RTX, VOIDmode, EXPAND_NORMAL); if (!(*insn_data[icode].operand[2].predicate) (rtx_op2, mode2) && mode2 != VOIDmode) rtx_op2 = force_reg (mode2, rtx_op2); if (!target || ! (*insn_data[icode].operand[0].predicate) (target, mode)) target = gen_reg_rtx (mode); /* Emit instruction */ pat = GEN_FCN (icode) (target, rtx_op1, rtx_op2); gcc_assert (pat); emit_insn (pat); return target; } /* This subroutine of expand_doubleword_shift handles the cases in which the effective shift value is >= BITS_PER_WORD. The arguments and return value are the same as for the parent routine, except that SUPERWORD_OP1 is the shift count to use when shifting OUTOF_INPUT into INTO_TARGET. INTO_TARGET may be null if the caller has decided to calculate it. */ static bool expand_superword_shift (optab binoptab, rtx outof_input, rtx superword_op1, rtx outof_target, rtx into_target, int unsignedp, enum optab_methods methods) { if (into_target != 0) if (!force_expand_binop (word_mode, binoptab, outof_input, superword_op1, into_target, unsignedp, methods)) return false; if (outof_target != 0) { /* For a signed right shift, we must fill OUTOF_TARGET with copies of the sign bit, otherwise we must fill it with zeros. */ if (binoptab != ashr_optab) emit_move_insn (outof_target, CONST0_RTX (word_mode)); else if (!force_expand_binop (word_mode, binoptab, outof_input, GEN_INT (BITS_PER_WORD - 1), outof_target, unsignedp, methods)) return false; } return true; } /* This subroutine of expand_doubleword_shift handles the cases in which the effective shift value is < BITS_PER_WORD. The arguments and return value are the same as for the parent routine. */ static bool expand_subword_shift (enum machine_mode op1_mode, optab binoptab, rtx outof_input, rtx into_input, rtx op1, rtx outof_target, rtx into_target, int unsignedp, enum optab_methods methods, unsigned HOST_WIDE_INT shift_mask) { optab reverse_unsigned_shift, unsigned_shift; rtx tmp, carries; reverse_unsigned_shift = (binoptab == ashl_optab ? lshr_optab : ashl_optab); unsigned_shift = (binoptab == ashl_optab ? ashl_optab : lshr_optab); /* The low OP1 bits of INTO_TARGET come from the high bits of OUTOF_INPUT. We therefore need to shift OUTOF_INPUT by (BITS_PER_WORD - OP1) bits in the opposite direction to BINOPTAB. */ if (CONSTANT_P (op1) || shift_mask >= BITS_PER_WORD) { carries = outof_input; tmp = immed_double_const (BITS_PER_WORD, 0, op1_mode); tmp = simplify_expand_binop (op1_mode, sub_optab, tmp, op1, 0, true, methods); } else { /* We must avoid shifting by BITS_PER_WORD bits since that is either the same as a zero shift (if shift_mask == BITS_PER_WORD - 1) or has unknown behavior. Do a single shift first, then shift by the remainder. It's OK to use ~OP1 as the remainder if shift counts are truncated to the mode size. */ carries = expand_binop (word_mode, reverse_unsigned_shift, outof_input, const1_rtx, 0, unsignedp, methods); if (shift_mask == BITS_PER_WORD - 1) { tmp = immed_double_const (-1, -1, op1_mode); tmp = simplify_expand_binop (op1_mode, xor_optab, op1, tmp, 0, true, methods); } else { tmp = immed_double_const (BITS_PER_WORD - 1, 0, op1_mode); tmp = simplify_expand_binop (op1_mode, sub_optab, tmp, op1, 0, true, methods); } } if (tmp == 0 || carries == 0) return false; carries = expand_binop (word_mode, reverse_unsigned_shift, carries, tmp, 0, unsignedp, methods); if (carries == 0) return false; /* Shift INTO_INPUT logically by OP1. This is the last use of INTO_INPUT so the result can go directly into INTO_TARGET if convenient. */ tmp = expand_binop (word_mode, unsigned_shift, into_input, op1, into_target, unsignedp, methods); if (tmp == 0) return false; /* Now OR in the bits carried over from OUTOF_INPUT. */ if (!force_expand_binop (word_mode, ior_optab, tmp, carries, into_target, unsignedp, methods)) return false; /* Use a standard word_mode shift for the out-of half. */ if (outof_target != 0) if (!force_expand_binop (word_mode, binoptab, outof_input, op1, outof_target, unsignedp, methods)) return false; return true; } #ifdef HAVE_conditional_move /* Try implementing expand_doubleword_shift using conditional moves. The shift is by < BITS_PER_WORD if (CMP_CODE CMP1 CMP2) is true, otherwise it is by >= BITS_PER_WORD. SUBWORD_OP1 and SUPERWORD_OP1 are the shift counts to use in the former and latter case. All other arguments are the same as the parent routine. */ static bool expand_doubleword_shift_condmove (enum machine_mode op1_mode, optab binoptab, enum rtx_code cmp_code, rtx cmp1, rtx cmp2, rtx outof_input, rtx into_input, rtx subword_op1, rtx superword_op1, rtx outof_target, rtx into_target, int unsignedp, enum optab_methods methods, unsigned HOST_WIDE_INT shift_mask) { rtx outof_superword, into_superword; /* Put the superword version of the output into OUTOF_SUPERWORD and INTO_SUPERWORD. */ outof_superword = outof_target != 0 ? gen_reg_rtx (word_mode) : 0; if (outof_target != 0 && subword_op1 == superword_op1) { /* The value INTO_TARGET >> SUBWORD_OP1, which we later store in OUTOF_TARGET, is the same as the value of INTO_SUPERWORD. */ into_superword = outof_target; if (!expand_superword_shift (binoptab, outof_input, superword_op1, outof_superword, 0, unsignedp, methods)) return false; } else { into_superword = gen_reg_rtx (word_mode); if (!expand_superword_shift (binoptab, outof_input, superword_op1, outof_superword, into_superword, unsignedp, methods)) return false; } /* Put the subword version directly in OUTOF_TARGET and INTO_TARGET. */ if (!expand_subword_shift (op1_mode, binoptab, outof_input, into_input, subword_op1, outof_target, into_target, unsignedp, methods, shift_mask)) return false; /* Select between them. Do the INTO half first because INTO_SUPERWORD might be the current value of OUTOF_TARGET. */ if (!emit_conditional_move (into_target, cmp_code, cmp1, cmp2, op1_mode, into_target, into_superword, word_mode, false)) return false; if (outof_target != 0) if (!emit_conditional_move (outof_target, cmp_code, cmp1, cmp2, op1_mode, outof_target, outof_superword, word_mode, false)) return false; return true; } #endif /* Expand a doubleword shift (ashl, ashr or lshr) using word-mode shifts. OUTOF_INPUT and INTO_INPUT are the two word-sized halves of the first input operand; the shift moves bits in the direction OUTOF_INPUT-> INTO_TARGET. OUTOF_TARGET and INTO_TARGET are the equivalent words of the target. OP1 is the shift count and OP1_MODE is its mode. If OP1 is constant, it will have been truncated as appropriate and is known to be nonzero. If SHIFT_MASK is zero, the result of word shifts is undefined when the shift count is outside the range [0, BITS_PER_WORD). This routine must avoid generating such shifts for OP1s in the range [0, BITS_PER_WORD * 2). If SHIFT_MASK is nonzero, all word-mode shift counts are effectively masked by it and shifts in the range [BITS_PER_WORD, SHIFT_MASK) will fill with zeros or sign bits as appropriate. If SHIFT_MASK is BITS_PER_WORD - 1, this routine will synthesize a doubleword shift whose equivalent mask is BITS_PER_WORD * 2 - 1. Doing this preserves semantics required by SHIFT_COUNT_TRUNCATED. In all other cases, shifts by values outside [0, BITS_PER_UNIT * 2) are undefined. BINOPTAB, UNSIGNEDP and METHODS are as for expand_binop. This function may not use INTO_INPUT after modifying INTO_TARGET, and similarly for OUTOF_INPUT and OUTOF_TARGET. OUTOF_TARGET can be null if the parent function wants to calculate it itself. Return true if the shift could be successfully synthesized. */ static bool expand_doubleword_shift (enum machine_mode op1_mode, optab binoptab, rtx outof_input, rtx into_input, rtx op1, rtx outof_target, rtx into_target, int unsignedp, enum optab_methods methods, unsigned HOST_WIDE_INT shift_mask) { rtx superword_op1, tmp, cmp1, cmp2; rtx subword_label, done_label; enum rtx_code cmp_code; /* See if word-mode shifts by BITS_PER_WORD...BITS_PER_WORD * 2 - 1 will fill the result with sign or zero bits as appropriate. If so, the value of OUTOF_TARGET will always be (SHIFT OUTOF_INPUT OP1). Recursively call this routine to calculate INTO_TARGET (which depends on both OUTOF_INPUT and INTO_INPUT), then emit code to set up OUTOF_TARGET. This isn't worthwhile for constant shifts since the optimizers will cope better with in-range shift counts. */ if (shift_mask >= BITS_PER_WORD && outof_target != 0 && !CONSTANT_P (op1)) { if (!expand_doubleword_shift (op1_mode, binoptab, outof_input, into_input, op1, 0, into_target, unsignedp, methods, shift_mask)) return false; if (!force_expand_binop (word_mode, binoptab, outof_input, op1, outof_target, unsignedp, methods)) return false; return true; } /* Set CMP_CODE, CMP1 and CMP2 so that the rtx (CMP_CODE CMP1 CMP2) is true when the effective shift value is less than BITS_PER_WORD. Set SUPERWORD_OP1 to the shift count that should be used to shift OUTOF_INPUT into INTO_TARGET when the condition is false. */ tmp = immed_double_const (BITS_PER_WORD, 0, op1_mode); if (!CONSTANT_P (op1) && shift_mask == BITS_PER_WORD - 1) { /* Set CMP1 to OP1 & BITS_PER_WORD. The result is zero iff OP1 is a subword shift count. */ cmp1 = simplify_expand_binop (op1_mode, and_optab, op1, tmp, 0, true, methods); cmp2 = CONST0_RTX (op1_mode); cmp_code = EQ; superword_op1 = op1; } else { /* Set CMP1 to OP1 - BITS_PER_WORD. */ cmp1 = simplify_expand_binop (op1_mode, sub_optab, op1, tmp, 0, true, methods); cmp2 = CONST0_RTX (op1_mode); cmp_code = LT; superword_op1 = cmp1; } if (cmp1 == 0) return false; /* If we can compute the condition at compile time, pick the appropriate subroutine. */ tmp = simplify_relational_operation (cmp_code, SImode, op1_mode, cmp1, cmp2); if (tmp != 0 && GET_CODE (tmp) == CONST_INT) { if (tmp == const0_rtx) return expand_superword_shift (binoptab, outof_input, superword_op1, outof_target, into_target, unsignedp, methods); else return expand_subword_shift (op1_mode, binoptab, outof_input, into_input, op1, outof_target, into_target, unsignedp, methods, shift_mask); } #ifdef HAVE_conditional_move /* Try using conditional moves to generate straight-line code. */ { rtx start = get_last_insn (); if (expand_doubleword_shift_condmove (op1_mode, binoptab, cmp_code, cmp1, cmp2, outof_input, into_input, op1, superword_op1, outof_target, into_target, unsignedp, methods, shift_mask)) return true; delete_insns_since (start); } #endif /* As a last resort, use branches to select the correct alternative. */ subword_label = gen_label_rtx (); done_label = gen_label_rtx (); NO_DEFER_POP; do_compare_rtx_and_jump (cmp1, cmp2, cmp_code, false, op1_mode, 0, 0, subword_label); OK_DEFER_POP; if (!expand_superword_shift (binoptab, outof_input, superword_op1, outof_target, into_target, unsignedp, methods)) return false; emit_jump_insn (gen_jump (done_label)); emit_barrier (); emit_label (subword_label); if (!expand_subword_shift (op1_mode, binoptab, outof_input, into_input, op1, outof_target, into_target, unsignedp, methods, shift_mask)) return false; emit_label (done_label); return true; } /* Subroutine of expand_binop. Perform a double word multiplication of operands OP0 and OP1 both of mode MODE, which is exactly twice as wide as the target's word_mode. This function return NULL_RTX if anything goes wrong, in which case it may have already emitted instructions which need to be deleted. If we want to multiply two two-word values and have normal and widening multiplies of single-word values, we can do this with three smaller multiplications. Note that we do not make a REG_NO_CONFLICT block here because we are not operating on one word at a time. The multiplication proceeds as follows: _______________________ [__op0_high_|__op0_low__] _______________________ * [__op1_high_|__op1_low__] _______________________________________________ _______________________ (1) [__op0_low__*__op1_low__] _______________________ (2a) [__op0_low__*__op1_high_] _______________________ (2b) [__op0_high_*__op1_low__] _______________________ (3) [__op0_high_*__op1_high_] This gives a 4-word result. Since we are only interested in the lower 2 words, partial result (3) and the upper words of (2a) and (2b) don't need to be calculated. Hence (2a) and (2b) can be calculated using non-widening multiplication. (1), however, needs to be calculated with an unsigned widening multiplication. If this operation is not directly supported we try using a signed widening multiplication and adjust the result. This adjustment works as follows: If both operands are positive then no adjustment is needed. If the operands have different signs, for example op0_low < 0 and op1_low >= 0, the instruction treats the most significant bit of op0_low as a sign bit instead of a bit with significance 2**(BITS_PER_WORD-1), i.e. the instruction multiplies op1_low with 2**BITS_PER_WORD - op0_low, and two's complements the result. Conclusion: We need to add op1_low * 2**BITS_PER_WORD to the result. Similarly, if both operands are negative, we need to add (op0_low + op1_low) * 2**BITS_PER_WORD. We use a trick to adjust quickly. We logically shift op0_low right (op1_low) BITS_PER_WORD-1 steps to get 0 or 1, and add this to op0_high (op1_high) before it is used to calculate 2b (2a). If no logical shift exists, we do an arithmetic right shift and subtract the 0 or -1. */ static rtx expand_doubleword_mult (enum machine_mode mode, rtx op0, rtx op1, rtx target, bool umulp, enum optab_methods methods) { int low = (WORDS_BIG_ENDIAN ? 1 : 0); int high = (WORDS_BIG_ENDIAN ? 0 : 1); rtx wordm1 = umulp ? NULL_RTX : GEN_INT (BITS_PER_WORD - 1); rtx product, adjust, product_high, temp; rtx op0_high = operand_subword_force (op0, high, mode); rtx op0_low = operand_subword_force (op0, low, mode); rtx op1_high = operand_subword_force (op1, high, mode); rtx op1_low = operand_subword_force (op1, low, mode); /* If we're using an unsigned multiply to directly compute the product of the low-order words of the operands and perform any required adjustments of the operands, we begin by trying two more multiplications and then computing the appropriate sum. We have checked above that the required addition is provided. Full-word addition will normally always succeed, especially if it is provided at all, so we don't worry about its failure. The multiplication may well fail, however, so we do handle that. */ if (!umulp) { /* ??? This could be done with emit_store_flag where available. */ temp = expand_binop (word_mode, lshr_optab, op0_low, wordm1, NULL_RTX, 1, methods); if (temp) op0_high = expand_binop (word_mode, add_optab, op0_high, temp, NULL_RTX, 0, OPTAB_DIRECT); else { temp = expand_binop (word_mode, ashr_optab, op0_low, wordm1, NULL_RTX, 0, methods); if (!temp) return NULL_RTX; op0_high = expand_binop (word_mode, sub_optab, op0_high, temp, NULL_RTX, 0, OPTAB_DIRECT); } if (!op0_high) return NULL_RTX; } adjust = expand_binop (word_mode, smul_optab, op0_high, op1_low, NULL_RTX, 0, OPTAB_DIRECT); if (!adjust) return NULL_RTX; /* OP0_HIGH should now be dead. */ if (!umulp) { /* ??? This could be done with emit_store_flag where available. */ temp = expand_binop (word_mode, lshr_optab, op1_low, wordm1, NULL_RTX, 1, methods); if (temp) op1_high = expand_binop (word_mode, add_optab, op1_high, temp, NULL_RTX, 0, OPTAB_DIRECT); else { temp = expand_binop (word_mode, ashr_optab, op1_low, wordm1, NULL_RTX, 0, methods); if (!temp) return NULL_RTX; op1_high = expand_binop (word_mode, sub_optab, op1_high, temp, NULL_RTX, 0, OPTAB_DIRECT); } if (!op1_high) return NULL_RTX; } temp = expand_binop (word_mode, smul_optab, op1_high, op0_low, NULL_RTX, 0, OPTAB_DIRECT); if (!temp) return NULL_RTX; /* OP1_HIGH should now be dead. */ adjust = expand_binop (word_mode, add_optab, adjust, temp, adjust, 0, OPTAB_DIRECT); if (target && !REG_P (target)) target = NULL_RTX; if (umulp) product = expand_binop (mode, umul_widen_optab, op0_low, op1_low, target, 1, OPTAB_DIRECT); else product = expand_binop (mode, smul_widen_optab, op0_low, op1_low, target, 1, OPTAB_DIRECT); if (!product) return NULL_RTX; product_high = operand_subword (product, high, 1, mode); adjust = expand_binop (word_mode, add_optab, product_high, adjust, REG_P (product_high) ? product_high : adjust, 0, OPTAB_DIRECT); emit_move_insn (product_high, adjust); return product; } /* Wrapper around expand_binop which takes an rtx code to specify the operation to perform, not an optab pointer. All other arguments are the same. */ rtx expand_simple_binop (enum machine_mode mode, enum rtx_code code, rtx op0, rtx op1, rtx target, int unsignedp, enum optab_methods methods) { optab binop = code_to_optab[(int) code]; gcc_assert (binop); return expand_binop (mode, binop, op0, op1, target, unsignedp, methods); } /* Return whether OP0 and OP1 should be swapped when expanding a commutative binop. Order them according to commutative_operand_precedence and, if possible, try to put TARGET or a pseudo first. */ static bool swap_commutative_operands_with_target (rtx target, rtx op0, rtx op1) { int op0_prec = commutative_operand_precedence (op0); int op1_prec = commutative_operand_precedence (op1); if (op0_prec < op1_prec) return true; if (op0_prec > op1_prec) return false; /* With equal precedence, both orders are ok, but it is better if the first operand is TARGET, or if both TARGET and OP0 are pseudos. */ if (target == 0 || REG_P (target)) return (REG_P (op1) && !REG_P (op0)) || target == op1; else return rtx_equal_p (op1, target); } /* Generate code to perform an operation specified by BINOPTAB on operands OP0 and OP1, with result having machine-mode MODE. UNSIGNEDP is for the case where we have to widen the operands to perform the operation. It says to use zero-extension. If TARGET is nonzero, the value is generated there, if it is convenient to do so. In all cases an rtx is returned for the locus of the value; this may or may not be TARGET. */ rtx expand_binop (enum machine_mode mode, optab binoptab, rtx op0, rtx op1, rtx target, int unsignedp, enum optab_methods methods) { enum optab_methods next_methods = (methods == OPTAB_LIB || methods == OPTAB_LIB_WIDEN ? OPTAB_WIDEN : methods); enum mode_class class; enum machine_mode wider_mode; rtx temp; int commutative_op = 0; int shift_op = (binoptab->code == ASHIFT || binoptab->code == ASHIFTRT || binoptab->code == LSHIFTRT || binoptab->code == ROTATE || binoptab->code == ROTATERT); rtx entry_last = get_last_insn (); rtx last; bool first_pass_p = true; class = GET_MODE_CLASS (mode); /* If subtracting an integer constant, convert this into an addition of the negated constant. */ if (binoptab == sub_optab && GET_CODE (op1) == CONST_INT) { op1 = negate_rtx (mode, op1); binoptab = add_optab; } /* If we are inside an appropriately-short loop and we are optimizing, force expensive constants into a register. */ if (CONSTANT_P (op0) && optimize && rtx_cost (op0, binoptab->code) > COSTS_N_INSNS (1)) { if (GET_MODE (op0) != VOIDmode) op0 = convert_modes (mode, VOIDmode, op0, unsignedp); op0 = force_reg (mode, op0); } if (CONSTANT_P (op1) && optimize && ! shift_op && rtx_cost (op1, binoptab->code) > COSTS_N_INSNS (1)) { if (GET_MODE (op1) != VOIDmode) op1 = convert_modes (mode, VOIDmode, op1, unsignedp); op1 = force_reg (mode, op1); } /* Record where to delete back to if we backtrack. */ last = get_last_insn (); /* If operation is commutative, try to make the first operand a register. Even better, try to make it the same as the target. Also try to make the last operand a constant. */ if (GET_RTX_CLASS (binoptab->code) == RTX_COMM_ARITH || binoptab == smul_widen_optab || binoptab == umul_widen_optab || binoptab == smul_highpart_optab || binoptab == umul_highpart_optab) { commutative_op = 1; if (swap_commutative_operands_with_target (target, op0, op1)) { temp = op1; op1 = op0; op0 = temp; } } retry: /* If we can do it with a three-operand insn, do so. */ if (methods != OPTAB_MUST_WIDEN && binoptab->handlers[(int) mode].insn_code != CODE_FOR_nothing) { int icode = (int) binoptab->handlers[(int) mode].insn_code; enum machine_mode mode0 = insn_data[icode].operand[1].mode; enum machine_mode mode1 = insn_data[icode].operand[2].mode; rtx pat; rtx xop0 = op0, xop1 = op1; if (target) temp = target; else temp = gen_reg_rtx (mode); /* If it is a commutative operator and the modes would match if we would swap the operands, we can save the conversions. */ if (commutative_op) { if (GET_MODE (op0) != mode0 && GET_MODE (op1) != mode1 && GET_MODE (op0) == mode1 && GET_MODE (op1) == mode0) { rtx tmp; tmp = op0; op0 = op1; op1 = tmp; tmp = xop0; xop0 = xop1; xop1 = tmp; } } /* In case the insn wants input operands in modes different from those of the actual operands, convert the operands. It would seem that we don't need to convert CONST_INTs, but we do, so that they're properly zero-extended, sign-extended or truncated for their mode. */ if (GET_MODE (op0) != mode0 && mode0 != VOIDmode) xop0 = convert_modes (mode0, GET_MODE (op0) != VOIDmode ? GET_MODE (op0) : mode, xop0, unsignedp); if (GET_MODE (op1) != mode1 && mode1 != VOIDmode) xop1 = convert_modes (mode1, GET_MODE (op1) != VOIDmode ? GET_MODE (op1) : mode, xop1, unsignedp); /* Now, if insn's predicates don't allow our operands, put them into pseudo regs. */ if (!insn_data[icode].operand[1].predicate (xop0, mode0) && mode0 != VOIDmode) xop0 = copy_to_mode_reg (mode0, xop0); if (!insn_data[icode].operand[2].predicate (xop1, mode1) && mode1 != VOIDmode) xop1 = copy_to_mode_reg (mode1, xop1); if (!insn_data[icode].operand[0].predicate (temp, mode)) temp = gen_reg_rtx (mode); pat = GEN_FCN (icode) (temp, xop0, xop1); if (pat) { /* If PAT is composed of more than one insn, try to add an appropriate REG_EQUAL note to it. If we can't because TEMP conflicts with an operand, call ourselves again, this time without a target. */ if (INSN_P (pat) && NEXT_INSN (pat) != NULL_RTX && ! add_equal_note (pat, temp, binoptab->code, xop0, xop1)) { delete_insns_since (last); return expand_binop (mode, binoptab, op0, op1, NULL_RTX, unsignedp, methods); } emit_insn (pat); return temp; } else delete_insns_since (last); } /* If we were trying to rotate by a constant value, and that didn't work, try rotating the other direction before falling back to shifts and bitwise-or. */ if (first_pass_p && (binoptab == rotl_optab || binoptab == rotr_optab) && class == MODE_INT && GET_CODE (op1) == CONST_INT && INTVAL (op1) > 0 && (unsigned int) INTVAL (op1) < GET_MODE_BITSIZE (mode)) { first_pass_p = false; op1 = GEN_INT (GET_MODE_BITSIZE (mode) - INTVAL (op1)); binoptab = binoptab == rotl_optab ? rotr_optab : rotl_optab; goto retry; } /* If this is a multiply, see if we can do a widening operation that takes operands of this mode and makes a wider mode. */ if (binoptab == smul_optab && GET_MODE_WIDER_MODE (mode) != VOIDmode && (((unsignedp ? umul_widen_optab : smul_widen_optab) ->handlers[(int) GET_MODE_WIDER_MODE (mode)].insn_code) != CODE_FOR_nothing)) { temp = expand_binop (GET_MODE_WIDER_MODE (mode), unsignedp ? umul_widen_optab : smul_widen_optab, op0, op1, NULL_RTX, unsignedp, OPTAB_DIRECT); if (temp != 0) { if (GET_MODE_CLASS (mode) == MODE_INT && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode), GET_MODE_BITSIZE (GET_MODE (temp)))) return gen_lowpart (mode, temp); else return convert_to_mode (mode, temp, unsignedp); } } /* Look for a wider mode of the same class for which we think we can open-code the operation. Check for a widening multiply at the wider mode as well. */ if (CLASS_HAS_WIDER_MODES_P (class) && methods != OPTAB_DIRECT && methods != OPTAB_LIB) for (wider_mode = GET_MODE_WIDER_MODE (mode); wider_mode != VOIDmode; wider_mode = GET_MODE_WIDER_MODE (wider_mode)) { if (binoptab->handlers[(int) wider_mode].insn_code != CODE_FOR_nothing || (binoptab == smul_optab && GET_MODE_WIDER_MODE (wider_mode) != VOIDmode && (((unsignedp ? umul_widen_optab : smul_widen_optab) ->handlers[(int) GET_MODE_WIDER_MODE (wider_mode)].insn_code) != CODE_FOR_nothing))) { rtx xop0 = op0, xop1 = op1; int no_extend = 0; /* For certain integer operations, we need not actually extend the narrow operands, as long as we will truncate the results to the same narrowness. */ if ((binoptab == ior_optab || binoptab == and_optab || binoptab == xor_optab || binoptab == add_optab || binoptab == sub_optab || binoptab == smul_optab || binoptab == ashl_optab) && class == MODE_INT) no_extend = 1; xop0 = widen_operand (xop0, wider_mode, mode, unsignedp, no_extend); /* The second operand of a shift must always be extended. */ xop1 = widen_operand (xop1, wider_mode, mode, unsignedp, no_extend && binoptab != ashl_optab); temp = expand_binop (wider_mode, binoptab, xop0, xop1, NULL_RTX, unsignedp, OPTAB_DIRECT); if (temp) { if (class != MODE_INT || !TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode), GET_MODE_BITSIZE (wider_mode))) { if (target == 0) target = gen_reg_rtx (mode); convert_move (target, temp, 0); return target; } else return gen_lowpart (mode, temp); } else delete_insns_since (last); } } /* These can be done a word at a time. */ if ((binoptab == and_optab || binoptab == ior_optab || binoptab == xor_optab) && class == MODE_INT && GET_MODE_SIZE (mode) > UNITS_PER_WORD && binoptab->handlers[(int) word_mode].insn_code != CODE_FOR_nothing) { int i; rtx insns; rtx equiv_value; /* If TARGET is the same as one of the operands, the REG_EQUAL note won't be accurate, so use a new target. */ if (target == 0 || target == op0 || target == op1) target = gen_reg_rtx (mode); start_sequence (); /* Do the actual arithmetic. */ for (i = 0; i < GET_MODE_BITSIZE (mode) / BITS_PER_WORD; i++) { rtx target_piece = operand_subword (target, i, 1, mode); rtx x = expand_binop (word_mode, binoptab, operand_subword_force (op0, i, mode), operand_subword_force (op1, i, mode), target_piece, unsignedp, next_methods); if (x == 0) break; if (target_piece != x) emit_move_insn (target_piece, x); } insns = get_insns (); end_sequence (); if (i == GET_MODE_BITSIZE (mode) / BITS_PER_WORD) { if (binoptab->code != UNKNOWN) equiv_value = gen_rtx_fmt_ee (binoptab->code, mode, copy_rtx (op0), copy_rtx (op1)); else equiv_value = 0; emit_no_conflict_block (insns, target, op0, op1, equiv_value); return target; } } /* Synthesize double word shifts from single word shifts. */ if ((binoptab == lshr_optab || binoptab == ashl_optab || binoptab == ashr_optab) && class == MODE_INT && (GET_CODE (op1) == CONST_INT || !optimize_size) && GET_MODE_SIZE (mode) == 2 * UNITS_PER_WORD && binoptab->handlers[(int) word_mode].insn_code != CODE_FOR_nothing && ashl_optab->handlers[(int) word_mode].insn_code != CODE_FOR_nothing && lshr_optab->handlers[(int) word_mode].insn_code != CODE_FOR_nothing) { unsigned HOST_WIDE_INT shift_mask, double_shift_mask; enum machine_mode op1_mode; double_shift_mask = targetm.shift_truncation_mask (mode); shift_mask = targetm.shift_truncation_mask (word_mode); op1_mode = GET_MODE (op1) != VOIDmode ? GET_MODE (op1) : word_mode; /* Apply the truncation to constant shifts. */ if (double_shift_mask > 0 && GET_CODE (op1) == CONST_INT) op1 = GEN_INT (INTVAL (op1) & double_shift_mask); if (op1 == CONST0_RTX (op1_mode)) return op0; /* Make sure that this is a combination that expand_doubleword_shift can handle. See the comments there for details. */ if (double_shift_mask == 0 || (shift_mask == BITS_PER_WORD - 1 && double_shift_mask == BITS_PER_WORD * 2 - 1)) { rtx insns, equiv_value; rtx into_target, outof_target; rtx into_input, outof_input; int left_shift, outof_word; /* If TARGET is the same as one of the operands, the REG_EQUAL note won't be accurate, so use a new target. */ if (target == 0 || target == op0 || target == op1) target = gen_reg_rtx (mode); start_sequence (); /* OUTOF_* is the word we are shifting bits away from, and INTO_* is the word that we are shifting bits towards, thus they differ depending on the direction of the shift and WORDS_BIG_ENDIAN. */ left_shift = binoptab == ashl_optab; outof_word = left_shift ^ ! WORDS_BIG_ENDIAN; outof_target = operand_subword (target, outof_word, 1, mode); into_target = operand_subword (target, 1 - outof_word, 1, mode); outof_input = operand_subword_force (op0, outof_word, mode); into_input = operand_subword_force (op0, 1 - outof_word, mode); if (expand_doubleword_shift (op1_mode, binoptab, outof_input, into_input, op1, outof_target, into_target, unsignedp, next_methods, shift_mask)) { insns = get_insns (); end_sequence (); equiv_value = gen_rtx_fmt_ee (binoptab->code, mode, op0, op1); emit_no_conflict_block (insns, target, op0, op1, equiv_value); return target; } end_sequence (); } } /* Synthesize double word rotates from single word shifts. */ if ((binoptab == rotl_optab || binoptab == rotr_optab) && class == MODE_INT && GET_CODE (op1) == CONST_INT && GET_MODE_SIZE (mode) == 2 * UNITS_PER_WORD && ashl_optab->handlers[(int) word_mode].insn_code != CODE_FOR_nothing && lshr_optab->handlers[(int) word_mode].insn_code != CODE_FOR_nothing) { rtx insns; rtx into_target, outof_target; rtx into_input, outof_input; rtx inter; int shift_count, left_shift, outof_word; /* If TARGET is the same as one of the operands, the REG_EQUAL note won't be accurate, so use a new target. Do this also if target is not a REG, first because having a register instead may open optimization opportunities, and second because if target and op0 happen to be MEMs designating the same location, we would risk clobbering it too early in the code sequence we generate below. */ if (target == 0 || target == op0 || target == op1 || ! REG_P (target)) target = gen_reg_rtx (mode); start_sequence (); shift_count = INTVAL (op1); /* OUTOF_* is the word we are shifting bits away from, and INTO_* is the word that we are shifting bits towards, thus they differ depending on the direction of the shift and WORDS_BIG_ENDIAN. */ left_shift = (binoptab == rotl_optab); outof_word = left_shift ^ ! WORDS_BIG_ENDIAN; outof_target = operand_subword (target, outof_word, 1, mode); into_target = operand_subword (target, 1 - outof_word, 1, mode); outof_input = operand_subword_force (op0, outof_word, mode); into_input = operand_subword_force (op0, 1 - outof_word, mode); if (shift_count == BITS_PER_WORD) { /* This is just a word swap. */ emit_move_insn (outof_target, into_input); emit_move_insn (into_target, outof_input); inter = const0_rtx; } else { rtx into_temp1, into_temp2, outof_temp1, outof_temp2; rtx first_shift_count, second_shift_count; optab reverse_unsigned_shift, unsigned_shift; reverse_unsigned_shift = (left_shift ^ (shift_count < BITS_PER_WORD) ? lshr_optab : ashl_optab); unsigned_shift = (left_shift ^ (shift_count < BITS_PER_WORD) ? ashl_optab : lshr_optab); if (shift_count > BITS_PER_WORD) { first_shift_count = GEN_INT (shift_count - BITS_PER_WORD); second_shift_count = GEN_INT (2 * BITS_PER_WORD - shift_count); } else { first_shift_count = GEN_INT (BITS_PER_WORD - shift_count); second_shift_count = GEN_INT (shift_count); } into_temp1 = expand_binop (word_mode, unsigned_shift, outof_input, first_shift_count, NULL_RTX, unsignedp, next_methods); into_temp2 = expand_binop (word_mode, reverse_unsigned_shift, into_input, second_shift_count, NULL_RTX, unsignedp, next_methods); if (into_temp1 != 0 && into_temp2 != 0) inter = expand_binop (word_mode, ior_optab, into_temp1, into_temp2, into_target, unsignedp, next_methods); else inter = 0; if (inter != 0 && inter != into_target) emit_move_insn (into_target, inter); outof_temp1 = expand_binop (word_mode, unsigned_shift, into_input, first_shift_count, NULL_RTX, unsignedp, next_methods); outof_temp2 = expand_binop (word_mode, reverse_unsigned_shift, outof_input, second_shift_count, NULL_RTX, unsignedp, next_methods); if (inter != 0 && outof_temp1 != 0 && outof_temp2 != 0) inter = expand_binop (word_mode, ior_optab, outof_temp1, outof_temp2, outof_target, unsignedp, next_methods); if (inter != 0 && inter != outof_target) emit_move_insn (outof_target, inter); } insns = get_insns (); end_sequence (); if (inter != 0) { /* One may be tempted to wrap the insns in a REG_NO_CONFLICT block to help the register allocator a bit. But a multi-word rotate will need all the input bits when setting the output bits, so there clearly is a conflict between the input and output registers. So we can't use a no-conflict block here. */ emit_insn (insns); return target; } } /* These can be done a word at a time by propagating carries. */ if ((binoptab == add_optab || binoptab == sub_optab) && class == MODE_INT && GET_MODE_SIZE (mode) >= 2 * UNITS_PER_WORD && binoptab->handlers[(int) word_mode].insn_code != CODE_FOR_nothing) { unsigned int i; optab otheroptab = binoptab == add_optab ? sub_optab : add_optab; const unsigned int nwords = GET_MODE_BITSIZE (mode) / BITS_PER_WORD; rtx carry_in = NULL_RTX, carry_out = NULL_RTX; rtx xop0, xop1, xtarget; /* We can handle either a 1 or -1 value for the carry. If STORE_FLAG value is one of those, use it. Otherwise, use 1 since it is the one easiest to get. */ #if STORE_FLAG_VALUE == 1 || STORE_FLAG_VALUE == -1 int normalizep = STORE_FLAG_VALUE; #else int normalizep = 1; #endif /* Prepare the operands. */ xop0 = force_reg (mode, op0); xop1 = force_reg (mode, op1); xtarget = gen_reg_rtx (mode); if (target == 0 || !REG_P (target)) target = xtarget; /* Indicate for flow that the entire target reg is being set. */ if (REG_P (target)) emit_insn (gen_rtx_CLOBBER (VOIDmode, xtarget)); /* Do the actual arithmetic. */ for (i = 0; i < nwords; i++) { int index = (WORDS_BIG_ENDIAN ? nwords - i - 1 : i); rtx target_piece = operand_subword (xtarget, index, 1, mode); rtx op0_piece = operand_subword_force (xop0, index, mode); rtx op1_piece = operand_subword_force (xop1, index, mode); rtx x; /* Main add/subtract of the input operands. */ x = expand_binop (word_mode, binoptab, op0_piece, op1_piece, target_piece, unsignedp, next_methods); if (x == 0) break; if (i + 1 < nwords) { /* Store carry from main add/subtract. */ carry_out = gen_reg_rtx (word_mode); carry_out = emit_store_flag_force (carry_out, (binoptab == add_optab ? LT : GT), x, op0_piece, word_mode, 1, normalizep); } if (i > 0) { rtx newx; /* Add/subtract previous carry to main result. */ newx = expand_binop (word_mode, normalizep == 1 ? binoptab : otheroptab, x, carry_in, NULL_RTX, 1, next_methods); if (i + 1 < nwords) { /* Get out carry from adding/subtracting carry in. */ rtx carry_tmp = gen_reg_rtx (word_mode); carry_tmp = emit_store_flag_force (carry_tmp, (binoptab == add_optab ? LT : GT), newx, x, word_mode, 1, normalizep); /* Logical-ior the two poss. carry together. */ carry_out = expand_binop (word_mode, ior_optab, carry_out, carry_tmp, carry_out, 0, next_methods); if (carry_out == 0) break; } emit_move_insn (target_piece, newx); } else { if (x != target_piece) emit_move_insn (target_piece, x); } carry_in = carry_out; } if (i == GET_MODE_BITSIZE (mode) / (unsigned) BITS_PER_WORD) { if (mov_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing || ! rtx_equal_p (target, xtarget)) { rtx temp = emit_move_insn (target, xtarget); set_unique_reg_note (temp, REG_EQUAL, gen_rtx_fmt_ee (binoptab->code, mode, copy_rtx (xop0), copy_rtx (xop1))); } else target = xtarget; return target; } else delete_insns_since (last); } /* Attempt to synthesize double word multiplies using a sequence of word mode multiplications. We first attempt to generate a sequence using a more efficient unsigned widening multiply, and if that fails we then try using a signed widening multiply. */ if (binoptab == smul_optab && class == MODE_INT && GET_MODE_SIZE (mode) == 2 * UNITS_PER_WORD && smul_optab->handlers[(int) word_mode].insn_code != CODE_FOR_nothing && add_optab->handlers[(int) word_mode].insn_code != CODE_FOR_nothing) { rtx product = NULL_RTX; if (umul_widen_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing) { product = expand_doubleword_mult (mode, op0, op1, target, true, methods); if (!product) delete_insns_since (last); } if (product == NULL_RTX && smul_widen_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing) { product = expand_doubleword_mult (mode, op0, op1, target, false, methods); if (!product) delete_insns_since (last); } if (product != NULL_RTX) { if (mov_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing) { temp = emit_move_insn (target ? target : product, product); set_unique_reg_note (temp, REG_EQUAL, gen_rtx_fmt_ee (MULT, mode, copy_rtx (op0), copy_rtx (op1))); } return product; } } /* It can't be open-coded in this mode. Use a library call if one is available and caller says that's ok. */ if (binoptab->handlers[(int) mode].libfunc && (methods == OPTAB_LIB || methods == OPTAB_LIB_WIDEN)) { rtx insns; rtx op1x = op1; enum machine_mode op1_mode = mode; rtx value; start_sequence (); if (shift_op) { op1_mode = word_mode; /* Specify unsigned here, since negative shift counts are meaningless. */ op1x = convert_to_mode (word_mode, op1, 1); } if (GET_MODE (op0) != VOIDmode && GET_MODE (op0) != mode) op0 = convert_to_mode (mode, op0, unsignedp); /* Pass 1 for NO_QUEUE so we don't lose any increments if the libcall is cse'd or moved. */ value = emit_library_call_value (binoptab->handlers[(int) mode].libfunc, NULL_RTX, LCT_CONST, mode, 2, op0, mode, op1x, op1_mode); insns = get_insns (); end_sequence (); target = gen_reg_rtx (mode); emit_libcall_block (insns, target, value, gen_rtx_fmt_ee (binoptab->code, mode, op0, op1)); return target; } delete_insns_since (last); /* It can't be done in this mode. Can we do it in a wider mode? */ if (! (methods == OPTAB_WIDEN || methods == OPTAB_LIB_WIDEN || methods == OPTAB_MUST_WIDEN)) { /* Caller says, don't even try. */ delete_insns_since (entry_last); return 0; } /* Compute the value of METHODS to pass to recursive calls. Don't allow widening to be tried recursively. */ methods = (methods == OPTAB_LIB_WIDEN ? OPTAB_LIB : OPTAB_DIRECT); /* Look for a wider mode of the same class for which it appears we can do the operation. */ if (CLASS_HAS_WIDER_MODES_P (class)) { for (wider_mode = GET_MODE_WIDER_MODE (mode); wider_mode != VOIDmode; wider_mode = GET_MODE_WIDER_MODE (wider_mode)) { if ((binoptab->handlers[(int) wider_mode].insn_code != CODE_FOR_nothing) || (methods == OPTAB_LIB && binoptab->handlers[(int) wider_mode].libfunc)) { rtx xop0 = op0, xop1 = op1; int no_extend = 0; /* For certain integer operations, we need not actually extend the narrow operands, as long as we will truncate the results to the same narrowness. */ if ((binoptab == ior_optab || binoptab == and_optab || binoptab == xor_optab || binoptab == add_optab || binoptab == sub_optab || binoptab == smul_optab || binoptab == ashl_optab) && class == MODE_INT) no_extend = 1; xop0 = widen_operand (xop0, wider_mode, mode, unsignedp, no_extend); /* The second operand of a shift must always be extended. */ xop1 = widen_operand (xop1, wider_mode, mode, unsignedp, no_extend && binoptab != ashl_optab); temp = expand_binop (wider_mode, binoptab, xop0, xop1, NULL_RTX, unsignedp, methods); if (temp) { if (class != MODE_INT || !TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode), GET_MODE_BITSIZE (wider_mode))) { if (target == 0) target = gen_reg_rtx (mode); convert_move (target, temp, 0); return target; } else return gen_lowpart (mode, temp); } else delete_insns_since (last); } } } delete_insns_since (entry_last); return 0; } /* Expand a binary operator which has both signed and unsigned forms. UOPTAB is the optab for unsigned operations, and SOPTAB is for signed operations. If we widen unsigned operands, we may use a signed wider operation instead of an unsigned wider operation, since the result would be the same. */ rtx sign_expand_binop (enum machine_mode mode, optab uoptab, optab soptab, rtx op0, rtx op1, rtx target, int unsignedp, enum optab_methods methods) { rtx temp; optab direct_optab = unsignedp ? uoptab : soptab; struct optab wide_soptab; /* Do it without widening, if possible. */ temp = expand_binop (mode, direct_optab, op0, op1, target, unsignedp, OPTAB_DIRECT); if (temp || methods == OPTAB_DIRECT) return temp; /* Try widening to a signed int. Make a fake signed optab that hides any signed insn for direct use. */ wide_soptab = *soptab; wide_soptab.handlers[(int) mode].insn_code = CODE_FOR_nothing; wide_soptab.handlers[(int) mode].libfunc = 0; temp = expand_binop (mode, &wide_soptab, op0, op1, target, unsignedp, OPTAB_WIDEN); /* For unsigned operands, try widening to an unsigned int. */ if (temp == 0 && unsignedp) temp = expand_binop (mode, uoptab, op0, op1, target, unsignedp, OPTAB_WIDEN); if (temp || methods == OPTAB_WIDEN) return temp; /* Use the right width lib call if that exists. */ temp = expand_binop (mode, direct_optab, op0, op1, target, unsignedp, OPTAB_LIB); if (temp || methods == OPTAB_LIB) return temp; /* Must widen and use a lib call, use either signed or unsigned. */ temp = expand_binop (mode, &wide_soptab, op0, op1, target, unsignedp, methods); if (temp != 0) return temp; if (unsignedp) return expand_binop (mode, uoptab, op0, op1, target, unsignedp, methods); return 0; } /* Generate code to perform an operation specified by UNOPPTAB on operand OP0, with two results to TARG0 and TARG1. We assume that the order of the operands for the instruction is TARG0, TARG1, OP0. Either TARG0 or TARG1 may be zero, but what that means is that the result is not actually wanted. We will generate it into a dummy pseudo-reg and discard it. They may not both be zero. Returns 1 if this operation can be performed; 0 if not. */ int expand_twoval_unop (optab unoptab, rtx op0, rtx targ0, rtx targ1, int unsignedp) { enum machine_mode mode = GET_MODE (targ0 ? targ0 : targ1); enum mode_class class; enum machine_mode wider_mode; rtx entry_last = get_last_insn (); rtx last; class = GET_MODE_CLASS (mode); if (!targ0) targ0 = gen_reg_rtx (mode); if (!targ1) targ1 = gen_reg_rtx (mode); /* Record where to go back to if we fail. */ last = get_last_insn (); if (unoptab->handlers[(int) mode].insn_code != CODE_FOR_nothing) { int icode = (int) unoptab->handlers[(int) mode].insn_code; enum machine_mode mode0 = insn_data[icode].operand[2].mode; rtx pat; rtx xop0 = op0; if (GET_MODE (xop0) != VOIDmode && GET_MODE (xop0) != mode0) xop0 = convert_to_mode (mode0, xop0, unsignedp); /* Now, if insn doesn't accept these operands, put them into pseudos. */ if (!insn_data[icode].operand[2].predicate (xop0, mode0)) xop0 = copy_to_mode_reg (mode0, xop0); /* We could handle this, but we should always be called with a pseudo for our targets and all insns should take them as outputs. */ gcc_assert (insn_data[icode].operand[0].predicate (targ0, mode)); gcc_assert (insn_data[icode].operand[1].predicate (targ1, mode)); pat = GEN_FCN (icode) (targ0, targ1, xop0); if (pat) { emit_insn (pat); return 1; } else delete_insns_since (last); } /* It can't be done in this mode. Can we do it in a wider mode? */ if (CLASS_HAS_WIDER_MODES_P (class)) { for (wider_mode = GET_MODE_WIDER_MODE (mode); wider_mode != VOIDmode; wider_mode = GET_MODE_WIDER_MODE (wider_mode)) { if (unoptab->handlers[(int) wider_mode].insn_code != CODE_FOR_nothing) { rtx t0 = gen_reg_rtx (wider_mode); rtx t1 = gen_reg_rtx (wider_mode); rtx cop0 = convert_modes (wider_mode, mode, op0, unsignedp); if (expand_twoval_unop (unoptab, cop0, t0, t1, unsignedp)) { convert_move (targ0, t0, unsignedp); convert_move (targ1, t1, unsignedp); return 1; } else delete_insns_since (last); } } } delete_insns_since (entry_last); return 0; } /* Generate code to perform an operation specified by BINOPTAB on operands OP0 and OP1, with two results to TARG1 and TARG2. We assume that the order of the operands for the instruction is TARG0, OP0, OP1, TARG1, which would fit a pattern like [(set TARG0 (operate OP0 OP1)) (set TARG1 (operate ...))]. Either TARG0 or TARG1 may be zero, but what that means is that the result is not actually wanted. We will generate it into a dummy pseudo-reg and discard it. They may not both be zero. Returns 1 if this operation can be performed; 0 if not. */ int expand_twoval_binop (optab binoptab, rtx op0, rtx op1, rtx targ0, rtx targ1, int unsignedp) { enum machine_mode mode = GET_MODE (targ0 ? targ0 : targ1); enum mode_class class; enum machine_mode wider_mode; rtx entry_last = get_last_insn (); rtx last; class = GET_MODE_CLASS (mode); /* If we are inside an appropriately-short loop and we are optimizing, force expensive constants into a register. */ if (CONSTANT_P (op0) && optimize && rtx_cost (op0, binoptab->code) > COSTS_N_INSNS (1)) op0 = force_reg (mode, op0); if (CONSTANT_P (op1) && optimize && rtx_cost (op1, binoptab->code) > COSTS_N_INSNS (1)) op1 = force_reg (mode, op1); if (!targ0) targ0 = gen_reg_rtx (mode); if (!targ1) targ1 = gen_reg_rtx (mode); /* Record where to go back to if we fail. */ last = get_last_insn (); if (binoptab->handlers[(int) mode].insn_code != CODE_FOR_nothing) { int icode = (int) binoptab->handlers[(int) mode].insn_code; enum machine_mode mode0 = insn_data[icode].operand[1].mode; enum machine_mode mode1 = insn_data[icode].operand[2].mode; rtx pat; rtx xop0 = op0, xop1 = op1; /* In case the insn wants input operands in modes different from those of the actual operands, convert the operands. It would seem that we don't need to convert CONST_INTs, but we do, so that they're properly zero-extended, sign-extended or truncated for their mode. */ if (GET_MODE (op0) != mode0 && mode0 != VOIDmode) xop0 = convert_modes (mode0, GET_MODE (op0) != VOIDmode ? GET_MODE (op0) : mode, xop0, unsignedp); if (GET_MODE (op1) != mode1 && mode1 != VOIDmode) xop1 = convert_modes (mode1, GET_MODE (op1) != VOIDmode ? GET_MODE (op1) : mode, xop1, unsignedp); /* Now, if insn doesn't accept these operands, put them into pseudos. */ if (!insn_data[icode].operand[1].predicate (xop0, mode0)) xop0 = copy_to_mode_reg (mode0, xop0); if (!insn_data[icode].operand[2].predicate (xop1, mode1)) xop1 = copy_to_mode_reg (mode1, xop1); /* We could handle this, but we should always be called with a pseudo for our targets and all insns should take them as outputs. */ gcc_assert (insn_data[icode].operand[0].predicate (targ0, mode)); gcc_assert (insn_data[icode].operand[3].predicate (targ1, mode)); pat = GEN_FCN (icode) (targ0, xop0, xop1, targ1); if (pat) { emit_insn (pat); return 1; } else delete_insns_since (last); } /* It can't be done in this mode. Can we do it in a wider mode? */ if (CLASS_HAS_WIDER_MODES_P (class)) { for (wider_mode = GET_MODE_WIDER_MODE (mode); wider_mode != VOIDmode; wider_mode = GET_MODE_WIDER_MODE (wider_mode)) { if (binoptab->handlers[(int) wider_mode].insn_code != CODE_FOR_nothing) { rtx t0 = gen_reg_rtx (wider_mode); rtx t1 = gen_reg_rtx (wider_mode); rtx cop0 = convert_modes (wider_mode, mode, op0, unsignedp); rtx cop1 = convert_modes (wider_mode, mode, op1, unsignedp); if (expand_twoval_binop (binoptab, cop0, cop1, t0, t1, unsignedp)) { convert_move (targ0, t0, unsignedp); convert_move (targ1, t1, unsignedp); return 1; } else delete_insns_since (last); } } } delete_insns_since (entry_last); return 0; } /* Expand the two-valued library call indicated by BINOPTAB, but preserve only one of the values. If TARG0 is non-NULL, the first value is placed into TARG0; otherwise the second value is placed into TARG1. Exactly one of TARG0 and TARG1 must be non-NULL. The value stored into TARG0 or TARG1 is equivalent to (CODE OP0 OP1). This routine assumes that the value returned by the library call is as if the return value was of an integral mode twice as wide as the mode of OP0. Returns 1 if the call was successful. */ bool expand_twoval_binop_libfunc (optab binoptab, rtx op0, rtx op1, rtx targ0, rtx targ1, enum rtx_code code) { enum machine_mode mode; enum machine_mode libval_mode; rtx libval; rtx insns; /* Exactly one of TARG0 or TARG1 should be non-NULL. */ gcc_assert (!targ0 != !targ1); mode = GET_MODE (op0); if (!binoptab->handlers[(int) mode].libfunc) return false; /* The value returned by the library function will have twice as many bits as the nominal MODE. */ libval_mode = smallest_mode_for_size (2 * GET_MODE_BITSIZE (mode), MODE_INT); start_sequence (); libval = emit_library_call_value (binoptab->handlers[(int) mode].libfunc, NULL_RTX, LCT_CONST, libval_mode, 2, op0, mode, op1, mode); /* Get the part of VAL containing the value that we want. */ libval = simplify_gen_subreg (mode, libval, libval_mode, targ0 ? 0 : GET_MODE_SIZE (mode)); insns = get_insns (); end_sequence (); /* Move the into the desired location. */ emit_libcall_block (insns, targ0 ? targ0 : targ1, libval, gen_rtx_fmt_ee (code, mode, op0, op1)); return true; } /* Wrapper around expand_unop which takes an rtx code to specify the operation to perform, not an optab pointer. All other arguments are the same. */ rtx expand_simple_unop (enum machine_mode mode, enum rtx_code code, rtx op0, rtx target, int unsignedp) { optab unop = code_to_optab[(int) code]; gcc_assert (unop); return expand_unop (mode, unop, op0, target, unsignedp); } /* Try calculating (clz:narrow x) as (clz:wide (zero_extend:wide x)) - ((width wide) - (width narrow)). */ static rtx widen_clz (enum machine_mode mode, rtx op0, rtx target) { enum mode_class class = GET_MODE_CLASS (mode); if (CLASS_HAS_WIDER_MODES_P (class)) { enum machine_mode wider_mode; for (wider_mode = GET_MODE_WIDER_MODE (mode); wider_mode != VOIDmode; wider_mode = GET_MODE_WIDER_MODE (wider_mode)) { if (clz_optab->handlers[(int) wider_mode].insn_code != CODE_FOR_nothing) { rtx xop0, temp, last; last = get_last_insn (); if (target == 0) target = gen_reg_rtx (mode); xop0 = widen_operand (op0, wider_mode, mode, true, false); temp = expand_unop (wider_mode, clz_optab, xop0, NULL_RTX, true); if (temp != 0) temp = expand_binop (wider_mode, sub_optab, temp, GEN_INT (GET_MODE_BITSIZE (wider_mode) - GET_MODE_BITSIZE (mode)), target, true, OPTAB_DIRECT); if (temp == 0) delete_insns_since (last); return temp; } } } return 0; } /* Try calculating (parity x) as (and (popcount x) 1), where popcount can also be done in a wider mode. */ static rtx expand_parity (enum machine_mode mode, rtx op0, rtx target) { enum mode_class class = GET_MODE_CLASS (mode); if (CLASS_HAS_WIDER_MODES_P (class)) { enum machine_mode wider_mode; for (wider_mode = mode; wider_mode != VOIDmode; wider_mode = GET_MODE_WIDER_MODE (wider_mode)) { if (popcount_optab->handlers[(int) wider_mode].insn_code != CODE_FOR_nothing) { rtx xop0, temp, last; last = get_last_insn (); if (target == 0) target = gen_reg_rtx (mode); xop0 = widen_operand (op0, wider_mode, mode, true, false); temp = expand_unop (wider_mode, popcount_optab, xop0, NULL_RTX, true); if (temp != 0) temp = expand_binop (wider_mode, and_optab, temp, const1_rtx, target, true, OPTAB_DIRECT); if (temp == 0) delete_insns_since (last); return temp; } } } return 0; } /* Extract the OMODE lowpart from VAL, which has IMODE. Under certain conditions, VAL may already be a SUBREG against which we cannot generate a further SUBREG. In this case, we expect forcing the value into a register will work around the situation. */ static rtx lowpart_subreg_maybe_copy (enum machine_mode omode, rtx val, enum machine_mode imode) { rtx ret; ret = lowpart_subreg (omode, val, imode); if (ret == NULL) { val = force_reg (imode, val); ret = lowpart_subreg (omode, val, imode); gcc_assert (ret != NULL); } return ret; } /* Expand a floating point absolute value or negation operation via a logical operation on the sign bit. */ static rtx expand_absneg_bit (enum rtx_code code, enum machine_mode mode, rtx op0, rtx target) { const struct real_format *fmt; int bitpos, word, nwords, i; enum machine_mode imode; HOST_WIDE_INT hi, lo; rtx temp, insns; /* The format has to have a simple sign bit. */ fmt = REAL_MODE_FORMAT (mode); if (fmt == NULL) return NULL_RTX; bitpos = fmt->signbit_rw; if (bitpos < 0) return NULL_RTX; /* Don't create negative zeros if the format doesn't support them. */ if (code == NEG && !fmt->has_signed_zero) return NULL_RTX; if (GET_MODE_SIZE (mode) <= UNITS_PER_WORD) { imode = int_mode_for_mode (mode); if (imode == BLKmode) return NULL_RTX; word = 0; nwords = 1; } else { imode = word_mode; if (FLOAT_WORDS_BIG_ENDIAN) word = (GET_MODE_BITSIZE (mode) - bitpos) / BITS_PER_WORD; else word = bitpos / BITS_PER_WORD; bitpos = bitpos % BITS_PER_WORD; nwords = (GET_MODE_BITSIZE (mode) + BITS_PER_WORD - 1) / BITS_PER_WORD; } if (bitpos < HOST_BITS_PER_WIDE_INT) { hi = 0; lo = (HOST_WIDE_INT) 1 << bitpos; } else { hi = (HOST_WIDE_INT) 1 << (bitpos - HOST_BITS_PER_WIDE_INT); lo = 0; } if (code == ABS) lo = ~lo, hi = ~hi; if (target == 0 || target == op0) target = gen_reg_rtx (mode); if (nwords > 1) { start_sequence (); for (i = 0; i < nwords; ++i) { rtx targ_piece = operand_subword (target, i, 1, mode); rtx op0_piece = operand_subword_force (op0, i, mode); if (i == word) { temp = expand_binop (imode, code == ABS ? and_optab : xor_optab, op0_piece, immed_double_const (lo, hi, imode), targ_piece, 1, OPTAB_LIB_WIDEN); if (temp != targ_piece) emit_move_insn (targ_piece, temp); } else emit_move_insn (targ_piece, op0_piece); } insns = get_insns (); end_sequence (); temp = gen_rtx_fmt_e (code, mode, copy_rtx (op0)); emit_no_conflict_block (insns, target, op0, NULL_RTX, temp); } else { temp = expand_binop (imode, code == ABS ? and_optab : xor_optab, gen_lowpart (imode, op0), immed_double_const (lo, hi, imode), gen_lowpart (imode, target), 1, OPTAB_LIB_WIDEN); target = lowpart_subreg_maybe_copy (mode, temp, imode); set_unique_reg_note (get_last_insn (), REG_EQUAL, gen_rtx_fmt_e (code, mode, copy_rtx (op0))); } return target; } /* Generate code to perform an operation specified by UNOPTAB on operand OP0, with result having machine-mode MODE. UNSIGNEDP is for the case where we have to widen the operands to perform the operation. It says to use zero-extension. If TARGET is nonzero, the value is generated there, if it is convenient to do so. In all cases an rtx is returned for the locus of the value; this may or may not be TARGET. */ rtx expand_unop (enum machine_mode mode, optab unoptab, rtx op0, rtx target, int unsignedp) { enum mode_class class; enum machine_mode wider_mode; rtx temp; rtx last = get_last_insn (); rtx pat; class = GET_MODE_CLASS (mode); if (unoptab->handlers[(int) mode].insn_code != CODE_FOR_nothing) { int icode = (int) unoptab->handlers[(int) mode].insn_code; enum machine_mode mode0 = insn_data[icode].operand[1].mode; rtx xop0 = op0; if (target) temp = target; else temp = gen_reg_rtx (mode); if (GET_MODE (xop0) != VOIDmode && GET_MODE (xop0) != mode0) xop0 = convert_to_mode (mode0, xop0, unsignedp); /* Now, if insn doesn't accept our operand, put it into a pseudo. */ if (!insn_data[icode].operand[1].predicate (xop0, mode0)) xop0 = copy_to_mode_reg (mode0, xop0); if (!insn_data[icode].operand[0].predicate (temp, mode)) temp = gen_reg_rtx (mode); pat = GEN_FCN (icode) (temp, xop0); if (pat) { if (INSN_P (pat) && NEXT_INSN (pat) != NULL_RTX && ! add_equal_note (pat, temp, unoptab->code, xop0, NULL_RTX)) { delete_insns_since (last); return expand_unop (mode, unoptab, op0, NULL_RTX, unsignedp); } emit_insn (pat); return temp; } else delete_insns_since (last); } /* It can't be done in this mode. Can we open-code it in a wider mode? */ /* Widening clz needs special treatment. */ if (unoptab == clz_optab) { temp = widen_clz (mode, op0, target); if (temp) return temp; else goto try_libcall; } if (CLASS_HAS_WIDER_MODES_P (class)) for (wider_mode = GET_MODE_WIDER_MODE (mode); wider_mode != VOIDmode; wider_mode = GET_MODE_WIDER_MODE (wider_mode)) { if (unoptab->handlers[(int) wider_mode].insn_code != CODE_FOR_nothing) { rtx xop0 = op0; /* For certain operations, we need not actually extend the narrow operand, as long as we will truncate the results to the same narrowness. */ xop0 = widen_operand (xop0, wider_mode, mode, unsignedp, (unoptab == neg_optab || unoptab == one_cmpl_optab) && class == MODE_INT); temp = expand_unop (wider_mode, unoptab, xop0, NULL_RTX, unsignedp); if (temp) { if (class != MODE_INT || !TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode), GET_MODE_BITSIZE (wider_mode))) { if (target == 0) target = gen_reg_rtx (mode); convert_move (target, temp, 0); return target; } else return gen_lowpart (mode, temp); } else delete_insns_since (last); } } /* These can be done a word at a time. */ if (unoptab == one_cmpl_optab && class == MODE_INT && GET_MODE_SIZE (mode) > UNITS_PER_WORD && unoptab->handlers[(int) word_mode].insn_code != CODE_FOR_nothing) { int i; rtx insns; if (target == 0 || target == op0) target = gen_reg_rtx (mode); start_sequence (); /* Do the actual arithmetic. */ for (i = 0; i < GET_MODE_BITSIZE (mode) / BITS_PER_WORD; i++) { rtx target_piece = operand_subword (target, i, 1, mode); rtx x = expand_unop (word_mode, unoptab, operand_subword_force (op0, i, mode), target_piece, unsignedp); if (target_piece != x) emit_move_insn (target_piece, x); } insns = get_insns (); end_sequence (); emit_no_conflict_block (insns, target, op0, NULL_RTX, gen_rtx_fmt_e (unoptab->code, mode, copy_rtx (op0))); return target; } if (unoptab->code == NEG) { /* Try negating floating point values by flipping the sign bit. */ if (SCALAR_FLOAT_MODE_P (mode)) { temp = expand_absneg_bit (NEG, mode, op0, target); if (temp) return temp; } /* If there is no negation pattern, and we have no negative zero, try subtracting from zero. */ if (!HONOR_SIGNED_ZEROS (mode)) { temp = expand_binop (mode, (unoptab == negv_optab ? subv_optab : sub_optab), CONST0_RTX (mode), op0, target, unsignedp, OPTAB_DIRECT); if (temp) return temp; } } /* Try calculating parity (x) as popcount (x) % 2. */ if (unoptab == parity_optab) { temp = expand_parity (mode, op0, target); if (temp) return temp; } try_libcall: /* Now try a library call in this mode. */ if (unoptab->handlers[(int) mode].libfunc) { rtx insns; rtx value; enum machine_mode outmode = mode; /* All of these functions return small values. Thus we choose to have them return something that isn't a double-word. */ if (unoptab == ffs_optab || unoptab == clz_optab || unoptab == ctz_optab || unoptab == popcount_optab || unoptab == parity_optab) outmode = GET_MODE (hard_libcall_value (TYPE_MODE (integer_type_node))); start_sequence (); /* Pass 1 for NO_QUEUE so we don't lose any increments if the libcall is cse'd or moved. */ value = emit_library_call_value (unoptab->handlers[(int) mode].libfunc, NULL_RTX, LCT_CONST, outmode, 1, op0, mode); insns = get_insns (); end_sequence (); target = gen_reg_rtx (outmode); emit_libcall_block (insns, target, value, gen_rtx_fmt_e (unoptab->code, outmode, op0)); return target; } /* It can't be done in this mode. Can we do it in a wider mode? */ if (CLASS_HAS_WIDER_MODES_P (class)) { for (wider_mode = GET_MODE_WIDER_MODE (mode); wider_mode != VOIDmode; wider_mode = GET_MODE_WIDER_MODE (wider_mode)) { if ((unoptab->handlers[(int) wider_mode].insn_code != CODE_FOR_nothing) || unoptab->handlers[(int) wider_mode].libfunc) { rtx xop0 = op0; /* For certain operations, we need not actually extend the narrow operand, as long as we will truncate the results to the same narrowness. */ xop0 = widen_operand (xop0, wider_mode, mode, unsignedp, (unoptab == neg_optab || unoptab == one_cmpl_optab) && class == MODE_INT); temp = expand_unop (wider_mode, unoptab, xop0, NULL_RTX, unsignedp); /* If we are generating clz using wider mode, adjust the result. */ if (unoptab == clz_optab && temp != 0) temp = expand_binop (wider_mode, sub_optab, temp, GEN_INT (GET_MODE_BITSIZE (wider_mode) - GET_MODE_BITSIZE (mode)), target, true, OPTAB_DIRECT); if (temp) { if (class != MODE_INT) { if (target == 0) target = gen_reg_rtx (mode); convert_move (target, temp, 0); return target; } else return gen_lowpart (mode, temp); } else delete_insns_since (last); } } } /* One final attempt at implementing negation via subtraction, this time allowing widening of the operand. */ if (unoptab->code == NEG && !HONOR_SIGNED_ZEROS (mode)) { rtx temp; temp = expand_binop (mode, unoptab == negv_optab ? subv_optab : sub_optab, CONST0_RTX (mode), op0, target, unsignedp, OPTAB_LIB_WIDEN); if (temp) return temp; } return 0; } /* Emit code to compute the absolute value of OP0, with result to TARGET if convenient. (TARGET may be 0.) The return value says where the result actually is to be found. MODE is the mode of the operand; the mode of the result is different but can be deduced from MODE. */ rtx expand_abs_nojump (enum machine_mode mode, rtx op0, rtx target, int result_unsignedp) { rtx temp; if (! flag_trapv) result_unsignedp = 1; /* First try to do it with a special abs instruction. */ temp = expand_unop (mode, result_unsignedp ? abs_optab : absv_optab, op0, target, 0); if (temp != 0) return temp; /* For floating point modes, try clearing the sign bit. */ if (SCALAR_FLOAT_MODE_P (mode)) { temp = expand_absneg_bit (ABS, mode, op0, target); if (temp) return temp; } /* If we have a MAX insn, we can do this as MAX (x, -x). */ if (smax_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing && !HONOR_SIGNED_ZEROS (mode)) { rtx last = get_last_insn (); temp = expand_unop (mode, neg_optab, op0, NULL_RTX, 0); if (temp != 0) temp = expand_binop (mode, smax_optab, op0, temp, target, 0, OPTAB_WIDEN); if (temp != 0) return temp; delete_insns_since (last); } /* If this machine has expensive jumps, we can do integer absolute value of X as (((signed) x >> (W-1)) ^ x) - ((signed) x >> (W-1)), where W is the width of MODE. */ if (GET_MODE_CLASS (mode) == MODE_INT && BRANCH_COST >= 2) { rtx extended = expand_shift (RSHIFT_EXPR, mode, op0, size_int (GET_MODE_BITSIZE (mode) - 1), NULL_RTX, 0); temp = expand_binop (mode, xor_optab, extended, op0, target, 0, OPTAB_LIB_WIDEN); if (temp != 0) temp = expand_binop (mode, result_unsignedp ? sub_optab : subv_optab, temp, extended, target, 0, OPTAB_LIB_WIDEN); if (temp != 0) return temp; } return NULL_RTX; } rtx expand_abs (enum machine_mode mode, rtx op0, rtx target, int result_unsignedp, int safe) { rtx temp, op1; if (! flag_trapv) result_unsignedp = 1; temp = expand_abs_nojump (mode, op0, target, result_unsignedp); if (temp != 0) return temp; /* If that does not win, use conditional jump and negate. */ /* It is safe to use the target if it is the same as the source if this is also a pseudo register */ if (op0 == target && REG_P (op0) && REGNO (op0) >= FIRST_PSEUDO_REGISTER) safe = 1; op1 = gen_label_rtx (); if (target == 0 || ! safe || GET_MODE (target) != mode || (MEM_P (target) && MEM_VOLATILE_P (target)) || (REG_P (target) && REGNO (target) < FIRST_PSEUDO_REGISTER)) target = gen_reg_rtx (mode); emit_move_insn (target, op0); NO_DEFER_POP; do_compare_rtx_and_jump (target, CONST0_RTX (mode), GE, 0, mode, NULL_RTX, NULL_RTX, op1); op0 = expand_unop (mode, result_unsignedp ? neg_optab : negv_optab, target, target, 0); if (op0 != target) emit_move_insn (target, op0); emit_label (op1); OK_DEFER_POP; return target; } /* A subroutine of expand_copysign, perform the copysign operation using the abs and neg primitives advertised to exist on the target. The assumption is that we have a split register file, and leaving op0 in fp registers, and not playing with subregs so much, will help the register allocator. */ static rtx expand_copysign_absneg (enum machine_mode mode, rtx op0, rtx op1, rtx target, int bitpos, bool op0_is_abs) { enum machine_mode imode; HOST_WIDE_INT hi, lo; int word; rtx label; if (target == op1) target = NULL_RTX; if (!op0_is_abs) { op0 = expand_unop (mode, abs_optab, op0, target, 0); if (op0 == NULL) return NULL_RTX; target = op0; } else { if (target == NULL_RTX) target = copy_to_reg (op0); else emit_move_insn (target, op0); } if (GET_MODE_SIZE (mode) <= UNITS_PER_WORD) { imode = int_mode_for_mode (mode); if (imode == BLKmode) return NULL_RTX; op1 = gen_lowpart (imode, op1); } else { imode = word_mode; if (FLOAT_WORDS_BIG_ENDIAN) word = (GET_MODE_BITSIZE (mode) - bitpos) / BITS_PER_WORD; else word = bitpos / BITS_PER_WORD; bitpos = bitpos % BITS_PER_WORD; op1 = operand_subword_force (op1, word, mode); } if (bitpos < HOST_BITS_PER_WIDE_INT) { hi = 0; lo = (HOST_WIDE_INT) 1 << bitpos; } else { hi = (HOST_WIDE_INT) 1 << (bitpos - HOST_BITS_PER_WIDE_INT); lo = 0; } op1 = expand_binop (imode, and_optab, op1, immed_double_const (lo, hi, imode), NULL_RTX, 1, OPTAB_LIB_WIDEN); label = gen_label_rtx (); emit_cmp_and_jump_insns (op1, const0_rtx, EQ, NULL_RTX, imode, 1, label); if (GET_CODE (op0) == CONST_DOUBLE) op0 = simplify_unary_operation (NEG, mode, op0, mode); else op0 = expand_unop (mode, neg_optab, op0, target, 0); if (op0 != target) emit_move_insn (target, op0); emit_label (label); return target; } /* A subroutine of expand_copysign, perform the entire copysign operation with integer bitmasks. BITPOS is the position of the sign bit; OP0_IS_ABS is true if op0 is known to have its sign bit clear. */ static rtx expand_copysign_bit (enum machine_mode mode, rtx op0, rtx op1, rtx target, int bitpos, bool op0_is_abs) { enum machine_mode imode; HOST_WIDE_INT hi, lo; int word, nwords, i; rtx temp, insns; if (GET_MODE_SIZE (mode) <= UNITS_PER_WORD) { imode = int_mode_for_mode (mode); if (imode == BLKmode) return NULL_RTX; word = 0; nwords = 1; } else { imode = word_mode; if (FLOAT_WORDS_BIG_ENDIAN) word = (GET_MODE_BITSIZE (mode) - bitpos) / BITS_PER_WORD; else word = bitpos / BITS_PER_WORD; bitpos = bitpos % BITS_PER_WORD; nwords = (GET_MODE_BITSIZE (mode) + BITS_PER_WORD - 1) / BITS_PER_WORD; } if (bitpos < HOST_BITS_PER_WIDE_INT) { hi = 0; lo = (HOST_WIDE_INT) 1 << bitpos; } else { hi = (HOST_WIDE_INT) 1 << (bitpos - HOST_BITS_PER_WIDE_INT); lo = 0; } if (target == 0 || target == op0 || target == op1) target = gen_reg_rtx (mode); if (nwords > 1) { start_sequence (); for (i = 0; i < nwords; ++i) { rtx targ_piece = operand_subword (target, i, 1, mode); rtx op0_piece = operand_subword_force (op0, i, mode); if (i == word) { if (!op0_is_abs) op0_piece = expand_binop (imode, and_optab, op0_piece, immed_double_const (~lo, ~hi, imode), NULL_RTX, 1, OPTAB_LIB_WIDEN); op1 = expand_binop (imode, and_optab, operand_subword_force (op1, i, mode), immed_double_const (lo, hi, imode), NULL_RTX, 1, OPTAB_LIB_WIDEN); temp = expand_binop (imode, ior_optab, op0_piece, op1, targ_piece, 1, OPTAB_LIB_WIDEN); if (temp != targ_piece) emit_move_insn (targ_piece, temp); } else emit_move_insn (targ_piece, op0_piece); } insns = get_insns (); end_sequence (); emit_no_conflict_block (insns, target, op0, op1, NULL_RTX); } else { op1 = expand_binop (imode, and_optab, gen_lowpart (imode, op1), immed_double_const (lo, hi, imode), NULL_RTX, 1, OPTAB_LIB_WIDEN); op0 = gen_lowpart (imode, op0); if (!op0_is_abs) op0 = expand_binop (imode, and_optab, op0, immed_double_const (~lo, ~hi, imode), NULL_RTX, 1, OPTAB_LIB_WIDEN); temp = expand_binop (imode, ior_optab, op0, op1, gen_lowpart (imode, target), 1, OPTAB_LIB_WIDEN); target = lowpart_subreg_maybe_copy (mode, temp, imode); } return target; } /* Expand the C99 copysign operation. OP0 and OP1 must be the same scalar floating point mode. Return NULL if we do not know how to expand the operation inline. */ rtx expand_copysign (rtx op0, rtx op1, rtx target) { enum machine_mode mode = GET_MODE (op0); const struct real_format *fmt; bool op0_is_abs; rtx temp; gcc_assert (SCALAR_FLOAT_MODE_P (mode)); gcc_assert (GET_MODE (op1) == mode); /* First try to do it with a special instruction. */ temp = expand_binop (mode, copysign_optab, op0, op1, target, 0, OPTAB_DIRECT); if (temp) return temp; fmt = REAL_MODE_FORMAT (mode); if (fmt == NULL || !fmt->has_signed_zero) return NULL_RTX; op0_is_abs = false; if (GET_CODE (op0) == CONST_DOUBLE) { if (real_isneg (CONST_DOUBLE_REAL_VALUE (op0))) op0 = simplify_unary_operation (ABS, mode, op0, mode); op0_is_abs = true; } if (fmt->signbit_ro >= 0 && (GET_CODE (op0) == CONST_DOUBLE || (neg_optab->handlers[mode].insn_code != CODE_FOR_nothing && abs_optab->handlers[mode].insn_code != CODE_FOR_nothing))) { temp = expand_copysign_absneg (mode, op0, op1, target, fmt->signbit_ro, op0_is_abs); if (temp) return temp; } if (fmt->signbit_rw < 0) return NULL_RTX; return expand_copysign_bit (mode, op0, op1, target, fmt->signbit_rw, op0_is_abs); } /* Generate an instruction whose insn-code is INSN_CODE, with two operands: an output TARGET and an input OP0. TARGET *must* be nonzero, and the output is always stored there. CODE is an rtx code such that (CODE OP0) is an rtx that describes the value that is stored into TARGET. */ void emit_unop_insn (int icode, rtx target, rtx op0, enum rtx_code code) { rtx temp; enum machine_mode mode0 = insn_data[icode].operand[1].mode; rtx pat; temp = target; /* Now, if insn does not accept our operands, put them into pseudos. */ if (!insn_data[icode].operand[1].predicate (op0, mode0)) op0 = copy_to_mode_reg (mode0, op0); if (!insn_data[icode].operand[0].predicate (temp, GET_MODE (temp))) temp = gen_reg_rtx (GET_MODE (temp)); pat = GEN_FCN (icode) (temp, op0); if (INSN_P (pat) && NEXT_INSN (pat) != NULL_RTX && code != UNKNOWN) add_equal_note (pat, temp, code, op0, NULL_RTX); emit_insn (pat); if (temp != target) emit_move_insn (target, temp); } struct no_conflict_data { rtx target, first, insn; bool must_stay; }; /* Called via note_stores by emit_no_conflict_block and emit_libcall_block. Set P->must_stay if the currently examined clobber / store has to stay in the list of insns that constitute the actual no_conflict block / libcall block. */ static void no_conflict_move_test (rtx dest, rtx set, void *p0) { struct no_conflict_data *p= p0; /* If this inns directly contributes to setting the target, it must stay. */ if (reg_overlap_mentioned_p (p->target, dest)) p->must_stay = true; /* If we haven't committed to keeping any other insns in the list yet, there is nothing more to check. */ else if (p->insn == p->first) return; /* If this insn sets / clobbers a register that feeds one of the insns already in the list, this insn has to stay too. */ else if (reg_overlap_mentioned_p (dest, PATTERN (p->first)) || (CALL_P (p->first) && (find_reg_fusage (p->first, USE, dest))) || reg_used_between_p (dest, p->first, p->insn) /* Likewise if this insn depends on a register set by a previous insn in the list, or if it sets a result (presumably a hard register) that is set or clobbered by a previous insn. N.B. the modified_*_p (SET_DEST...) tests applied to a MEM SET_DEST perform the former check on the address, and the latter check on the MEM. */ || (GET_CODE (set) == SET && (modified_in_p (SET_SRC (set), p->first) || modified_in_p (SET_DEST (set), p->first) || modified_between_p (SET_SRC (set), p->first, p->insn) || modified_between_p (SET_DEST (set), p->first, p->insn)))) p->must_stay = true; } /* Encapsulate the block starting at FIRST and ending with LAST, which is logically equivalent to EQUIV, so it gets manipulated as a unit if it is possible to do so. */ static void maybe_encapsulate_block (rtx first, rtx last, rtx equiv) { if (!flag_non_call_exceptions || !may_trap_p (equiv)) { /* We can't attach the REG_LIBCALL and REG_RETVAL notes when the encapsulated region would not be in one basic block, i.e. when there is a control_flow_insn_p insn between FIRST and LAST. */ bool attach_libcall_retval_notes = true; rtx insn, next = NEXT_INSN (last); for (insn = first; insn != next; insn = NEXT_INSN (insn)) if (control_flow_insn_p (insn)) { attach_libcall_retval_notes = false; break; } if (attach_libcall_retval_notes) { REG_NOTES (first) = gen_rtx_INSN_LIST (REG_LIBCALL, last, REG_NOTES (first)); REG_NOTES (last) = gen_rtx_INSN_LIST (REG_RETVAL, first, REG_NOTES (last)); } } } /* Emit code to perform a series of operations on a multi-word quantity, one word at a time. Such a block is preceded by a CLOBBER of the output, consists of multiple insns, each setting one word of the output, and followed by a SET copying the output to itself. Each of the insns setting words of the output receives a REG_NO_CONFLICT note indicating that it doesn't conflict with the (also multi-word) inputs. The entire block is surrounded by REG_LIBCALL and REG_RETVAL notes. INSNS is a block of code generated to perform the operation, not including the CLOBBER and final copy. All insns that compute intermediate values are first emitted, followed by the block as described above. TARGET, OP0, and OP1 are the output and inputs of the operations, respectively. OP1 may be zero for a unary operation. EQUIV, if nonzero, is an expression to be placed into a REG_EQUAL note on the last insn. If TARGET is not a register, INSNS is simply emitted with no special processing. Likewise if anything in INSNS is not an INSN or if there is a libcall block inside INSNS. The final insn emitted is returned. */ rtx emit_no_conflict_block (rtx insns, rtx target, rtx op0, rtx op1, rtx equiv) { rtx prev, next, first, last, insn; if (!REG_P (target) || reload_in_progress) return emit_insn (insns); else for (insn = insns; insn; insn = NEXT_INSN (insn)) if (!NONJUMP_INSN_P (insn) || find_reg_note (insn, REG_LIBCALL, NULL_RTX)) return emit_insn (insns); /* First emit all insns that do not store into words of the output and remove these from the list. */ for (insn = insns; insn; insn = next) { rtx note; struct no_conflict_data data; next = NEXT_INSN (insn); /* Some ports (cris) create a libcall regions at their own. We must avoid any potential nesting of LIBCALLs. */ if ((note = find_reg_note (insn, REG_LIBCALL, NULL)) != NULL) remove_note (insn, note); if ((note = find_reg_note (insn, REG_RETVAL, NULL)) != NULL) remove_note (insn, note); data.target = target; data.first = insns; data.insn = insn; data.must_stay = 0; note_stores (PATTERN (insn), no_conflict_move_test, &data); if (! data.must_stay) { if (PREV_INSN (insn)) NEXT_INSN (PREV_INSN (insn)) = next; else insns = next; if (next) PREV_INSN (next) = PREV_INSN (insn); add_insn (insn); } } prev = get_last_insn (); /* Now write the CLOBBER of the output, followed by the setting of each of the words, followed by the final copy. */ if (target != op0 && target != op1) emit_insn (gen_rtx_CLOBBER (VOIDmode, target)); for (insn = insns; insn; insn = next) { next = NEXT_INSN (insn); add_insn (insn); if (op1 && REG_P (op1)) REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_NO_CONFLICT, op1, REG_NOTES (insn)); if (op0 && REG_P (op0)) REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_NO_CONFLICT, op0, REG_NOTES (insn)); } if (mov_optab->handlers[(int) GET_MODE (target)].insn_code != CODE_FOR_nothing) { last = emit_move_insn (target, target); if (equiv) set_unique_reg_note (last, REG_EQUAL, equiv); } else { last = get_last_insn (); /* Remove any existing REG_EQUAL note from "last", or else it will be mistaken for a note referring to the full contents of the alleged libcall value when found together with the REG_RETVAL note added below. An existing note can come from an insn expansion at "last". */ remove_note (last, find_reg_note (last, REG_EQUAL, NULL_RTX)); } if (prev == 0) first = get_insns (); else first = NEXT_INSN (prev); maybe_encapsulate_block (first, last, equiv); return last; } /* Emit code to make a call to a constant function or a library call. INSNS is a list containing all insns emitted in the call. These insns leave the result in RESULT. Our block is to copy RESULT to TARGET, which is logically equivalent to EQUIV. We first emit any insns that set a pseudo on the assumption that these are loading constants into registers; doing so allows them to be safely cse'ed between blocks. Then we emit all the other insns in the block, followed by an insn to move RESULT to TARGET. This last insn will have a REQ_EQUAL note with an operand of EQUIV. Moving assignments to pseudos outside of the block is done to improve the generated code, but is not required to generate correct code, hence being unable to move an assignment is not grounds for not making a libcall block. There are two reasons why it is safe to leave these insns inside the block: First, we know that these pseudos cannot be used in generated RTL outside the block since they are created for temporary purposes within the block. Second, CSE will not record the values of anything set inside a libcall block, so we know they must be dead at the end of the block. Except for the first group of insns (the ones setting pseudos), the block is delimited by REG_RETVAL and REG_LIBCALL notes. */ void emit_libcall_block (rtx insns, rtx target, rtx result, rtx equiv) { rtx final_dest = target; rtx prev, next, first, last, insn; /* If this is a reg with REG_USERVAR_P set, then it could possibly turn into a MEM later. Protect the libcall block from this change. */ if (! REG_P (target) || REG_USERVAR_P (target)) target = gen_reg_rtx (GET_MODE (target)); /* If we're using non-call exceptions, a libcall corresponding to an operation that may trap may also trap. */ if (flag_non_call_exceptions && may_trap_p (equiv)) { for (insn = insns; insn; insn = NEXT_INSN (insn)) if (CALL_P (insn)) { rtx note = find_reg_note (insn, REG_EH_REGION, NULL_RTX); if (note != 0 && INTVAL (XEXP (note, 0)) <= 0) remove_note (insn, note); } } else /* look for any CALL_INSNs in this sequence, and attach a REG_EH_REGION reg note to indicate that this call cannot throw or execute a nonlocal goto (unless there is already a REG_EH_REGION note, in which case we update it). */ for (insn = insns; insn; insn = NEXT_INSN (insn)) if (CALL_P (insn)) { rtx note = find_reg_note (insn, REG_EH_REGION, NULL_RTX); if (note != 0) XEXP (note, 0) = constm1_rtx; else REG_NOTES (insn) = gen_rtx_EXPR_LIST (REG_EH_REGION, constm1_rtx, REG_NOTES (insn)); } /* First emit all insns that set pseudos. Remove them from the list as we go. Avoid insns that set pseudos which were referenced in previous insns. These can be generated by move_by_pieces, for example, to update an address. Similarly, avoid insns that reference things set in previous insns. */ for (insn = insns; insn; insn = next) { rtx set = single_set (insn); rtx note; /* Some ports (cris) create a libcall regions at their own. We must avoid any potential nesting of LIBCALLs. */ if ((note = find_reg_note (insn, REG_LIBCALL, NULL)) != NULL) remove_note (insn, note); if ((note = find_reg_note (insn, REG_RETVAL, NULL)) != NULL) remove_note (insn, note); next = NEXT_INSN (insn); if (set != 0 && REG_P (SET_DEST (set)) && REGNO (SET_DEST (set)) >= FIRST_PSEUDO_REGISTER) { struct no_conflict_data data; data.target = const0_rtx; data.first = insns; data.insn = insn; data.must_stay = 0; note_stores (PATTERN (insn), no_conflict_move_test, &data); if (! data.must_stay) { if (PREV_INSN (insn)) NEXT_INSN (PREV_INSN (insn)) = next; else insns = next; if (next) PREV_INSN (next) = PREV_INSN (insn); add_insn (insn); } } /* Some ports use a loop to copy large arguments onto the stack. Don't move anything outside such a loop. */ if (LABEL_P (insn)) break; } prev = get_last_insn (); /* Write the remaining insns followed by the final copy. */ for (insn = insns; insn; insn = next) { next = NEXT_INSN (insn); add_insn (insn); } last = emit_move_insn (target, result); if (mov_optab->handlers[(int) GET_MODE (target)].insn_code != CODE_FOR_nothing) set_unique_reg_note (last, REG_EQUAL, copy_rtx (equiv)); else { /* Remove any existing REG_EQUAL note from "last", or else it will be mistaken for a note referring to the full contents of the libcall value when found together with the REG_RETVAL note added below. An existing note can come from an insn expansion at "last". */ remove_note (last, find_reg_note (last, REG_EQUAL, NULL_RTX)); } if (final_dest != target) emit_move_insn (final_dest, target); if (prev == 0) first = get_insns (); else first = NEXT_INSN (prev); maybe_encapsulate_block (first, last, equiv); } /* Nonzero if we can perform a comparison of mode MODE straightforwardly. PURPOSE describes how this comparison will be used. CODE is the rtx comparison code we will be using. ??? Actually, CODE is slightly weaker than that. A target is still required to implement all of the normal bcc operations, but not required to implement all (or any) of the unordered bcc operations. */ int can_compare_p (enum rtx_code code, enum machine_mode mode, enum can_compare_purpose purpose) { do { if (cmp_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing) { if (purpose == ccp_jump) return bcc_gen_fctn[(int) code] != NULL; else if (purpose == ccp_store_flag) return setcc_gen_code[(int) code] != CODE_FOR_nothing; else /* There's only one cmov entry point, and it's allowed to fail. */ return 1; } if (purpose == ccp_jump && cbranch_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing) return 1; if (purpose == ccp_cmov && cmov_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing) return 1; if (purpose == ccp_store_flag && cstore_optab->handlers[(int) mode].insn_code != CODE_FOR_nothing) return 1; mode = GET_MODE_WIDER_MODE (mode); } while (mode != VOIDmode); return 0; } /* This function is called when we are going to emit a compare instruction that compares the values found in *PX and *PY, using the rtl operator COMPARISON. *PMODE is the mode of the inputs (in case they are const_int). *PUNSIGNEDP nonzero says that the operands are unsigned; this matters if they need to be widened. If they have mode BLKmode, then SIZE specifies the size of both operands. This function performs all the setup necessary so that the caller only has to emit a single comparison insn. This setup can involve doing a BLKmode comparison or emitting a library call to perform the comparison if no insn is available to handle it. The values which are passed in through pointers can be modified; the caller should perform the comparison on the modified values. Constant comparisons must have already been folded. */ static void prepare_cmp_insn (rtx *px, rtx *py, enum rtx_code *pcomparison, rtx size, enum machine_mode *pmode, int *punsignedp, enum can_compare_purpose purpose) { enum machine_mode mode = *pmode; rtx x = *px, y = *py; int unsignedp = *punsignedp; /* If we are inside an appropriately-short loop and we are optimizing, force expensive constants into a register. */ if (CONSTANT_P (x) && optimize && rtx_cost (x, COMPARE) > COSTS_N_INSNS (1)) x = force_reg (mode, x); if (CONSTANT_P (y) && optimize && rtx_cost (y, COMPARE) > COSTS_N_INSNS (1)) y = force_reg (mode, y); #ifdef HAVE_cc0 /* Make sure if we have a canonical comparison. The RTL documentation states that canonical comparisons are required only for targets which have cc0. */ gcc_assert (!CONSTANT_P (x) || CONSTANT_P (y)); #endif /* Don't let both operands fail to indicate the mode. */ if (GET_MODE (x) == VOIDmode && GET_MODE (y) == VOIDmode) x = force_reg (mode, x); /* Handle all BLKmode compares. */ if (mode == BLKmode) { enum machine_mode cmp_mode, result_mode; enum insn_code cmp_code; tree length_type; rtx libfunc; rtx result; rtx opalign = GEN_INT (MIN (MEM_ALIGN (x), MEM_ALIGN (y)) / BITS_PER_UNIT); gcc_assert (size); /* Try to use a memory block compare insn - either cmpstr or cmpmem will do. */ for (cmp_mode = GET_CLASS_NARROWEST_MODE (MODE_INT); cmp_mode != VOIDmode; cmp_mode = GET_MODE_WIDER_MODE (cmp_mode)) { cmp_code = cmpmem_optab[cmp_mode]; if (cmp_code == CODE_FOR_nothing) cmp_code = cmpstr_optab[cmp_mode]; if (cmp_code == CODE_FOR_nothing) cmp_code = cmpstrn_optab[cmp_mode]; if (cmp_code == CODE_FOR_nothing) continue; /* Must make sure the size fits the insn's mode. */ if ((GET_CODE (size) == CONST_INT && INTVAL (size) >= (1 << GET_MODE_BITSIZE (cmp_mode))) || (GET_MODE_BITSIZE (GET_MODE (size)) > GET_MODE_BITSIZE (cmp_mode))) continue; result_mode = insn_data[cmp_code].operand[0].mode; result = gen_reg_rtx (result_mode); size = convert_to_mode (cmp_mode, size, 1); emit_insn (GEN_FCN (cmp_code) (result, x, y, size, opalign)); *px = result; *py = const0_rtx; *pmode = result_mode; return; } /* Otherwise call a library function, memcmp. */ libfunc = memcmp_libfunc; length_type = sizetype; result_mode = TYPE_MODE (integer_type_node); cmp_mode = TYPE_MODE (length_type); size = convert_to_mode (TYPE_MODE (length_type), size, TYPE_UNSIGNED (length_type)); result = emit_library_call_value (libfunc, 0, LCT_PURE_MAKE_BLOCK, result_mode, 3, XEXP (x, 0), Pmode, XEXP (y, 0), Pmode, size, cmp_mode); *px = result; *py = const0_rtx; *pmode = result_mode; return; } /* Don't allow operands to the compare to trap, as that can put the compare and branch in different basic blocks. */ if (flag_non_call_exceptions) { if (may_trap_p (x)) x = force_reg (mode, x); if (may_trap_p (y)) y = force_reg (mode, y); } *px = x; *py = y; if (can_compare_p (*pcomparison, mode, purpose)) return; /* Handle a lib call just for the mode we are using. */ if (cmp_optab->handlers[(int) mode].libfunc && !SCALAR_FLOAT_MODE_P (mode)) { rtx libfunc = cmp_optab->handlers[(int) mode].libfunc; rtx result; /* If we want unsigned, and this mode has a distinct unsigned comparison routine, use that. */ if (unsignedp && ucmp_optab->handlers[(int) mode].libfunc) libfunc = ucmp_optab->handlers[(int) mode].libfunc; result = emit_library_call_value (libfunc, NULL_RTX, LCT_CONST_MAKE_BLOCK, word_mode, 2, x, mode, y, mode); /* There are two kinds of comparison routines. Biased routines return 0/1/2, and unbiased routines return -1/0/1. Other parts of gcc expect that the comparison operation is equivalent to the modified comparison. For signed comparisons compare the result against 1 in the biased case, and zero in the unbiased case. For unsigned comparisons always compare against 1 after biasing the unbiased result by adding 1. This gives us a way to represent LTU. */ *px = result; *pmode = word_mode; *py = const1_rtx; if (!TARGET_LIB_INT_CMP_BIASED) { if (*punsignedp) *px = plus_constant (result, 1); else *py = const0_rtx; } return; } gcc_assert (SCALAR_FLOAT_MODE_P (mode)); prepare_float_lib_cmp (px, py, pcomparison, pmode, punsignedp); } /* Before emitting an insn with code ICODE, make sure that X, which is going to be used for operand OPNUM of the insn, is converted from mode MODE to WIDER_MODE (UNSIGNEDP determines whether it is an unsigned conversion), and that it is accepted by the operand predicate. Return the new value. */ static rtx prepare_operand (int icode, rtx x, int opnum, enum machine_mode mode, enum machine_mode wider_mode, int unsignedp) { if (mode != wider_mode) x = convert_modes (wider_mode, mode, x, unsignedp); if (!insn_data[icode].operand[opnum].predicate (x, insn_data[icode].operand[opnum].mode)) { if (no_new_pseudos) return NULL_RTX; x = copy_to_mode_reg (insn_data[icode].operand[opnum].mode, x); } return x; } /* Subroutine of emit_cmp_and_jump_insns; this function is called when we know we can do the comparison. The arguments are the same as for emit_cmp_and_jump_insns; but LABEL may be NULL_RTX which indicates that only a comparison is to be generated. */ static void emit_cmp_and_jump_insn_1 (rtx x, rtx y, enum machine_mode mode, enum rtx_code comparison, int unsignedp, rtx label) { rtx test = gen_rtx_fmt_ee (comparison, mode, x, y); enum mode_class class = GET_MODE_CLASS (mode); enum machine_mode wider_mode = mode; /* Try combined insns first. */ do { enum insn_code icode; PUT_MODE (test, wider_mode); if (label) { icode = cbranch_optab->handlers[(int) wider_mode].insn_code; if (icode != CODE_FOR_nothing && insn_data[icode].operand[0].predicate (test, wider_mode)) { x = prepare_operand (icode, x, 1, mode, wider_mode, unsignedp); y = prepare_operand (icode, y, 2, mode, wider_mode, unsignedp); emit_jump_insn (GEN_FCN (icode) (test, x, y, label)); return; } } /* Handle some compares against zero. */ icode = (int) tst_optab->handlers[(int) wider_mode].insn_code; if (y == CONST0_RTX (mode) && icode != CODE_FOR_nothing) { x = prepare_operand (icode, x, 0, mode, wider_mode, unsignedp); emit_insn (GEN_FCN (icode) (x)); if (label) emit_jump_insn (bcc_gen_fctn[(int) comparison] (label)); return; } /* Handle compares for which there is a directly suitable insn. */ icode = (int) cmp_optab->handlers[(int) wider_mode].insn_code; if (icode != CODE_FOR_nothing) { x = prepare_operand (icode, x, 0, mode, wider_mode, unsignedp); y = prepare_operand (icode, y, 1, mode, wider_mode, unsignedp); emit_insn (GEN_FCN (icode) (x, y)); if (label) emit_jump_insn (bcc_gen_fctn[(int) comparison] (label)); return; } if (!CLASS_HAS_WIDER_MODES_P (class)) break; wider_mode = GET_MODE_WIDER_MODE (wider_mode); } while (wider_mode != VOIDmode); gcc_unreachable (); } /* Generate code to compare X with Y so that the condition codes are set and to jump to LABEL if the condition is true. If X is a constant and Y is not a constant, then the comparison is swapped to ensure that the comparison RTL has the canonical form. UNSIGNEDP nonzero says that X and Y are unsigned; this matters if they need to be widened by emit_cmp_insn. UNSIGNEDP is also used to select the proper branch condition code. If X and Y have mode BLKmode, then SIZE specifies the size of both X and Y. MODE is the mode of the inputs (in case they are const_int). COMPARISON is the rtl operator to compare with (EQ, NE, GT, etc.). It will be passed unchanged to emit_cmp_insn, then potentially converted into an unsigned variant based on UNSIGNEDP to select a proper jump instruction. */ void emit_cmp_and_jump_insns (rtx x, rtx y, enum rtx_code comparison, rtx size, enum machine_mode mode, int unsignedp, rtx label) { rtx op0 = x, op1 = y; /* Swap operands and condition to ensure canonical RTL. */ if (swap_commutative_operands_p (x, y)) { /* If we're not emitting a branch, this means some caller is out of sync. */ gcc_assert (label); op0 = y, op1 = x; comparison = swap_condition (comparison); } #ifdef HAVE_cc0 /* If OP0 is still a constant, then both X and Y must be constants. Force X into a register to create canonical RTL. */ if (CONSTANT_P (op0)) op0 = force_reg (mode, op0); #endif if (unsignedp) comparison = unsigned_condition (comparison); prepare_cmp_insn (&op0, &op1, &comparison, size, &mode, &unsignedp, ccp_jump); emit_cmp_and_jump_insn_1 (op0, op1, mode, comparison, unsignedp, label); } /* Like emit_cmp_and_jump_insns, but generate only the comparison. */ void emit_cmp_insn (rtx x, rtx y, enum rtx_code comparison, rtx size, enum machine_mode mode, int unsignedp) { emit_cmp_and_jump_insns (x, y, comparison, size, mode, unsignedp, 0); } /* Emit a library call comparison between floating point X and Y. COMPARISON is the rtl operator to compare with (EQ, NE, GT, etc.). */ static void prepare_float_lib_cmp (rtx *px, rtx *py, enum rtx_code *pcomparison, enum machine_mode *pmode, int *punsignedp) { enum rtx_code comparison = *pcomparison; enum rtx_code swapped = swap_condition (comparison); enum rtx_code reversed = reverse_condition_maybe_unordered (comparison); rtx x = *px; rtx y = *py; enum machine_mode orig_mode = GET_MODE (x); enum machine_mode mode; rtx value, target, insns, equiv; rtx libfunc = 0; bool reversed_p = false; for (mode = orig_mode; mode != VOIDmode; mode = GET_MODE_WIDER_MODE (mode)) { if ((libfunc = code_to_optab[comparison]->handlers[mode].libfunc)) break; if ((libfunc = code_to_optab[swapped]->handlers[mode].libfunc)) { rtx tmp; tmp = x; x = y; y = tmp; comparison = swapped; break; } if ((libfunc = code_to_optab[reversed]->handlers[mode].libfunc) && FLOAT_LIB_COMPARE_RETURNS_BOOL (mode, reversed)) { comparison = reversed; reversed_p = true; break; } } gcc_assert (mode != VOIDmode); if (mode != orig_mode) { x = convert_to_mode (mode, x, 0); y = convert_to_mode (mode, y, 0); } /* Attach a REG_EQUAL note describing the semantics of the libcall to the RTL. The allows the RTL optimizers to delete the libcall if the condition can be determined at compile-time. */ if (comparison == UNORDERED) { rtx temp = simplify_gen_relational (NE, word_mode, mode, x, x); equiv = simplify_gen_relational (NE, word_mode, mode, y, y); equiv = simplify_gen_ternary (IF_THEN_ELSE, word_mode, word_mode, temp, const_true_rtx, equiv); } else { equiv = simplify_gen_relational (comparison, word_mode, mode, x, y); if (! FLOAT_LIB_COMPARE_RETURNS_BOOL (mode, comparison)) { rtx true_rtx, false_rtx; switch (comparison) { case EQ: true_rtx = const0_rtx; false_rtx = const_true_rtx; break; case NE: true_rtx = const_true_rtx; false_rtx = const0_rtx; break; case GT: true_rtx = const1_rtx; false_rtx = const0_rtx; break; case GE: true_rtx = const0_rtx; false_rtx = constm1_rtx; break; case LT: true_rtx = constm1_rtx; false_rtx = const0_rtx; break; case LE: true_rtx = const0_rtx; false_rtx = const1_rtx; break; default: gcc_unreachable (); } equiv = simplify_gen_ternary (IF_THEN_ELSE, word_mode, word_mode, equiv, true_rtx, false_rtx); } } start_sequence (); value = emit_library_call_value (libfunc, NULL_RTX, LCT_CONST, word_mode, 2, x, mode, y, mode); insns = get_insns (); end_sequence (); target = gen_reg_rtx (word_mode); emit_libcall_block (insns, target, value, equiv); if (comparison == UNORDERED || FLOAT_LIB_COMPARE_RETURNS_BOOL (mode, comparison)) comparison = reversed_p ? EQ : NE; *px = target; *py = const0_rtx; *pmode = word_mode; *pcomparison = comparison; *punsignedp = 0; } /* Generate code to indirectly jump to a location given in the rtx LOC. */ void emit_indirect_jump (rtx loc) { if (!insn_data[(int) CODE_FOR_indirect_jump].operand[0].predicate (loc, Pmode)) loc = copy_to_mode_reg (Pmode, loc); emit_jump_insn (gen_indirect_jump (loc)); emit_barrier (); } #ifdef HAVE_conditional_move /* Emit a conditional move instruction if the machine supports one for that condition and machine mode. OP0 and OP1 are the operands that should be compared using CODE. CMODE is the mode to use should they be constants. If it is VOIDmode, they cannot both be constants. OP2 should be stored in TARGET if the comparison is true, otherwise OP3 should be stored there. MODE is the mode to use should they be constants. If it is VOIDmode, they cannot both be constants. The result is either TARGET (perhaps modified) or NULL_RTX if the operation is not supported. */ rtx emit_conditional_move (rtx target, enum rtx_code code, rtx op0, rtx op1, enum machine_mode cmode, rtx op2, rtx op3, enum machine_mode mode, int unsignedp) { rtx tem, subtarget, comparison, insn; enum insn_code icode; enum rtx_code reversed; /* If one operand is constant, make it the second one. Only do this if the other operand is not constant as well. */ if (swap_commutative_operands_p (op0, op1)) { tem = op0; op0 = op1; op1 = tem; code = swap_condition (code); } /* get_condition will prefer to generate LT and GT even if the old comparison was against zero, so undo that canonicalization here since comparisons against zero are cheaper. */ if (code == LT && op1 == const1_rtx) code = LE, op1 = const0_rtx; else if (code == GT && op1 == constm1_rtx) code = GE, op1 = const0_rtx; if (cmode == VOIDmode) cmode = GET_MODE (op0); if (swap_commutative_operands_p (op2, op3) && ((reversed = reversed_comparison_code_parts (code, op0, op1, NULL)) != UNKNOWN)) { tem = op2; op2 = op3; op3 = tem; code = reversed; } if (mode == VOIDmode) mode = GET_MODE (op2); icode = movcc_gen_code[mode]; if (icode == CODE_FOR_nothing) return 0; if (!target) target = gen_reg_rtx (mode); subtarget = target; /* If the insn doesn't accept these operands, put them in pseudos. */ if (!insn_data[icode].operand[0].predicate (subtarget, insn_data[icode].operand[0].mode)) subtarget = gen_reg_rtx (insn_data[icode].operand[0].mode); if (!insn_data[icode].operand[2].predicate (op2, insn_data[icode].operand[2].mode)) op2 = copy_to_mode_reg (insn_data[icode].operand[2].mode, op2); if (!insn_data[icode].operand[3].predicate (op3, insn_data[icode].operand[3].mode)) op3 = copy_to_mode_reg (insn_data[icode].operand[3].mode, op3); /* Everything should now be in the suitable form, so emit the compare insn and then the conditional move. */ comparison = compare_from_rtx (op0, op1, code, unsignedp, cmode, NULL_RTX); /* ??? Watch for const0_rtx (nop) and const_true_rtx (unconditional)? */ /* We can get const0_rtx or const_true_rtx in some circumstances. Just return NULL and let the caller figure out how best to deal with this situation. */ if (GET_CODE (comparison) != code) return NULL_RTX; insn = GEN_FCN (icode) (subtarget, comparison, op2, op3); /* If that failed, then give up. */ if (insn == 0) return 0; emit_insn (insn); if (subtarget != target) convert_move (target, subtarget, 0); return target; } /* Return nonzero if a conditional move of mode MODE is supported. This function is for combine so it can tell whether an insn that looks like a conditional move is actually supported by the hardware. If we guess wrong we lose a bit on optimization, but that's it. */ /* ??? sparc64 supports conditionally moving integers values based on fp comparisons, and vice versa. How do we handle them? */ int can_conditionally_move_p (enum machine_mode mode) { if (movcc_gen_code[mode] != CODE_FOR_nothing) return 1; return 0; } #endif /* HAVE_conditional_move */ /* Emit a conditional addition instruction if the machine supports one for that condition and machine mode. OP0 and OP1 are the operands that should be compared using CODE. CMODE is the mode to use should they be constants. If it is VOIDmode, they cannot both be constants. OP2 should be stored in TARGET if the comparison is true, otherwise OP2+OP3 should be stored there. MODE is the mode to use should they be constants. If it is VOIDmode, they cannot both be constants. The result is either TARGET (perhaps modified) or NULL_RTX if the operation is not supported. */ rtx emit_conditional_add (rtx target, enum rtx_code code, rtx op0, rtx op1, enum machine_mode cmode, rtx op2, rtx op3, enum machine_mode mode, int unsignedp) { rtx tem, subtarget, comparison, insn; enum insn_code icode; enum rtx_code reversed; /* If one operand is constant, make it the second one. Only do this if the other operand is not constant as well. */ if (swap_commutative_operands_p (op0, op1)) { tem = op0; op0 = op1; op1 = tem; code = swap_condition (code); } /* get_condition will prefer to generate LT and GT even if the old comparison was against zero, so undo that canonicalization here since comparisons against zero are cheaper. */ if (code == LT && op1 == const1_rtx) code = LE, op1 = const0_rtx; else if (code == GT && op1 == constm1_rtx) code = GE, op1 = const0_rtx; if (cmode == VOIDmode) cmode = GET_MODE (op0); if (swap_commutative_operands_p (op2, op3) && ((reversed = reversed_comparison_code_parts (code, op0, op1, NULL)) != UNKNOWN)) { tem = op2; op2 = op3; op3 = tem; code = reversed; } if (mode == VOIDmode) mode = GET_MODE (op2); icode = addcc_optab->handlers[(int) mode].insn_code; if (icode == CODE_FOR_nothing) return 0; if (!target) target = gen_reg_rtx (mode); /* If the insn doesn't accept these operands, put them in pseudos. */ if (!insn_data[icode].operand[0].predicate (target, insn_data[icode].operand[0].mode)) subtarget = gen_reg_rtx (insn_data[icode].operand[0].mode); else subtarget = target; if (!insn_data[icode].operand[2].predicate (op2, insn_data[icode].operand[2].mode)) op2 = copy_to_mode_reg (insn_data[icode].operand[2].mode, op2); if (!insn_data[icode].operand[3].predicate (op3, insn_data[icode].operand[3].mode)) op3 = copy_to_mode_reg (insn_data[icode].operand[3].mode, op3); /* Everything should now be in the suitable form, so emit the compare insn and then the conditional move. */ comparison = compare_from_rtx (op0, op1, code, unsignedp, cmode, NULL_RTX); /* ??? Watch for const0_rtx (nop) and const_true_rtx (unconditional)? */ /* We can get const0_rtx or const_true_rtx in some circumstances. Just return NULL and let the caller figure out how best to deal with this situation. */ if (GET_CODE (comparison) != code) return NULL_RTX; insn = GEN_FCN (icode) (subtarget, comparison, op2, op3); /* If that failed, then give up. */ if (insn == 0) return 0; emit_insn (insn); if (subtarget != target) convert_move (target, subtarget, 0); return target; } /* These functions attempt to generate an insn body, rather than emitting the insn, but if the gen function already emits them, we make no attempt to turn them back into naked patterns. */ /* Generate and return an insn body to add Y to X. */ rtx gen_add2_insn (rtx x, rtx y) { int icode = (int) add_optab->handlers[(int) GET_MODE (x)].insn_code; gcc_assert (insn_data[icode].operand[0].predicate (x, insn_data[icode].operand[0].mode)); gcc_assert (insn_data[icode].operand[1].predicate (x, insn_data[icode].operand[1].mode)); gcc_assert (insn_data[icode].operand[2].predicate (y, insn_data[icode].operand[2].mode)); return GEN_FCN (icode) (x, x, y); } /* Generate and return an insn body to add r1 and c, storing the result in r0. */ rtx gen_add3_insn (rtx r0, rtx r1, rtx c) { int icode = (int) add_optab->handlers[(int) GET_MODE (r0)].insn_code; if (icode == CODE_FOR_nothing || !(insn_data[icode].operand[0].predicate (r0, insn_data[icode].operand[0].mode)) || !(insn_data[icode].operand[1].predicate (r1, insn_data[icode].operand[1].mode)) || !(insn_data[icode].operand[2].predicate (c, insn_data[icode].operand[2].mode))) return NULL_RTX; return GEN_FCN (icode) (r0, r1, c); } int have_add2_insn (rtx x, rtx y) { int icode; gcc_assert (GET_MODE (x) != VOIDmode); icode = (int) add_optab->handlers[(int) GET_MODE (x)].insn_code; if (icode == CODE_FOR_nothing) return 0; if (!(insn_data[icode].operand[0].predicate (x, insn_data[icode].operand[0].mode)) || !(insn_data[icode].operand[1].predicate (x, insn_data[icode].operand[1].mode)) || !(insn_data[icode].operand[2].predicate (y, insn_data[icode].operand[2].mode))) return 0; return 1; } /* Generate and return an insn body to subtract Y from X. */ rtx gen_sub2_insn (rtx x, rtx y) { int icode = (int) sub_optab->handlers[(int) GET_MODE (x)].insn_code; gcc_assert (insn_data[icode].operand[0].predicate (x, insn_data[icode].operand[0].mode)); gcc_assert (insn_data[icode].operand[1].predicate (x, insn_data[icode].operand[1].mode)); gcc_assert (insn_data[icode].operand[2].predicate (y, insn_data[icode].operand[2].mode)); return GEN_FCN (icode) (x, x, y); } /* Generate and return an insn body to subtract r1 and c, storing the result in r0. */ rtx gen_sub3_insn (rtx r0, rtx r1, rtx c) { int icode = (int) sub_optab->handlers[(int) GET_MODE (r0)].insn_code; if (icode == CODE_FOR_nothing || !(insn_data[icode].operand[0].predicate (r0, insn_data[icode].operand[0].mode)) || !(insn_data[icode].operand[1].predicate (r1, insn_data[icode].operand[1].mode)) || !(insn_data[icode].operand[2].predicate (c, insn_data[icode].operand[2].mode))) return NULL_RTX; return GEN_FCN (icode) (r0, r1, c); } int have_sub2_insn (rtx x, rtx y) { int icode; gcc_assert (GET_MODE (x) != VOIDmode); icode = (int) sub_optab->handlers[(int) GET_MODE (x)].insn_code; if (icode == CODE_FOR_nothing) return 0; if (!(insn_data[icode].operand[0].predicate (x, insn_data[icode].operand[0].mode)) || !(insn_data[icode].operand[1].predicate (x, insn_data[icode].operand[1].mode)) || !(insn_data[icode].operand[2].predicate (y, insn_data[icode].operand[2].mode))) return 0; return 1; } /* Generate the body of an instruction to copy Y into X. It may be a list of insns, if one insn isn't enough. */ rtx gen_move_insn (rtx x, rtx y) { rtx seq; start_sequence (); emit_move_insn_1 (x, y); seq = get_insns (); end_sequence (); return seq; } /* Return the insn code used to extend FROM_MODE to TO_MODE. UNSIGNEDP specifies zero-extension instead of sign-extension. If no such operation exists, CODE_FOR_nothing will be returned. */ enum insn_code can_extend_p (enum machine_mode to_mode, enum machine_mode from_mode, int unsignedp) { convert_optab tab; #ifdef HAVE_ptr_extend if (unsignedp < 0) return CODE_FOR_ptr_extend; #endif tab = unsignedp ? zext_optab : sext_optab; return tab->handlers[to_mode][from_mode].insn_code; } /* Generate the body of an insn to extend Y (with mode MFROM) into X (with mode MTO). Do zero-extension if UNSIGNEDP is nonzero. */ rtx gen_extend_insn (rtx x, rtx y, enum machine_mode mto, enum machine_mode mfrom, int unsignedp) { enum insn_code icode = can_extend_p (mto, mfrom, unsignedp); return GEN_FCN (icode) (x, y); } /* can_fix_p and can_float_p say whether the target machine can directly convert a given fixed point type to a given floating point type, or vice versa. The returned value is the CODE_FOR_... value to use, or CODE_FOR_nothing if these modes cannot be directly converted. *TRUNCP_PTR is set to 1 if it is necessary to output an explicit FTRUNC insn before the fix insn; otherwise 0. */ static enum insn_code can_fix_p (enum machine_mode fixmode, enum machine_mode fltmode, int unsignedp, int *truncp_ptr) { convert_optab tab; enum insn_code icode; tab = unsignedp ? ufixtrunc_optab : sfixtrunc_optab; icode = tab->handlers[fixmode][fltmode].insn_code; if (icode != CODE_FOR_nothing) { *truncp_ptr = 0; return icode; } /* FIXME: This requires a port to define both FIX and FTRUNC pattern for this to work. We need to rework the fix* and ftrunc* patterns and documentation. */ tab = unsignedp ? ufix_optab : sfix_optab; icode = tab->handlers[fixmode][fltmode].insn_code; if (icode != CODE_FOR_nothing && ftrunc_optab->handlers[fltmode].insn_code != CODE_FOR_nothing) { *truncp_ptr = 1; return icode; } *truncp_ptr = 0; return CODE_FOR_nothing; } static enum insn_code can_float_p (enum machine_mode fltmode, enum machine_mode fixmode, int unsignedp) { convert_optab tab; tab = unsignedp ? ufloat_optab : sfloat_optab; return tab->handlers[fltmode][fixmode].insn_code; } /* Generate code to convert FROM to floating point and store in TO. FROM must be fixed point and not VOIDmode. UNSIGNEDP nonzero means regard FROM as unsigned. Normally this is done by correcting the final value if it is negative. */ void expand_float (rtx to, rtx from, int unsignedp) { enum insn_code icode; rtx target = to; enum machine_mode fmode, imode; bool can_do_signed = false; /* Crash now, because we won't be able to decide which mode to use. */ gcc_assert (GET_MODE (from) != VOIDmode); /* Look for an insn to do the conversion. Do it in the specified modes if possible; otherwise convert either input, output or both to wider mode. If the integer mode is wider than the mode of FROM, we can do the conversion signed even if the input is unsigned. */ for (fmode = GET_MODE (to); fmode != VOIDmode; fmode = GET_MODE_WIDER_MODE (fmode)) for (imode = GET_MODE (from); imode != VOIDmode; imode = GET_MODE_WIDER_MODE (imode)) { int doing_unsigned = unsignedp; if (fmode != GET_MODE (to) && significand_size (fmode) < GET_MODE_BITSIZE (GET_MODE (from))) continue; icode = can_float_p (fmode, imode, unsignedp); if (icode == CODE_FOR_nothing && unsignedp) { enum insn_code scode = can_float_p (fmode, imode, 0); if (scode != CODE_FOR_nothing) can_do_signed = true; if (imode != GET_MODE (from)) icode = scode, doing_unsigned = 0; } if (icode != CODE_FOR_nothing) { if (imode != GET_MODE (from)) from = convert_to_mode (imode, from, unsignedp); if (fmode != GET_MODE (to)) target = gen_reg_rtx (fmode); emit_unop_insn (icode, target, from, doing_unsigned ? UNSIGNED_FLOAT : FLOAT); if (target != to) convert_move (to, target, 0); return; } } /* Unsigned integer, and no way to convert directly. For binary floating point modes, convert as signed, then conditionally adjust the result. */ if (unsignedp && can_do_signed && !DECIMAL_FLOAT_MODE_P (GET_MODE (to))) { rtx label = gen_label_rtx (); rtx temp; REAL_VALUE_TYPE offset; /* Look for a usable floating mode FMODE wider than the source and at least as wide as the target. Using FMODE will avoid rounding woes with unsigned values greater than the signed maximum value. */ for (fmode = GET_MODE (to); fmode != VOIDmode; fmode = GET_MODE_WIDER_MODE (fmode)) if (GET_MODE_BITSIZE (GET_MODE (from)) < GET_MODE_BITSIZE (fmode) && can_float_p (fmode, GET_MODE (from), 0) != CODE_FOR_nothing) break; if (fmode == VOIDmode) { /* There is no such mode. Pretend the target is wide enough. */ fmode = GET_MODE (to); /* Avoid double-rounding when TO is narrower than FROM. */ if ((significand_size (fmode) + 1) < GET_MODE_BITSIZE (GET_MODE (from))) { rtx temp1; rtx neglabel = gen_label_rtx (); /* Don't use TARGET if it isn't a register, is a hard register, or is the wrong mode. */ if (!REG_P (target) || REGNO (target) < FIRST_PSEUDO_REGISTER || GET_MODE (target) != fmode) target = gen_reg_rtx (fmode); imode = GET_MODE (from); do_pending_stack_adjust (); /* Test whether the sign bit is set. */ emit_cmp_and_jump_insns (from, const0_rtx, LT, NULL_RTX, imode, 0, neglabel); /* The sign bit is not set. Convert as signed. */ expand_float (target, from, 0); emit_jump_insn (gen_jump (label)); emit_barrier (); /* The sign bit is set. Convert to a usable (positive signed) value by shifting right one bit, while remembering if a nonzero bit was shifted out; i.e., compute (from & 1) | (from >> 1). */ emit_label (neglabel); temp = expand_binop (imode, and_optab, from, const1_rtx, NULL_RTX, 1, OPTAB_LIB_WIDEN); temp1 = expand_shift (RSHIFT_EXPR, imode, from, integer_one_node, NULL_RTX, 1); temp = expand_binop (imode, ior_optab, temp, temp1, temp, 1, OPTAB_LIB_WIDEN); expand_float (target, temp, 0); /* Multiply by 2 to undo the shift above. */ temp = expand_binop (fmode, add_optab, target, target, target, 0, OPTAB_LIB_WIDEN); if (temp != target) emit_move_insn (target, temp); do_pending_stack_adjust (); emit_label (label); goto done; } } /* If we are about to do some arithmetic to correct for an unsigned operand, do it in a pseudo-register. */ if (GET_MODE (to) != fmode || !REG_P (to) || REGNO (to) < FIRST_PSEUDO_REGISTER) target = gen_reg_rtx (fmode); /* Convert as signed integer to floating. */ expand_float (target, from, 0); /* If FROM is negative (and therefore TO is negative), correct its value by 2**bitwidth. */ do_pending_stack_adjust (); emit_cmp_and_jump_insns (from, const0_rtx, GE, NULL_RTX, GET_MODE (from), 0, label); real_2expN (&offset, GET_MODE_BITSIZE (GET_MODE (from))); temp = expand_binop (fmode, add_optab, target, CONST_DOUBLE_FROM_REAL_VALUE (offset, fmode), target, 0, OPTAB_LIB_WIDEN); if (temp != target) emit_move_insn (target, temp); do_pending_stack_adjust (); emit_label (label); goto done; } /* No hardware instruction available; call a library routine. */ { rtx libfunc; rtx insns; rtx value; convert_optab tab = unsignedp ? ufloat_optab : sfloat_optab; if (GET_MODE_SIZE (GET_MODE (from)) < GET_MODE_SIZE (SImode)) from = convert_to_mode (SImode, from, unsignedp); libfunc = tab->handlers[GET_MODE (to)][GET_MODE (from)].libfunc; gcc_assert (libfunc); start_sequence (); value = emit_library_call_value (libfunc, NULL_RTX, LCT_CONST, GET_MODE (to), 1, from, GET_MODE (from)); insns = get_insns (); end_sequence (); emit_libcall_block (insns, target, value, gen_rtx_FLOAT (GET_MODE (to), from)); } done: /* Copy result to requested destination if we have been computing in a temp location. */ if (target != to) { if (GET_MODE (target) == GET_MODE (to)) emit_move_insn (to, target); else convert_move (to, target, 0); } } /* Generate code to convert FROM to fixed point and store in TO. FROM must be floating point. */ void expand_fix (rtx to, rtx from, int unsignedp) { enum insn_code icode; rtx target = to; enum machine_mode fmode, imode; int must_trunc = 0; /* We first try to find a pair of modes, one real and one integer, at least as wide as FROM and TO, respectively, in which we can open-code this conversion. If the integer mode is wider than the mode of TO, we can do the conversion either signed or unsigned. */ for (fmode = GET_MODE (from); fmode != VOIDmode; fmode = GET_MODE_WIDER_MODE (fmode)) for (imode = GET_MODE (to); imode != VOIDmode; imode = GET_MODE_WIDER_MODE (imode)) { int doing_unsigned = unsignedp; icode = can_fix_p (imode, fmode, unsignedp, &must_trunc); if (icode == CODE_FOR_nothing && imode != GET_MODE (to) && unsignedp) icode = can_fix_p (imode, fmode, 0, &must_trunc), doing_unsigned = 0; if (icode != CODE_FOR_nothing) { if (fmode != GET_MODE (from)) from = convert_to_mode (fmode, from, 0); if (must_trunc) { rtx temp = gen_reg_rtx (GET_MODE (from)); from = expand_unop (GET_MODE (from), ftrunc_optab, from, temp, 0); } if (imode != GET_MODE (to)) target = gen_reg_rtx (imode); emit_unop_insn (icode, target, from, doing_unsigned ? UNSIGNED_FIX : FIX); if (target != to) convert_move (to, target, unsignedp); return; } } /* For an unsigned conversion, there is one more way to do it. If we have a signed conversion, we generate code that compares the real value to the largest representable positive number. If if is smaller, the conversion is done normally. Otherwise, subtract one plus the highest signed number, convert, and add it back. We only need to check all real modes, since we know we didn't find anything with a wider integer mode. This code used to extend FP value into mode wider than the destination. This is not needed. Consider, for instance conversion from SFmode into DImode. The hot path through the code is dealing with inputs smaller than 2^63 and doing just the conversion, so there is no bits to lose. In the other path we know the value is positive in the range 2^63..2^64-1 inclusive. (as for other imput overflow happens and result is undefined) So we know that the most important bit set in mantissa corresponds to 2^63. The subtraction of 2^63 should not generate any rounding as it simply clears out that bit. The rest is trivial. */ if (unsignedp && GET_MODE_BITSIZE (GET_MODE (to)) <= HOST_BITS_PER_WIDE_INT) for (fmode = GET_MODE (from); fmode != VOIDmode; fmode = GET_MODE_WIDER_MODE (fmode)) if (CODE_FOR_nothing != can_fix_p (GET_MODE (to), fmode, 0, &must_trunc)) { int bitsize; REAL_VALUE_TYPE offset; rtx limit, lab1, lab2, insn; bitsize = GET_MODE_BITSIZE (GET_MODE (to)); real_2expN (&offset, bitsize - 1); limit = CONST_DOUBLE_FROM_REAL_VALUE (offset, fmode); lab1 = gen_label_rtx (); lab2 = gen_label_rtx (); if (fmode != GET_MODE (from)) from = convert_to_mode (fmode, from, 0); /* See if we need to do the subtraction. */ do_pending_stack_adjust (); emit_cmp_and_jump_insns (from, limit, GE, NULL_RTX, GET_MODE (from), 0, lab1); /* If not, do the signed "fix" and branch around fixup code. */ expand_fix (to, from, 0); emit_jump_insn (gen_jump (lab2)); emit_barrier (); /* Otherwise, subtract 2**(N-1), convert to signed number, then add 2**(N-1). Do the addition using XOR since this will often generate better code. */ emit_label (lab1); target = expand_binop (GET_MODE (from), sub_optab, from, limit, NULL_RTX, 0, OPTAB_LIB_WIDEN); expand_fix (to, target, 0); target = expand_binop (GET_MODE (to), xor_optab, to, gen_int_mode ((HOST_WIDE_INT) 1 << (bitsize - 1), GET_MODE (to)), to, 1, OPTAB_LIB_WIDEN); if (target != to) emit_move_insn (to, target); emit_label (lab2); if (mov_optab->handlers[(int) GET_MODE (to)].insn_code != CODE_FOR_nothing) { /* Make a place for a REG_NOTE and add it. */ insn = emit_move_insn (to, to); set_unique_reg_note (insn, REG_EQUAL, gen_rtx_fmt_e (UNSIGNED_FIX, GET_MODE (to), copy_rtx (from))); } return; } /* We can't do it with an insn, so use a library call. But first ensure that the mode of TO is at least as wide as SImode, since those are the only library calls we know about. */ if (GET_MODE_SIZE (GET_MODE (to)) < GET_MODE_SIZE (SImode)) { target = gen_reg_rtx (SImode); expand_fix (target, from, unsignedp); } else { rtx insns; rtx value; rtx libfunc; convert_optab tab = unsignedp ? ufix_optab : sfix_optab; libfunc = tab->handlers[GET_MODE (to)][GET_MODE (from)].libfunc; gcc_assert (libfunc); start_sequence (); value = emit_library_call_value (libfunc, NULL_RTX, LCT_CONST, GET_MODE (to), 1, from, GET_MODE (from)); insns = get_insns (); end_sequence (); emit_libcall_block (insns, target, value, gen_rtx_fmt_e (unsignedp ? UNSIGNED_FIX : FIX, GET_MODE (to), from)); } if (target != to) { if (GET_MODE (to) == GET_MODE (target)) emit_move_insn (to, target); else convert_move (to, target, 0); } } /* Report whether we have an instruction to perform the operation specified by CODE on operands of mode MODE. */ int have_insn_for (enum rtx_code code, enum machine_mode mode) { return (code_to_optab[(int) code] != 0 && (code_to_optab[(int) code]->handlers[(int) mode].insn_code != CODE_FOR_nothing)); } /* Create a blank optab. */ static optab new_optab (void) { int i; optab op = ggc_alloc (sizeof (struct optab)); for (i = 0; i < NUM_MACHINE_MODES; i++) { op->handlers[i].insn_code = CODE_FOR_nothing; op->handlers[i].libfunc = 0; } return op; } static convert_optab new_convert_optab (void) { int i, j; convert_optab op = ggc_alloc (sizeof (struct convert_optab)); for (i = 0; i < NUM_MACHINE_MODES; i++) for (j = 0; j < NUM_MACHINE_MODES; j++) { op->handlers[i][j].insn_code = CODE_FOR_nothing; op->handlers[i][j].libfunc = 0; } return op; } /* Same, but fill in its code as CODE, and write it into the code_to_optab table. */ static inline optab init_optab (enum rtx_code code) { optab op = new_optab (); op->code = code; code_to_optab[(int) code] = op; return op; } /* Same, but fill in its code as CODE, and do _not_ write it into the code_to_optab table. */ static inline optab init_optabv (enum rtx_code code) { optab op = new_optab (); op->code = code; return op; } /* Conversion optabs never go in the code_to_optab table. */ static inline convert_optab init_convert_optab (enum rtx_code code) { convert_optab op = new_convert_optab (); op->code = code; return op; } /* Initialize the libfunc fields of an entire group of entries in some optab. Each entry is set equal to a string consisting of a leading pair of underscores followed by a generic operation name followed by a mode name (downshifted to lowercase) followed by a single character representing the number of operands for the given operation (which is usually one of the characters '2', '3', or '4'). OPTABLE is the table in which libfunc fields are to be initialized. FIRST_MODE is the first machine mode index in the given optab to initialize. LAST_MODE is the last machine mode index in the given optab to initialize. OPNAME is the generic (string) name of the operation. SUFFIX is the character which specifies the number of operands for the given generic operation. */ static void init_libfuncs (optab optable, int first_mode, int last_mode, const char *opname, int suffix) { int mode; unsigned opname_len = strlen (opname); for (mode = first_mode; (int) mode <= (int) last_mode; mode = (enum machine_mode) ((int) mode + 1)) { const char *mname = GET_MODE_NAME (mode); unsigned mname_len = strlen (mname); char *libfunc_name = alloca (2 + opname_len + mname_len + 1 + 1); char *p; const char *q; p = libfunc_name; *p++ = '_'; *p++ = '_'; for (q = opname; *q; ) *p++ = *q++; for (q = mname; *q; q++) *p++ = TOLOWER (*q); *p++ = suffix; *p = '\0'; optable->handlers[(int) mode].libfunc = init_one_libfunc (ggc_alloc_string (libfunc_name, p - libfunc_name)); } } /* Initialize the libfunc fields of an entire group of entries in some optab which correspond to all integer mode operations. The parameters have the same meaning as similarly named ones for the `init_libfuncs' routine. (See above). */ static void init_integral_libfuncs (optab optable, const char *opname, int suffix) { int maxsize = 2*BITS_PER_WORD; if (maxsize < LONG_LONG_TYPE_SIZE) maxsize = LONG_LONG_TYPE_SIZE; init_libfuncs (optable, word_mode, mode_for_size (maxsize, MODE_INT, 0), opname, suffix); } /* Initialize the libfunc fields of an entire group of entries in some optab which correspond to all real mode operations. The parameters have the same meaning as similarly named ones for the `init_libfuncs' routine. (See above). */ static void init_floating_libfuncs (optab optable, const char *opname, int suffix) { init_libfuncs (optable, MIN_MODE_FLOAT, MAX_MODE_FLOAT, opname, suffix); init_libfuncs (optable, MIN_MODE_DECIMAL_FLOAT, MAX_MODE_DECIMAL_FLOAT, opname, suffix); } /* Initialize the libfunc fields of an entire group of entries of an inter-mode-class conversion optab. The string formation rules are similar to the ones for init_libfuncs, above, but instead of having a mode name and an operand count these functions have two mode names and no operand count. */ static void init_interclass_conv_libfuncs (convert_optab tab, const char *opname, enum mode_class from_class, enum mode_class to_class) { enum machine_mode first_from_mode = GET_CLASS_NARROWEST_MODE (from_class); enum machine_mode first_to_mode = GET_CLASS_NARROWEST_MODE (to_class); size_t opname_len = strlen (opname); size_t max_mname_len = 0; enum machine_mode fmode, tmode; const char *fname, *tname; const char *q; char *libfunc_name, *suffix; char *p; for (fmode = first_from_mode; fmode != VOIDmode; fmode = GET_MODE_WIDER_MODE (fmode)) max_mname_len = MAX (max_mname_len, strlen (GET_MODE_NAME (fmode))); for (tmode = first_to_mode; tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode)) max_mname_len = MAX (max_mname_len, strlen (GET_MODE_NAME (tmode))); libfunc_name = alloca (2 + opname_len + 2*max_mname_len + 1 + 1); libfunc_name[0] = '_'; libfunc_name[1] = '_'; memcpy (&libfunc_name[2], opname, opname_len); suffix = libfunc_name + opname_len + 2; for (fmode = first_from_mode; fmode != VOIDmode; fmode = GET_MODE_WIDER_MODE (fmode)) for (tmode = first_to_mode; tmode != VOIDmode; tmode = GET_MODE_WIDER_MODE (tmode)) { fname = GET_MODE_NAME (fmode); tname = GET_MODE_NAME (tmode); p = suffix; for (q = fname; *q; p++, q++) *p = TOLOWER (*q); for (q = tname; *q; p++, q++) *p = TOLOWER (*q); *p = '\0'; tab->handlers[tmode][fmode].libfunc = init_one_libfunc (ggc_alloc_string (libfunc_name, p - libfunc_name)); } } /* Initialize the libfunc fields of an entire group of entries of an intra-mode-class conversion optab. The string formation rules are similar to the ones for init_libfunc, above. WIDENING says whether the optab goes from narrow to wide modes or vice versa. These functions have two mode names _and_ an operand count. */ static void init_intraclass_conv_libfuncs (convert_optab tab, const char *opname, enum mode_class class, bool widening) { enum machine_mode first_mode = GET_CLASS_NARROWEST_MODE (class); size_t opname_len = strlen (opname); size_t max_mname_len = 0; enum machine_mode nmode, wmode; const char *nname, *wname; const char *q; char *libfunc_name, *suffix; char *p; for (nmode = first_mode; nmode != VOIDmode; nmode = GET_MODE_WIDER_MODE (nmode)) max_mname_len = MAX (max_mname_len, strlen (GET_MODE_NAME (nmode))); libfunc_name = alloca (2 + opname_len + 2*max_mname_len + 1 + 1); libfunc_name[0] = '_'; libfunc_name[1] = '_'; memcpy (&libfunc_name[2], opname, opname_len); suffix = libfunc_name + opname_len + 2; for (nmode = first_mode; nmode != VOIDmode; nmode = GET_MODE_WIDER_MODE (nmode)) for (wmode = GET_MODE_WIDER_MODE (nmode); wmode != VOIDmode; wmode = GET_MODE_WIDER_MODE (wmode)) { nname = GET_MODE_NAME (nmode); wname = GET_MODE_NAME (wmode); p = suffix; for (q = widening ? nname : wname; *q; p++, q++) *p = TOLOWER (*q); for (q = widening ? wname : nname; *q; p++, q++) *p = TOLOWER (*q); *p++ = '2'; *p = '\0'; tab->handlers[widening ? wmode : nmode] [widening ? nmode : wmode].libfunc = init_one_libfunc (ggc_alloc_string (libfunc_name, p - libfunc_name)); } } rtx init_one_libfunc (const char *name) { rtx symbol; /* Create a FUNCTION_DECL that can be passed to targetm.encode_section_info. */ /* ??? We don't have any type information except for this is a function. Pretend this is "int foo()". */ tree decl = build_decl (FUNCTION_DECL, get_identifier (name), build_function_type (integer_type_node, NULL_TREE)); DECL_ARTIFICIAL (decl) = 1; DECL_EXTERNAL (decl) = 1; TREE_PUBLIC (decl) = 1; symbol = XEXP (DECL_RTL (decl), 0); /* Zap the nonsensical SYMBOL_REF_DECL for this. What we're left with are the flags assigned by targetm.encode_section_info. */ SET_SYMBOL_REF_DECL (symbol, 0); return symbol; } /* Call this to reset the function entry for one optab (OPTABLE) in mode MODE to NAME, which should be either 0 or a string constant. */ void set_optab_libfunc (optab optable, enum machine_mode mode, const char *name) { if (name) optable->handlers[mode].libfunc = init_one_libfunc (name); else optable->handlers[mode].libfunc = 0; } /* Call this to reset the function entry for one conversion optab (OPTABLE) from mode FMODE to mode TMODE to NAME, which should be either 0 or a string constant. */ void set_conv_libfunc (convert_optab optable, enum machine_mode tmode, enum machine_mode fmode, const char *name) { if (name) optable->handlers[tmode][fmode].libfunc = init_one_libfunc (name); else optable->handlers[tmode][fmode].libfunc = 0; } /* Call this once to initialize the contents of the optabs appropriately for the current target machine. */ void init_optabs (void) { unsigned int i; /* Start by initializing all tables to contain CODE_FOR_nothing. */ for (i = 0; i < NUM_RTX_CODE; i++) setcc_gen_code[i] = CODE_FOR_nothing; #ifdef HAVE_conditional_move for (i = 0; i < NUM_MACHINE_MODES; i++) movcc_gen_code[i] = CODE_FOR_nothing; #endif for (i = 0; i < NUM_MACHINE_MODES; i++) { vcond_gen_code[i] = CODE_FOR_nothing; vcondu_gen_code[i] = CODE_FOR_nothing; } add_optab = init_optab (PLUS); addv_optab = init_optabv (PLUS); sub_optab = init_optab (MINUS); subv_optab = init_optabv (MINUS); smul_optab = init_optab (MULT); smulv_optab = init_optabv (MULT); smul_highpart_optab = init_optab (UNKNOWN); umul_highpart_optab = init_optab (UNKNOWN); smul_widen_optab = init_optab (UNKNOWN); umul_widen_optab = init_optab (UNKNOWN); usmul_widen_optab = init_optab (UNKNOWN); sdiv_optab = init_optab (DIV); sdivv_optab = init_optabv (DIV); sdivmod_optab = init_optab (UNKNOWN); udiv_optab = init_optab (UDIV); udivmod_optab = init_optab (UNKNOWN); smod_optab = init_optab (MOD); umod_optab = init_optab (UMOD); fmod_optab = init_optab (UNKNOWN); drem_optab = init_optab (UNKNOWN); ftrunc_optab = init_optab (UNKNOWN); and_optab = init_optab (AND); ior_optab = init_optab (IOR); xor_optab = init_optab (XOR); ashl_optab = init_optab (ASHIFT); ashr_optab = init_optab (ASHIFTRT); lshr_optab = init_optab (LSHIFTRT); rotl_optab = init_optab (ROTATE); rotr_optab = init_optab (ROTATERT); smin_optab = init_optab (SMIN); smax_optab = init_optab (SMAX); umin_optab = init_optab (UMIN); umax_optab = init_optab (UMAX); pow_optab = init_optab (UNKNOWN); atan2_optab = init_optab (UNKNOWN); /* These three have codes assigned exclusively for the sake of have_insn_for. */ mov_optab = init_optab (SET); movstrict_optab = init_optab (STRICT_LOW_PART); cmp_optab = init_optab (COMPARE); ucmp_optab = init_optab (UNKNOWN); tst_optab = init_optab (UNKNOWN); eq_optab = init_optab (EQ); ne_optab = init_optab (NE); gt_optab = init_optab (GT); ge_optab = init_optab (GE); lt_optab = init_optab (LT); le_optab = init_optab (LE); unord_optab = init_optab (UNORDERED); neg_optab = init_optab (NEG); negv_optab = init_optabv (NEG); abs_optab = init_optab (ABS); absv_optab = init_optabv (ABS); addcc_optab = init_optab (UNKNOWN); one_cmpl_optab = init_optab (NOT); ffs_optab = init_optab (FFS); clz_optab = init_optab (CLZ); ctz_optab = init_optab (CTZ); popcount_optab = init_optab (POPCOUNT); parity_optab = init_optab (PARITY); sqrt_optab = init_optab (SQRT); floor_optab = init_optab (UNKNOWN); lfloor_optab = init_optab (UNKNOWN); ceil_optab = init_optab (UNKNOWN); lceil_optab = init_optab (UNKNOWN); round_optab = init_optab (UNKNOWN); btrunc_optab = init_optab (UNKNOWN); nearbyint_optab = init_optab (UNKNOWN); rint_optab = init_optab (UNKNOWN); lrint_optab = init_optab (UNKNOWN); sincos_optab = init_optab (UNKNOWN); sin_optab = init_optab (UNKNOWN); asin_optab = init_optab (UNKNOWN); cos_optab = init_optab (UNKNOWN); acos_optab = init_optab (UNKNOWN); exp_optab = init_optab (UNKNOWN); exp10_optab = init_optab (UNKNOWN); exp2_optab = init_optab (UNKNOWN); expm1_optab = init_optab (UNKNOWN); ldexp_optab = init_optab (UNKNOWN); logb_optab = init_optab (UNKNOWN); ilogb_optab = init_optab (UNKNOWN); log_optab = init_optab (UNKNOWN); log10_optab = init_optab (UNKNOWN); log2_optab = init_optab (UNKNOWN); log1p_optab = init_optab (UNKNOWN); tan_optab = init_optab (UNKNOWN); atan_optab = init_optab (UNKNOWN); copysign_optab = init_optab (UNKNOWN); strlen_optab = init_optab (UNKNOWN); cbranch_optab = init_optab (UNKNOWN); cmov_optab = init_optab (UNKNOWN); cstore_optab = init_optab (UNKNOWN); push_optab = init_optab (UNKNOWN); reduc_smax_optab = init_optab (UNKNOWN); reduc_umax_optab = init_optab (UNKNOWN); reduc_smin_optab = init_optab (UNKNOWN); reduc_umin_optab = init_optab (UNKNOWN); reduc_splus_optab = init_optab (UNKNOWN); reduc_uplus_optab = init_optab (UNKNOWN); ssum_widen_optab = init_optab (UNKNOWN); usum_widen_optab = init_optab (UNKNOWN); sdot_prod_optab = init_optab (UNKNOWN); udot_prod_optab = init_optab (UNKNOWN); vec_extract_optab = init_optab (UNKNOWN); vec_set_optab = init_optab (UNKNOWN); vec_init_optab = init_optab (UNKNOWN); vec_shl_optab = init_optab (UNKNOWN); vec_shr_optab = init_optab (UNKNOWN); vec_realign_load_optab = init_optab (UNKNOWN); movmisalign_optab = init_optab (UNKNOWN); powi_optab = init_optab (UNKNOWN); /* Conversions. */ sext_optab = init_convert_optab (SIGN_EXTEND); zext_optab = init_convert_optab (ZERO_EXTEND); trunc_optab = init_convert_optab (TRUNCATE); sfix_optab = init_convert_optab (FIX); ufix_optab = init_convert_optab (UNSIGNED_FIX); sfixtrunc_optab = init_convert_optab (UNKNOWN); ufixtrunc_optab = init_convert_optab (UNKNOWN); sfloat_optab = init_convert_optab (FLOAT); ufloat_optab = init_convert_optab (UNSIGNED_FLOAT); for (i = 0; i < NUM_MACHINE_MODES; i++) { movmem_optab[i] = CODE_FOR_nothing; cmpstr_optab[i] = CODE_FOR_nothing; cmpstrn_optab[i] = CODE_FOR_nothing; cmpmem_optab[i] = CODE_FOR_nothing; setmem_optab[i] = CODE_FOR_nothing; sync_add_optab[i] = CODE_FOR_nothing; sync_sub_optab[i] = CODE_FOR_nothing; sync_ior_optab[i] = CODE_FOR_nothing; sync_and_optab[i] = CODE_FOR_nothing; sync_xor_optab[i] = CODE_FOR_nothing; sync_nand_optab[i] = CODE_FOR_nothing; sync_old_add_optab[i] = CODE_FOR_nothing; sync_old_sub_optab[i] = CODE_FOR_nothing; sync_old_ior_optab[i] = CODE_FOR_nothing; sync_old_and_optab[i] = CODE_FOR_nothing; sync_old_xor_optab[i] = CODE_FOR_nothing; sync_old_nand_optab[i] = CODE_FOR_nothing; sync_new_add_optab[i] = CODE_FOR_nothing; sync_new_sub_optab[i] = CODE_FOR_nothing; sync_new_ior_optab[i] = CODE_FOR_nothing; sync_new_and_optab[i] = CODE_FOR_nothing; sync_new_xor_optab[i] = CODE_FOR_nothing; sync_new_nand_optab[i] = CODE_FOR_nothing; sync_compare_and_swap[i] = CODE_FOR_nothing; sync_compare_and_swap_cc[i] = CODE_FOR_nothing; sync_lock_test_and_set[i] = CODE_FOR_nothing; sync_lock_release[i] = CODE_FOR_nothing; reload_in_optab[i] = reload_out_optab[i] = CODE_FOR_nothing; } /* Fill in the optabs with the insns we support. */ init_all_optabs (); /* Initialize the optabs with the names of the library functions. */ init_integral_libfuncs (add_optab, "add", '3'); init_floating_libfuncs (add_optab, "add", '3'); init_integral_libfuncs (addv_optab, "addv", '3'); init_floating_libfuncs (addv_optab, "add", '3'); init_integral_libfuncs (sub_optab, "sub", '3'); init_floating_libfuncs (sub_optab, "sub", '3'); init_integral_libfuncs (subv_optab, "subv", '3'); init_floating_libfuncs (subv_optab, "sub", '3'); init_integral_libfuncs (smul_optab, "mul", '3'); init_floating_libfuncs (smul_optab, "mul", '3'); init_integral_libfuncs (smulv_optab, "mulv", '3'); init_floating_libfuncs (smulv_optab, "mul", '3'); init_integral_libfuncs (sdiv_optab, "div", '3'); init_floating_libfuncs (sdiv_optab, "div", '3'); init_integral_libfuncs (sdivv_optab, "divv", '3'); init_integral_libfuncs (udiv_optab, "udiv", '3'); init_integral_libfuncs (sdivmod_optab, "divmod", '4'); init_integral_libfuncs (udivmod_optab, "udivmod", '4'); init_integral_libfuncs (smod_optab, "mod", '3'); init_integral_libfuncs (umod_optab, "umod", '3'); init_floating_libfuncs (ftrunc_optab, "ftrunc", '2'); init_integral_libfuncs (and_optab, "and", '3'); init_integral_libfuncs (ior_optab, "ior", '3'); init_integral_libfuncs (xor_optab, "xor", '3'); init_integral_libfuncs (ashl_optab, "ashl", '3'); init_integral_libfuncs (ashr_optab, "ashr", '3'); init_integral_libfuncs (lshr_optab, "lshr", '3'); init_integral_libfuncs (smin_optab, "min", '3'); init_floating_libfuncs (smin_optab, "min", '3'); init_integral_libfuncs (smax_optab, "max", '3'); init_floating_libfuncs (smax_optab, "max", '3'); init_integral_libfuncs (umin_optab, "umin", '3'); init_integral_libfuncs (umax_optab, "umax", '3'); init_integral_libfuncs (neg_optab, "neg", '2'); init_floating_libfuncs (neg_optab, "neg", '2'); init_integral_libfuncs (negv_optab, "negv", '2'); init_floating_libfuncs (negv_optab, "neg", '2'); init_integral_libfuncs (one_cmpl_optab, "one_cmpl", '2'); init_integral_libfuncs (ffs_optab, "ffs", '2'); init_integral_libfuncs (clz_optab, "clz", '2'); init_integral_libfuncs (ctz_optab, "ctz", '2'); init_integral_libfuncs (popcount_optab, "popcount", '2'); init_integral_libfuncs (parity_optab, "parity", '2'); /* Comparison libcalls for integers MUST come in pairs, signed/unsigned. */ init_integral_libfuncs (cmp_optab, "cmp", '2'); init_integral_libfuncs (ucmp_optab, "ucmp", '2'); init_floating_libfuncs (cmp_optab, "cmp", '2'); /* EQ etc are floating point only. */ init_floating_libfuncs (eq_optab, "eq", '2'); init_floating_libfuncs (ne_optab, "ne", '2'); init_floating_libfuncs (gt_optab, "gt", '2'); init_floating_libfuncs (ge_optab, "ge", '2'); init_floating_libfuncs (lt_optab, "lt", '2'); init_floating_libfuncs (le_optab, "le", '2'); init_floating_libfuncs (unord_optab, "unord", '2'); init_floating_libfuncs (powi_optab, "powi", '2'); /* Conversions. */ init_interclass_conv_libfuncs (sfloat_optab, "float", MODE_INT, MODE_FLOAT); init_interclass_conv_libfuncs (sfloat_optab, "float", MODE_INT, MODE_DECIMAL_FLOAT); init_interclass_conv_libfuncs (ufloat_optab, "floatun", MODE_INT, MODE_FLOAT); init_interclass_conv_libfuncs (ufloat_optab, "floatun", MODE_INT, MODE_DECIMAL_FLOAT); init_interclass_conv_libfuncs (sfix_optab, "fix", MODE_FLOAT, MODE_INT); init_interclass_conv_libfuncs (sfix_optab, "fix", MODE_DECIMAL_FLOAT, MODE_INT); init_interclass_conv_libfuncs (ufix_optab, "fixuns", MODE_FLOAT, MODE_INT); init_interclass_conv_libfuncs (ufix_optab, "fixuns", MODE_DECIMAL_FLOAT, MODE_INT); init_interclass_conv_libfuncs (ufloat_optab, "floatuns", MODE_INT, MODE_DECIMAL_FLOAT); /* sext_optab is also used for FLOAT_EXTEND. */ init_intraclass_conv_libfuncs (sext_optab, "extend", MODE_FLOAT, true); init_intraclass_conv_libfuncs (sext_optab, "extend", MODE_DECIMAL_FLOAT, true); init_interclass_conv_libfuncs (sext_optab, "extend", MODE_FLOAT, MODE_DECIMAL_FLOAT); init_interclass_conv_libfuncs (sext_optab, "extend", MODE_DECIMAL_FLOAT, MODE_FLOAT); init_intraclass_conv_libfuncs (trunc_optab, "trunc", MODE_FLOAT, false); init_intraclass_conv_libfuncs (trunc_optab, "trunc", MODE_DECIMAL_FLOAT, false); init_interclass_conv_libfuncs (trunc_optab, "trunc", MODE_FLOAT, MODE_DECIMAL_FLOAT); init_interclass_conv_libfuncs (trunc_optab, "trunc", MODE_DECIMAL_FLOAT, MODE_FLOAT); /* Use cabs for double complex abs, since systems generally have cabs. Don't define any libcall for float complex, so that cabs will be used. */ if (complex_double_type_node) abs_optab->handlers[TYPE_MODE (complex_double_type_node)].libfunc = init_one_libfunc ("cabs"); /* The ffs function operates on `int'. */ ffs_optab->handlers[(int) mode_for_size (INT_TYPE_SIZE, MODE_INT, 0)].libfunc = init_one_libfunc ("ffs"); abort_libfunc = init_one_libfunc ("abort"); memcpy_libfunc = init_one_libfunc ("memcpy"); memmove_libfunc = init_one_libfunc ("memmove"); memcmp_libfunc = init_one_libfunc ("memcmp"); memset_libfunc = init_one_libfunc ("memset"); setbits_libfunc = init_one_libfunc ("__setbits"); #ifndef DONT_USE_BUILTIN_SETJMP setjmp_libfunc = init_one_libfunc ("__builtin_setjmp"); longjmp_libfunc = init_one_libfunc ("__builtin_longjmp"); #else setjmp_libfunc = init_one_libfunc ("setjmp"); longjmp_libfunc = init_one_libfunc ("longjmp"); #endif unwind_sjlj_register_libfunc = init_one_libfunc ("_Unwind_SjLj_Register"); unwind_sjlj_unregister_libfunc = init_one_libfunc ("_Unwind_SjLj_Unregister"); /* For function entry/exit instrumentation. */ profile_function_entry_libfunc = init_one_libfunc ("__cyg_profile_func_enter"); profile_function_exit_libfunc = init_one_libfunc ("__cyg_profile_func_exit"); gcov_flush_libfunc = init_one_libfunc ("__gcov_flush"); if (HAVE_conditional_trap) trap_rtx = gen_rtx_fmt_ee (EQ, VOIDmode, NULL_RTX, NULL_RTX); /* Allow the target to add more libcalls or rename some, etc. */ targetm.init_libfuncs (); } #ifdef DEBUG /* Print information about the current contents of the optabs on STDERR. */ static void debug_optab_libfuncs (void) { int i; int j; int k; /* Dump the arithmetic optabs. */ for (i = 0; i != (int) OTI_MAX; i++) for (j = 0; j < NUM_MACHINE_MODES; ++j) { optab o; struct optab_handlers *h; o = optab_table[i]; h = &o->handlers[j]; if (h->libfunc) { gcc_assert (GET_CODE (h->libfunc) = SYMBOL_REF); fprintf (stderr, "%s\t%s:\t%s\n", GET_RTX_NAME (o->code), GET_MODE_NAME (j), XSTR (h->libfunc, 0)); } } /* Dump the conversion optabs. */ for (i = 0; i < (int) COI_MAX; ++i) for (j = 0; j < NUM_MACHINE_MODES; ++j) for (k = 0; k < NUM_MACHINE_MODES; ++k) { convert_optab o; struct optab_handlers *h; o = &convert_optab_table[i]; h = &o->handlers[j][k]; if (h->libfunc) { gcc_assert (GET_CODE (h->libfunc) = SYMBOL_REF); fprintf (stderr, "%s\t%s\t%s:\t%s\n", GET_RTX_NAME (o->code), GET_MODE_NAME (j), GET_MODE_NAME (k), XSTR (h->libfunc, 0)); } } } #endif /* DEBUG */ /* Generate insns to trap with code TCODE if OP1 and OP2 satisfy condition CODE. Return 0 on failure. */ rtx gen_cond_trap (enum rtx_code code ATTRIBUTE_UNUSED, rtx op1, rtx op2 ATTRIBUTE_UNUSED, rtx tcode ATTRIBUTE_UNUSED) { enum machine_mode mode = GET_MODE (op1); enum insn_code icode; rtx insn; if (!HAVE_conditional_trap) return 0; if (mode == VOIDmode) return 0; icode = cmp_optab->handlers[(int) mode].insn_code; if (icode == CODE_FOR_nothing) return 0; start_sequence (); op1 = prepare_operand (icode, op1, 0, mode, mode, 0); op2 = prepare_operand (icode, op2, 1, mode, mode, 0); if (!op1 || !op2) { end_sequence (); return 0; } emit_insn (GEN_FCN (icode) (op1, op2)); PUT_CODE (trap_rtx, code); gcc_assert (HAVE_conditional_trap); insn = gen_conditional_trap (trap_rtx, tcode); if (insn) { emit_insn (insn); insn = get_insns (); } end_sequence (); return insn; } /* Return rtx code for TCODE. Use UNSIGNEDP to select signed or unsigned operation code. */ static enum rtx_code get_rtx_code (enum tree_code tcode, bool unsignedp) { enum rtx_code code; switch (tcode) { case EQ_EXPR: code = EQ; break; case NE_EXPR: code = NE; break; case LT_EXPR: code = unsignedp ? LTU : LT; break; case LE_EXPR: code = unsignedp ? LEU : LE; break; case GT_EXPR: code = unsignedp ? GTU : GT; break; case GE_EXPR: code = unsignedp ? GEU : GE; break; case UNORDERED_EXPR: code = UNORDERED; break; case ORDERED_EXPR: code = ORDERED; break; case UNLT_EXPR: code = UNLT; break; case UNLE_EXPR: code = UNLE; break; case UNGT_EXPR: code = UNGT; break; case UNGE_EXPR: code = UNGE; break; case UNEQ_EXPR: code = UNEQ; break; case LTGT_EXPR: code = LTGT; break; default: gcc_unreachable (); } return code; } /* Return comparison rtx for COND. Use UNSIGNEDP to select signed or unsigned operators. Do not generate compare instruction. */ static rtx vector_compare_rtx (tree cond, bool unsignedp, enum insn_code icode) { enum rtx_code rcode; tree t_op0, t_op1; rtx rtx_op0, rtx_op1; /* This is unlikely. While generating VEC_COND_EXPR, auto vectorizer ensures that condition is a relational operation. */ gcc_assert (COMPARISON_CLASS_P (cond)); rcode = get_rtx_code (TREE_CODE (cond), unsignedp); t_op0 = TREE_OPERAND (cond, 0); t_op1 = TREE_OPERAND (cond, 1); /* Expand operands. */ rtx_op0 = expand_expr (t_op0, NULL_RTX, TYPE_MODE (TREE_TYPE (t_op0)), 1); rtx_op1 = expand_expr (t_op1, NULL_RTX, TYPE_MODE (TREE_TYPE (t_op1)), 1); if (!insn_data[icode].operand[4].predicate (rtx_op0, GET_MODE (rtx_op0)) && GET_MODE (rtx_op0) != VOIDmode) rtx_op0 = force_reg (GET_MODE (rtx_op0), rtx_op0); if (!insn_data[icode].operand[5].predicate (rtx_op1, GET_MODE (rtx_op1)) && GET_MODE (rtx_op1) != VOIDmode) rtx_op1 = force_reg (GET_MODE (rtx_op1), rtx_op1); return gen_rtx_fmt_ee (rcode, VOIDmode, rtx_op0, rtx_op1); } /* Return insn code for VEC_COND_EXPR EXPR. */ static inline enum insn_code get_vcond_icode (tree expr, enum machine_mode mode) { enum insn_code icode = CODE_FOR_nothing; if (TYPE_UNSIGNED (TREE_TYPE (expr))) icode = vcondu_gen_code[mode]; else icode = vcond_gen_code[mode]; return icode; } /* Return TRUE iff, appropriate vector insns are available for vector cond expr expr in VMODE mode. */ bool expand_vec_cond_expr_p (tree expr, enum machine_mode vmode) { if (get_vcond_icode (expr, vmode) == CODE_FOR_nothing) return false; return true; } /* Generate insns for VEC_COND_EXPR. */ rtx expand_vec_cond_expr (tree vec_cond_expr, rtx target) { enum insn_code icode; rtx comparison, rtx_op1, rtx_op2, cc_op0, cc_op1; enum machine_mode mode = TYPE_MODE (TREE_TYPE (vec_cond_expr)); bool unsignedp = TYPE_UNSIGNED (TREE_TYPE (vec_cond_expr)); icode = get_vcond_icode (vec_cond_expr, mode); if (icode == CODE_FOR_nothing) return 0; if (!target || !insn_data[icode].operand[0].predicate (target, mode)) target = gen_reg_rtx (mode); /* Get comparison rtx. First expand both cond expr operands. */ comparison = vector_compare_rtx (TREE_OPERAND (vec_cond_expr, 0), unsignedp, icode); cc_op0 = XEXP (comparison, 0); cc_op1 = XEXP (comparison, 1); /* Expand both operands and force them in reg, if required. */ rtx_op1 = expand_expr (TREE_OPERAND (vec_cond_expr, 1), NULL_RTX, VOIDmode, EXPAND_NORMAL); if (!insn_data[icode].operand[1].predicate (rtx_op1, mode) && mode != VOIDmode) rtx_op1 = force_reg (mode, rtx_op1); rtx_op2 = expand_expr (TREE_OPERAND (vec_cond_expr, 2), NULL_RTX, VOIDmode, EXPAND_NORMAL); if (!insn_data[icode].operand[2].predicate (rtx_op2, mode) && mode != VOIDmode) rtx_op2 = force_reg (mode, rtx_op2); /* Emit instruction! */ emit_insn (GEN_FCN (icode) (target, rtx_op1, rtx_op2, comparison, cc_op0, cc_op1)); return target; } /* This is an internal subroutine of the other compare_and_swap expanders. MEM, OLD_VAL and NEW_VAL are as you'd expect for a compare-and-swap operation. TARGET is an optional place to store the value result of the operation. ICODE is the particular instruction to expand. Return the result of the operation. */ static rtx expand_val_compare_and_swap_1 (rtx mem, rtx old_val, rtx new_val, rtx target, enum insn_code icode) { enum machine_mode mode = GET_MODE (mem); rtx insn; if (!target || !insn_data[icode].operand[0].predicate (target, mode)) target = gen_reg_rtx (mode); if (GET_MODE (old_val) != VOIDmode && GET_MODE (old_val) != mode) old_val = convert_modes (mode, GET_MODE (old_val), old_val, 1); if (!insn_data[icode].operand[2].predicate (old_val, mode)) old_val = force_reg (mode, old_val); if (GET_MODE (new_val) != VOIDmode && GET_MODE (new_val) != mode) new_val = convert_modes (mode, GET_MODE (new_val), new_val, 1); if (!insn_data[icode].operand[3].predicate (new_val, mode)) new_val = force_reg (mode, new_val); insn = GEN_FCN (icode) (target, mem, old_val, new_val); if (insn == NULL_RTX) return NULL_RTX; emit_insn (insn); return target; } /* Expand a compare-and-swap operation and return its value. */ rtx expand_val_compare_and_swap (rtx mem, rtx old_val, rtx new_val, rtx target) { enum machine_mode mode = GET_MODE (mem); enum insn_code icode = sync_compare_and_swap[mode]; if (icode == CODE_FOR_nothing) return NULL_RTX; return expand_val_compare_and_swap_1 (mem, old_val, new_val, target, icode); } /* Expand a compare-and-swap operation and store true into the result if the operation was successful and false otherwise. Return the result. Unlike other routines, TARGET is not optional. */ rtx expand_bool_compare_and_swap (rtx mem, rtx old_val, rtx new_val, rtx target) { enum machine_mode mode = GET_MODE (mem); enum insn_code icode; rtx subtarget, label0, label1; /* If the target supports a compare-and-swap pattern that simultaneously sets some flag for success, then use it. Otherwise use the regular compare-and-swap and follow that immediately with a compare insn. */ icode = sync_compare_and_swap_cc[mode]; switch (icode) { default: subtarget = expand_val_compare_and_swap_1 (mem, old_val, new_val, NULL_RTX, icode); if (subtarget != NULL_RTX) break; /* FALLTHRU */ case CODE_FOR_nothing: icode = sync_compare_and_swap[mode]; if (icode == CODE_FOR_nothing) return NULL_RTX; /* Ensure that if old_val == mem, that we're not comparing against an old value. */ if (MEM_P (old_val)) old_val = force_reg (mode, old_val); subtarget = expand_val_compare_and_swap_1 (mem, old_val, new_val, NULL_RTX, icode); if (subtarget == NULL_RTX) return NULL_RTX; emit_cmp_insn (subtarget, old_val, EQ, const0_rtx, mode, true); } /* If the target has a sane STORE_FLAG_VALUE, then go ahead and use a setcc instruction from the beginning. We don't work too hard here, but it's nice to not be stupid about initial code gen either. */ if (STORE_FLAG_VALUE == 1) { icode = setcc_gen_code[EQ]; if (icode != CODE_FOR_nothing) { enum machine_mode cmode = insn_data[icode].operand[0].mode; rtx insn; subtarget = target; if (!insn_data[icode].operand[0].predicate (target, cmode)) subtarget = gen_reg_rtx (cmode); insn = GEN_FCN (icode) (subtarget); if (insn) { emit_insn (insn); if (GET_MODE (target) != GET_MODE (subtarget)) { convert_move (target, subtarget, 1); subtarget = target; } return subtarget; } } } /* Without an appropriate setcc instruction, use a set of branches to get 1 and 0 stored into target. Presumably if the target has a STORE_FLAG_VALUE that isn't 1, then this will get cleaned up by ifcvt. */ label0 = gen_label_rtx (); label1 = gen_label_rtx (); emit_jump_insn (bcc_gen_fctn[EQ] (label0)); emit_move_insn (target, const0_rtx); emit_jump_insn (gen_jump (label1)); emit_barrier (); emit_label (label0); emit_move_insn (target, const1_rtx); emit_label (label1); return target; } /* This is a helper function for the other atomic operations. This function emits a loop that contains SEQ that iterates until a compare-and-swap operation at the end succeeds. MEM is the memory to be modified. SEQ is a set of instructions that takes a value from OLD_REG as an input and produces a value in NEW_REG as an output. Before SEQ, OLD_REG will be set to the current contents of MEM. After SEQ, a compare-and-swap will attempt to update MEM with NEW_REG. The function returns true when the loop was generated successfully. */ static bool expand_compare_and_swap_loop (rtx mem, rtx old_reg, rtx new_reg, rtx seq) { enum machine_mode mode = GET_MODE (mem); enum insn_code icode; rtx label, cmp_reg, subtarget; /* The loop we want to generate looks like cmp_reg = mem; label: old_reg = cmp_reg; seq; cmp_reg = compare-and-swap(mem, old_reg, new_reg) if (cmp_reg != old_reg) goto label; Note that we only do the plain load from memory once. Subsequent iterations use the value loaded by the compare-and-swap pattern. */ label = gen_label_rtx (); cmp_reg = gen_reg_rtx (mode); emit_move_insn (cmp_reg, mem); emit_label (label); emit_move_insn (old_reg, cmp_reg); if (seq) emit_insn (seq); /* If the target supports a compare-and-swap pattern that simultaneously sets some flag for success, then use it. Otherwise use the regular compare-and-swap and follow that immediately with a compare insn. */ icode = sync_compare_and_swap_cc[mode]; switch (icode) { default: subtarget = expand_val_compare_and_swap_1 (mem, old_reg, new_reg, cmp_reg, icode); if (subtarget != NULL_RTX) { gcc_assert (subtarget == cmp_reg); break; } /* FALLTHRU */ case CODE_FOR_nothing: icode = sync_compare_and_swap[mode]; if (icode == CODE_FOR_nothing) return false; subtarget = expand_val_compare_and_swap_1 (mem, old_reg, new_reg, cmp_reg, icode); if (subtarget == NULL_RTX) return false; if (subtarget != cmp_reg) emit_move_insn (cmp_reg, subtarget); emit_cmp_insn (cmp_reg, old_reg, EQ, const0_rtx, mode, true); } /* ??? Mark this jump predicted not taken? */ emit_jump_insn (bcc_gen_fctn[NE] (label)); return true; } /* This function generates the atomic operation MEM CODE= VAL. In this case, we do not care about any resulting value. Returns NULL if we cannot generate the operation. */ rtx expand_sync_operation (rtx mem, rtx val, enum rtx_code code) { enum machine_mode mode = GET_MODE (mem); enum insn_code icode; rtx insn; /* Look to see if the target supports the operation directly. */ switch (code) { case PLUS: icode = sync_add_optab[mode]; break; case IOR: icode = sync_ior_optab[mode]; break; case XOR: icode = sync_xor_optab[mode]; break; case AND: icode = sync_and_optab[mode]; break; case NOT: icode = sync_nand_optab[mode]; break; case MINUS: icode = sync_sub_optab[mode]; if (icode == CODE_FOR_nothing) { icode = sync_add_optab[mode]; if (icode != CODE_FOR_nothing) { val = expand_simple_unop (mode, NEG, val, NULL_RTX, 1); code = PLUS; } } break; default: gcc_unreachable (); } /* Generate the direct operation, if present. */ if (icode != CODE_FOR_nothing) { if (GET_MODE (val) != VOIDmode && GET_MODE (val) != mode) val = convert_modes (mode, GET_MODE (val), val, 1); if (!insn_data[icode].operand[1].predicate (val, mode)) val = force_reg (mode, val); insn = GEN_FCN (icode) (mem, val); if (insn) { emit_insn (insn); return const0_rtx; } } /* Failing that, generate a compare-and-swap loop in which we perform the operation with normal arithmetic instructions. */ if (sync_compare_and_swap[mode] != CODE_FOR_nothing) { rtx t0 = gen_reg_rtx (mode), t1; start_sequence (); t1 = t0; if (code == NOT) { t1 = expand_simple_unop (mode, NOT, t1, NULL_RTX, true); code = AND; } t1 = expand_simple_binop (mode, code, t1, val, NULL_RTX, true, OPTAB_LIB_WIDEN); insn = get_insns (); end_sequence (); if (t1 != NULL && expand_compare_and_swap_loop (mem, t0, t1, insn)) return const0_rtx; } return NULL_RTX; } /* This function generates the atomic operation MEM CODE= VAL. In this case, we do care about the resulting value: if AFTER is true then return the value MEM holds after the operation, if AFTER is false then return the value MEM holds before the operation. TARGET is an optional place for the result value to be stored. */ rtx expand_sync_fetch_operation (rtx mem, rtx val, enum rtx_code code, bool after, rtx target) { enum machine_mode mode = GET_MODE (mem); enum insn_code old_code, new_code, icode; bool compensate; rtx insn; /* Look to see if the target supports the operation directly. */ switch (code) { case PLUS: old_code = sync_old_add_optab[mode]; new_code = sync_new_add_optab[mode]; break; case IOR: old_code = sync_old_ior_optab[mode]; new_code = sync_new_ior_optab[mode]; break; case XOR: old_code = sync_old_xor_optab[mode]; new_code = sync_new_xor_optab[mode]; break; case AND: old_code = sync_old_and_optab[mode]; new_code = sync_new_and_optab[mode]; break; case NOT: old_code = sync_old_nand_optab[mode]; new_code = sync_new_nand_optab[mode]; break; case MINUS: old_code = sync_old_sub_optab[mode]; new_code = sync_new_sub_optab[mode]; if (old_code == CODE_FOR_nothing && new_code == CODE_FOR_nothing) { old_code = sync_old_add_optab[mode]; new_code = sync_new_add_optab[mode]; if (old_code != CODE_FOR_nothing || new_code != CODE_FOR_nothing) { val = expand_simple_unop (mode, NEG, val, NULL_RTX, 1); code = PLUS; } } break; default: gcc_unreachable (); } /* If the target does supports the proper new/old operation, great. But if we only support the opposite old/new operation, check to see if we can compensate. In the case in which the old value is supported, then we can always perform the operation again with normal arithmetic. In the case in which the new value is supported, then we can only handle this in the case the operation is reversible. */ compensate = false; if (after) { icode = new_code; if (icode == CODE_FOR_nothing) { icode = old_code; if (icode != CODE_FOR_nothing) compensate = true; } } else { icode = old_code; if (icode == CODE_FOR_nothing && (code == PLUS || code == MINUS || code == XOR)) { icode = new_code; if (icode != CODE_FOR_nothing) compensate = true; } } /* If we found something supported, great. */ if (icode != CODE_FOR_nothing) { if (!target || !insn_data[icode].operand[0].predicate (target, mode)) target = gen_reg_rtx (mode); if (GET_MODE (val) != VOIDmode && GET_MODE (val) != mode) val = convert_modes (mode, GET_MODE (val), val, 1); if (!insn_data[icode].operand[2].predicate (val, mode)) val = force_reg (mode, val); insn = GEN_FCN (icode) (target, mem, val); if (insn) { emit_insn (insn); /* If we need to compensate for using an operation with the wrong return value, do so now. */ if (compensate) { if (!after) { if (code == PLUS) code = MINUS; else if (code == MINUS) code = PLUS; } if (code == NOT) target = expand_simple_unop (mode, NOT, target, NULL_RTX, true); target = expand_simple_binop (mode, code, target, val, NULL_RTX, true, OPTAB_LIB_WIDEN); } return target; } } /* Failing that, generate a compare-and-swap loop in which we perform the operation with normal arithmetic instructions. */ if (sync_compare_and_swap[mode] != CODE_FOR_nothing) { rtx t0 = gen_reg_rtx (mode), t1; if (!target || !register_operand (target, mode)) target = gen_reg_rtx (mode); start_sequence (); if (!after) emit_move_insn (target, t0); t1 = t0; if (code == NOT) { t1 = expand_simple_unop (mode, NOT, t1, NULL_RTX, true); code = AND; } t1 = expand_simple_binop (mode, code, t1, val, NULL_RTX, true, OPTAB_LIB_WIDEN); if (after) emit_move_insn (target, t1); insn = get_insns (); end_sequence (); if (t1 != NULL && expand_compare_and_swap_loop (mem, t0, t1, insn)) return target; } return NULL_RTX; } /* This function expands a test-and-set operation. Ideally we atomically store VAL in MEM and return the previous value in MEM. Some targets may not support this operation and only support VAL with the constant 1; in this case while the return value will be 0/1, but the exact value stored in MEM is target defined. TARGET is an option place to stick the return value. */ rtx expand_sync_lock_test_and_set (rtx mem, rtx val, rtx target) { enum machine_mode mode = GET_MODE (mem); enum insn_code icode; rtx insn; /* If the target supports the test-and-set directly, great. */ icode = sync_lock_test_and_set[mode]; if (icode != CODE_FOR_nothing) { if (!target || !insn_data[icode].operand[0].predicate (target, mode)) target = gen_reg_rtx (mode); if (GET_MODE (val) != VOIDmode && GET_MODE (val) != mode) val = convert_modes (mode, GET_MODE (val), val, 1); if (!insn_data[icode].operand[2].predicate (val, mode)) val = force_reg (mode, val); insn = GEN_FCN (icode) (target, mem, val); if (insn) { emit_insn (insn); return target; } } /* Otherwise, use a compare-and-swap loop for the exchange. */ if (sync_compare_and_swap[mode] != CODE_FOR_nothing) { if (!target || !register_operand (target, mode)) target = gen_reg_rtx (mode); if (GET_MODE (val) != VOIDmode && GET_MODE (val) != mode) val = convert_modes (mode, GET_MODE (val), val, 1); if (expand_compare_and_swap_loop (mem, target, val, NULL_RTX)) return target; } return NULL_RTX; } #include "gt-optabs.h"