URL
https://opencores.org/ocsvn/openrisc/openrisc/trunk
Subversion Repositories openrisc
[/] [openrisc/] [trunk/] [gnu-dev/] [or1k-gcc/] [gcc/] [config/] [rx/] [rx.c] - Rev 756
Go to most recent revision | Compare with Previous | Blame | View Log
/* Subroutines used for code generation on Renesas RX processors. Copyright (C) 2008, 2009, 2010, 2011, 2012 Free Software Foundation, Inc. Contributed by Red Hat. 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/>. */ /* To Do: * Re-enable memory-to-memory copies and fix up reload. */ #include "config.h" #include "system.h" #include "coretypes.h" #include "tm.h" #include "tree.h" #include "rtl.h" #include "regs.h" #include "hard-reg-set.h" #include "insn-config.h" #include "conditions.h" #include "output.h" #include "insn-attr.h" #include "flags.h" #include "function.h" #include "expr.h" #include "optabs.h" #include "libfuncs.h" #include "recog.h" #include "diagnostic-core.h" #include "toplev.h" #include "reload.h" #include "df.h" #include "ggc.h" #include "tm_p.h" #include "debug.h" #include "target.h" #include "target-def.h" #include "langhooks.h" #include "opts.h" static unsigned int rx_gp_base_regnum_val = INVALID_REGNUM; static unsigned int rx_pid_base_regnum_val = INVALID_REGNUM; static unsigned int rx_num_interrupt_regs; static unsigned int rx_gp_base_regnum (void) { if (rx_gp_base_regnum_val == INVALID_REGNUM) gcc_unreachable (); return rx_gp_base_regnum_val; } static unsigned int rx_pid_base_regnum (void) { if (rx_pid_base_regnum_val == INVALID_REGNUM) gcc_unreachable (); return rx_pid_base_regnum_val; } /* Find a SYMBOL_REF in a "standard" MEM address and return its decl. */ static tree rx_decl_for_addr (rtx op) { if (GET_CODE (op) == MEM) op = XEXP (op, 0); if (GET_CODE (op) == CONST) op = XEXP (op, 0); while (GET_CODE (op) == PLUS) op = XEXP (op, 0); if (GET_CODE (op) == SYMBOL_REF) return SYMBOL_REF_DECL (op); return NULL_TREE; } static void rx_print_operand (FILE *, rtx, int); #define CC_FLAG_S (1 << 0) #define CC_FLAG_Z (1 << 1) #define CC_FLAG_O (1 << 2) #define CC_FLAG_C (1 << 3) #define CC_FLAG_FP (1 << 4) /* Fake, to differentiate CC_Fmode. */ static unsigned int flags_from_mode (enum machine_mode mode); static unsigned int flags_from_code (enum rtx_code code); /* Return true if OP is a reference to an object in a PID data area. */ enum pid_type { PID_NOT_PID = 0, /* The object is not in the PID data area. */ PID_ENCODED, /* The object is in the PID data area. */ PID_UNENCODED /* The object will be placed in the PID data area, but it has not been placed there yet. */ }; static enum pid_type rx_pid_data_operand (rtx op) { tree op_decl; if (!TARGET_PID) return PID_NOT_PID; if (GET_CODE (op) == PLUS && GET_CODE (XEXP (op, 0)) == REG && GET_CODE (XEXP (op, 1)) == CONST && GET_CODE (XEXP (XEXP (op, 1), 0)) == UNSPEC) return PID_ENCODED; op_decl = rx_decl_for_addr (op); if (op_decl) { if (TREE_READONLY (op_decl)) return PID_UNENCODED; } else { /* Sigh, some special cases. */ if (GET_CODE (op) == SYMBOL_REF || GET_CODE (op) == LABEL_REF) return PID_UNENCODED; } return PID_NOT_PID; } static rtx rx_legitimize_address (rtx x, rtx oldx ATTRIBUTE_UNUSED, enum machine_mode mode ATTRIBUTE_UNUSED) { if (rx_pid_data_operand (x) == PID_UNENCODED) { rtx rv = gen_pid_addr (gen_rtx_REG (SImode, rx_pid_base_regnum ()), x); return rv; } if (GET_CODE (x) == PLUS && GET_CODE (XEXP (x, 0)) == PLUS && REG_P (XEXP (XEXP (x, 0), 0)) && REG_P (XEXP (x, 1))) return force_reg (SImode, x); return x; } /* Return true if OP is a reference to an object in a small data area. */ static bool rx_small_data_operand (rtx op) { if (rx_small_data_limit == 0) return false; if (GET_CODE (op) == SYMBOL_REF) return SYMBOL_REF_SMALL_P (op); return false; } static bool rx_is_legitimate_address (enum machine_mode mode, rtx x, bool strict ATTRIBUTE_UNUSED) { if (RTX_OK_FOR_BASE (x, strict)) /* Register Indirect. */ return true; if ((GET_MODE_SIZE (mode) == 4 || GET_MODE_SIZE (mode) == 2 || GET_MODE_SIZE (mode) == 1) && (GET_CODE (x) == PRE_DEC || GET_CODE (x) == POST_INC)) /* Pre-decrement Register Indirect or Post-increment Register Indirect. */ return RTX_OK_FOR_BASE (XEXP (x, 0), strict); switch (rx_pid_data_operand (x)) { case PID_UNENCODED: return false; case PID_ENCODED: return true; default: break; } if (GET_CODE (x) == PLUS) { rtx arg1 = XEXP (x, 0); rtx arg2 = XEXP (x, 1); rtx index = NULL_RTX; if (REG_P (arg1) && RTX_OK_FOR_BASE (arg1, strict)) index = arg2; else if (REG_P (arg2) && RTX_OK_FOR_BASE (arg2, strict)) index = arg1; else return false; switch (GET_CODE (index)) { case CONST_INT: { /* Register Relative: REG + INT. Only positive, mode-aligned, mode-sized displacements are allowed. */ HOST_WIDE_INT val = INTVAL (index); int factor; if (val < 0) return false; switch (GET_MODE_SIZE (mode)) { default: case 4: factor = 4; break; case 2: factor = 2; break; case 1: factor = 1; break; } if (val > (65535 * factor)) return false; return (val % factor) == 0; } case REG: /* Unscaled Indexed Register Indirect: REG + REG Size has to be "QI", REG has to be valid. */ return GET_MODE_SIZE (mode) == 1 && RTX_OK_FOR_BASE (index, strict); case MULT: { /* Scaled Indexed Register Indirect: REG + (REG * FACTOR) Factor has to equal the mode size, REG has to be valid. */ rtx factor; factor = XEXP (index, 1); index = XEXP (index, 0); return REG_P (index) && RTX_OK_FOR_BASE (index, strict) && CONST_INT_P (factor) && GET_MODE_SIZE (mode) == INTVAL (factor); } default: return false; } } /* Small data area accesses turn into register relative offsets. */ return rx_small_data_operand (x); } /* Returns TRUE for simple memory addreses, ie ones that do not involve register indirect addressing or pre/post increment/decrement. */ bool rx_is_restricted_memory_address (rtx mem, enum machine_mode mode) { if (! rx_is_legitimate_address (mode, mem, reload_in_progress || reload_completed)) return false; switch (GET_CODE (mem)) { case REG: /* Simple memory addresses are OK. */ return true; case PRE_DEC: case POST_INC: return false; case PLUS: { rtx base, index; /* Only allow REG+INT addressing. */ base = XEXP (mem, 0); index = XEXP (mem, 1); if (! RX_REG_P (base) || ! CONST_INT_P (index)) return false; return IN_RANGE (INTVAL (index), 0, (0x10000 * GET_MODE_SIZE (mode)) - 1); } case SYMBOL_REF: /* Can happen when small data is being supported. Assume that it will be resolved into GP+INT. */ return true; default: gcc_unreachable (); } } /* Implement TARGET_MODE_DEPENDENT_ADDRESS_P. */ static bool rx_mode_dependent_address_p (const_rtx addr) { if (GET_CODE (addr) == CONST) addr = XEXP (addr, 0); switch (GET_CODE (addr)) { /* --REG and REG++ only work in SImode. */ case PRE_DEC: case POST_INC: return true; case MINUS: case PLUS: if (! REG_P (XEXP (addr, 0))) return true; addr = XEXP (addr, 1); switch (GET_CODE (addr)) { case REG: /* REG+REG only works in SImode. */ return true; case CONST_INT: /* REG+INT is only mode independent if INT is a multiple of 4, positive and will fit into 8-bits. */ if (((INTVAL (addr) & 3) == 0) && IN_RANGE (INTVAL (addr), 4, 252)) return false; return true; case SYMBOL_REF: case LABEL_REF: return true; case MULT: gcc_assert (REG_P (XEXP (addr, 0))); gcc_assert (CONST_INT_P (XEXP (addr, 1))); /* REG+REG*SCALE is always mode dependent. */ return true; default: /* Not recognized, so treat as mode dependent. */ return true; } case CONST_INT: case SYMBOL_REF: case LABEL_REF: case REG: /* These are all mode independent. */ return false; default: /* Everything else is unrecognized, so treat as mode dependent. */ return true; } } /* A C compound statement to output to stdio stream FILE the assembler syntax for an instruction operand that is a memory reference whose address is ADDR. */ static void rx_print_operand_address (FILE * file, rtx addr) { switch (GET_CODE (addr)) { case REG: fprintf (file, "["); rx_print_operand (file, addr, 0); fprintf (file, "]"); break; case PRE_DEC: fprintf (file, "[-"); rx_print_operand (file, XEXP (addr, 0), 0); fprintf (file, "]"); break; case POST_INC: fprintf (file, "["); rx_print_operand (file, XEXP (addr, 0), 0); fprintf (file, "+]"); break; case PLUS: { rtx arg1 = XEXP (addr, 0); rtx arg2 = XEXP (addr, 1); rtx base, index; if (REG_P (arg1) && RTX_OK_FOR_BASE (arg1, true)) base = arg1, index = arg2; else if (REG_P (arg2) && RTX_OK_FOR_BASE (arg2, true)) base = arg2, index = arg1; else { rx_print_operand (file, arg1, 0); fprintf (file, " + "); rx_print_operand (file, arg2, 0); break; } if (REG_P (index) || GET_CODE (index) == MULT) { fprintf (file, "["); rx_print_operand (file, index, 'A'); fprintf (file, ","); } else /* GET_CODE (index) == CONST_INT */ { rx_print_operand (file, index, 'A'); fprintf (file, "["); } rx_print_operand (file, base, 0); fprintf (file, "]"); break; } case CONST: if (GET_CODE (XEXP (addr, 0)) == UNSPEC) { addr = XEXP (addr, 0); gcc_assert (XINT (addr, 1) == UNSPEC_CONST); /* FIXME: Putting this case label here is an appalling abuse of the C language. */ case UNSPEC: addr = XVECEXP (addr, 0, 0); gcc_assert (CONST_INT_P (addr)); } /* Fall through. */ case LABEL_REF: case SYMBOL_REF: fprintf (file, "#"); /* Fall through. */ default: output_addr_const (file, addr); break; } } static void rx_print_integer (FILE * file, HOST_WIDE_INT val) { if (IN_RANGE (val, -64, 64)) fprintf (file, HOST_WIDE_INT_PRINT_DEC, val); else fprintf (file, TARGET_AS100_SYNTAX ? "0%" HOST_WIDE_INT_PRINT "xH" : HOST_WIDE_INT_PRINT_HEX, val); } static bool rx_assemble_integer (rtx x, unsigned int size, int is_aligned) { const char * op = integer_asm_op (size, is_aligned); if (! CONST_INT_P (x)) return default_assemble_integer (x, size, is_aligned); if (op == NULL) return false; fputs (op, asm_out_file); rx_print_integer (asm_out_file, INTVAL (x)); fputc ('\n', asm_out_file); return true; } /* Handles the insertion of a single operand into the assembler output. The %<letter> directives supported are: %A Print an operand without a leading # character. %B Print an integer comparison name. %C Print a control register name. %F Print a condition code flag name. %G Register used for small-data-area addressing %H Print high part of a DImode register, integer or address. %L Print low part of a DImode register, integer or address. %N Print the negation of the immediate value. %P Register used for PID addressing %Q If the operand is a MEM, then correctly generate register indirect or register relative addressing. %R Like %Q but for zero-extending loads. */ static void rx_print_operand (FILE * file, rtx op, int letter) { bool unsigned_load = false; bool print_hash = true; if (letter == 'A' && ((GET_CODE (op) == CONST && GET_CODE (XEXP (op, 0)) == UNSPEC) || GET_CODE (op) == UNSPEC)) { print_hash = false; letter = 0; } switch (letter) { case 'A': /* Print an operand without a leading #. */ if (MEM_P (op)) op = XEXP (op, 0); switch (GET_CODE (op)) { case LABEL_REF: case SYMBOL_REF: output_addr_const (file, op); break; case CONST_INT: fprintf (file, "%ld", (long) INTVAL (op)); break; default: rx_print_operand (file, op, 0); break; } break; case 'B': { enum rtx_code code = GET_CODE (op); enum machine_mode mode = GET_MODE (XEXP (op, 0)); const char *ret; if (mode == CC_Fmode) { /* C flag is undefined, and O flag carries unordered. None of the branch combinations that include O use it helpfully. */ switch (code) { case ORDERED: ret = "no"; break; case UNORDERED: ret = "o"; break; case LT: ret = "n"; break; case GE: ret = "pz"; break; case EQ: ret = "eq"; break; case NE: ret = "ne"; break; default: gcc_unreachable (); } } else { unsigned int flags = flags_from_mode (mode); switch (code) { case LT: ret = (flags & CC_FLAG_O ? "lt" : "n"); break; case GE: ret = (flags & CC_FLAG_O ? "ge" : "pz"); break; case GT: ret = "gt"; break; case LE: ret = "le"; break; case GEU: ret = "geu"; break; case LTU: ret = "ltu"; break; case GTU: ret = "gtu"; break; case LEU: ret = "leu"; break; case EQ: ret = "eq"; break; case NE: ret = "ne"; break; default: gcc_unreachable (); } gcc_checking_assert ((flags_from_code (code) & ~flags) == 0); } fputs (ret, file); break; } case 'C': gcc_assert (CONST_INT_P (op)); switch (INTVAL (op)) { case 0: fprintf (file, "psw"); break; case 2: fprintf (file, "usp"); break; case 3: fprintf (file, "fpsw"); break; case 4: fprintf (file, "cpen"); break; case 8: fprintf (file, "bpsw"); break; case 9: fprintf (file, "bpc"); break; case 0xa: fprintf (file, "isp"); break; case 0xb: fprintf (file, "fintv"); break; case 0xc: fprintf (file, "intb"); break; default: warning (0, "unrecognized control register number: %d - using 'psw'", (int) INTVAL (op)); fprintf (file, "psw"); break; } break; case 'F': gcc_assert (CONST_INT_P (op)); switch (INTVAL (op)) { case 0: case 'c': case 'C': fprintf (file, "C"); break; case 1: case 'z': case 'Z': fprintf (file, "Z"); break; case 2: case 's': case 'S': fprintf (file, "S"); break; case 3: case 'o': case 'O': fprintf (file, "O"); break; case 8: case 'i': case 'I': fprintf (file, "I"); break; case 9: case 'u': case 'U': fprintf (file, "U"); break; default: gcc_unreachable (); } break; case 'G': fprintf (file, "%s", reg_names [rx_gp_base_regnum ()]); break; case 'H': switch (GET_CODE (op)) { case REG: fprintf (file, "%s", reg_names [REGNO (op) + (WORDS_BIG_ENDIAN ? 0 : 1)]); break; case CONST_INT: { HOST_WIDE_INT v = INTVAL (op); fprintf (file, "#"); /* Trickery to avoid problems with shifting 32 bits at a time. */ v = v >> 16; v = v >> 16; rx_print_integer (file, v); break; } case CONST_DOUBLE: fprintf (file, "#"); rx_print_integer (file, CONST_DOUBLE_HIGH (op)); break; case MEM: if (! WORDS_BIG_ENDIAN) op = adjust_address (op, SImode, 4); output_address (XEXP (op, 0)); break; default: gcc_unreachable (); } break; case 'L': switch (GET_CODE (op)) { case REG: fprintf (file, "%s", reg_names [REGNO (op) + (WORDS_BIG_ENDIAN ? 1 : 0)]); break; case CONST_INT: fprintf (file, "#"); rx_print_integer (file, INTVAL (op) & 0xffffffff); break; case CONST_DOUBLE: fprintf (file, "#"); rx_print_integer (file, CONST_DOUBLE_LOW (op)); break; case MEM: if (WORDS_BIG_ENDIAN) op = adjust_address (op, SImode, 4); output_address (XEXP (op, 0)); break; default: gcc_unreachable (); } break; case 'N': gcc_assert (CONST_INT_P (op)); fprintf (file, "#"); rx_print_integer (file, - INTVAL (op)); break; case 'P': fprintf (file, "%s", reg_names [rx_pid_base_regnum ()]); break; case 'R': gcc_assert (GET_MODE_SIZE (GET_MODE (op)) < 4); unsigned_load = true; /* Fall through. */ case 'Q': if (MEM_P (op)) { HOST_WIDE_INT offset; rtx mem = op; op = XEXP (op, 0); if (REG_P (op)) offset = 0; else if (GET_CODE (op) == PLUS) { rtx displacement; if (REG_P (XEXP (op, 0))) { displacement = XEXP (op, 1); op = XEXP (op, 0); } else { displacement = XEXP (op, 0); op = XEXP (op, 1); gcc_assert (REG_P (op)); } gcc_assert (CONST_INT_P (displacement)); offset = INTVAL (displacement); gcc_assert (offset >= 0); fprintf (file, "%ld", offset); } else gcc_unreachable (); fprintf (file, "["); rx_print_operand (file, op, 0); fprintf (file, "]."); switch (GET_MODE_SIZE (GET_MODE (mem))) { case 1: gcc_assert (offset <= 65535 * 1); fprintf (file, unsigned_load ? "UB" : "B"); break; case 2: gcc_assert (offset % 2 == 0); gcc_assert (offset <= 65535 * 2); fprintf (file, unsigned_load ? "UW" : "W"); break; case 4: gcc_assert (offset % 4 == 0); gcc_assert (offset <= 65535 * 4); fprintf (file, "L"); break; default: gcc_unreachable (); } break; } /* Fall through. */ default: if (GET_CODE (op) == CONST && GET_CODE (XEXP (op, 0)) == UNSPEC) op = XEXP (op, 0); else if (GET_CODE (op) == CONST && GET_CODE (XEXP (op, 0)) == PLUS && GET_CODE (XEXP (XEXP (op, 0), 0)) == UNSPEC && GET_CODE (XEXP (XEXP (op, 0), 1)) == CONST_INT) { if (print_hash) fprintf (file, "#"); fprintf (file, "("); rx_print_operand (file, XEXP (XEXP (op, 0), 0), 'A'); fprintf (file, " + "); output_addr_const (file, XEXP (XEXP (op, 0), 1)); fprintf (file, ")"); return; } switch (GET_CODE (op)) { case MULT: /* Should be the scaled part of an indexed register indirect address. */ { rtx base = XEXP (op, 0); rtx index = XEXP (op, 1); /* Check for a swaped index register and scaling factor. Not sure if this can happen, but be prepared to handle it. */ if (CONST_INT_P (base) && REG_P (index)) { rtx tmp = base; base = index; index = tmp; } gcc_assert (REG_P (base)); gcc_assert (REGNO (base) < FIRST_PSEUDO_REGISTER); gcc_assert (CONST_INT_P (index)); /* Do not try to verify the value of the scalar as it is based on the mode of the MEM not the mode of the MULT. (Which will always be SImode). */ fprintf (file, "%s", reg_names [REGNO (base)]); break; } case MEM: output_address (XEXP (op, 0)); break; case PLUS: output_address (op); break; case REG: gcc_assert (REGNO (op) < FIRST_PSEUDO_REGISTER); fprintf (file, "%s", reg_names [REGNO (op)]); break; case SUBREG: gcc_assert (subreg_regno (op) < FIRST_PSEUDO_REGISTER); fprintf (file, "%s", reg_names [subreg_regno (op)]); break; /* This will only be single precision.... */ case CONST_DOUBLE: { unsigned long val; REAL_VALUE_TYPE rv; REAL_VALUE_FROM_CONST_DOUBLE (rv, op); REAL_VALUE_TO_TARGET_SINGLE (rv, val); if (print_hash) fprintf (file, "#"); fprintf (file, TARGET_AS100_SYNTAX ? "0%lxH" : "0x%lx", val); break; } case CONST_INT: if (print_hash) fprintf (file, "#"); rx_print_integer (file, INTVAL (op)); break; case UNSPEC: switch (XINT (op, 1)) { case UNSPEC_PID_ADDR: { rtx sym, add; if (print_hash) fprintf (file, "#"); sym = XVECEXP (op, 0, 0); add = NULL_RTX; fprintf (file, "("); if (GET_CODE (sym) == PLUS) { add = XEXP (sym, 1); sym = XEXP (sym, 0); } output_addr_const (file, sym); if (add != NULL_RTX) { fprintf (file, "+"); output_addr_const (file, add); } fprintf (file, "-__pid_base"); fprintf (file, ")"); return; } } /* Fall through */ case CONST: case SYMBOL_REF: case LABEL_REF: case CODE_LABEL: rx_print_operand_address (file, op); break; default: gcc_unreachable (); } break; } } /* Maybe convert an operand into its PID format. */ rtx rx_maybe_pidify_operand (rtx op, int copy_to_reg) { if (rx_pid_data_operand (op) == PID_UNENCODED) { if (GET_CODE (op) == MEM) { rtx a = gen_pid_addr (gen_rtx_REG (SImode, rx_pid_base_regnum ()), XEXP (op, 0)); op = replace_equiv_address (op, a); } else { op = gen_pid_addr (gen_rtx_REG (SImode, rx_pid_base_regnum ()), op); } if (copy_to_reg) op = copy_to_mode_reg (GET_MODE (op), op); } return op; } /* Returns an assembler template for a move instruction. */ char * rx_gen_move_template (rtx * operands, bool is_movu) { static char out_template [64]; const char * extension = TARGET_AS100_SYNTAX ? ".L" : ""; const char * src_template; const char * dst_template; rtx dest = operands[0]; rtx src = operands[1]; /* Decide which extension, if any, should be given to the move instruction. */ switch (CONST_INT_P (src) ? GET_MODE (dest) : GET_MODE (src)) { case QImode: /* The .B extension is not valid when loading an immediate into a register. */ if (! REG_P (dest) || ! CONST_INT_P (src)) extension = ".B"; break; case HImode: if (! REG_P (dest) || ! CONST_INT_P (src)) /* The .W extension is not valid when loading an immediate into a register. */ extension = ".W"; break; case SFmode: case SImode: extension = ".L"; break; case VOIDmode: /* This mode is used by constants. */ break; default: debug_rtx (src); gcc_unreachable (); } if (MEM_P (src) && rx_pid_data_operand (XEXP (src, 0)) == PID_UNENCODED) src_template = "(%A1-__pid_base)[%P1]"; else if (MEM_P (src) && rx_small_data_operand (XEXP (src, 0))) src_template = "%%gp(%A1)[%G1]"; else src_template = "%1"; if (MEM_P (dest) && rx_small_data_operand (XEXP (dest, 0))) dst_template = "%%gp(%A0)[%G0]"; else dst_template = "%0"; sprintf (out_template, "%s%s\t%s, %s", is_movu ? "movu" : "mov", extension, src_template, dst_template); return out_template; } /* Return VALUE rounded up to the next ALIGNMENT boundary. */ static inline unsigned int rx_round_up (unsigned int value, unsigned int alignment) { alignment -= 1; return (value + alignment) & (~ alignment); } /* Return the number of bytes in the argument registers occupied by an argument of type TYPE and mode MODE. */ static unsigned int rx_function_arg_size (enum machine_mode mode, const_tree type) { unsigned int num_bytes; num_bytes = (mode == BLKmode) ? int_size_in_bytes (type) : GET_MODE_SIZE (mode); return rx_round_up (num_bytes, UNITS_PER_WORD); } #define NUM_ARG_REGS 4 #define MAX_NUM_ARG_BYTES (NUM_ARG_REGS * UNITS_PER_WORD) /* Return an RTL expression describing the register holding a function parameter of mode MODE and type TYPE or NULL_RTX if the parameter should be passed on the stack. CUM describes the previous parameters to the function and NAMED is false if the parameter is part of a variable parameter list, or the last named parameter before the start of a variable parameter list. */ static rtx rx_function_arg (cumulative_args_t cum, enum machine_mode mode, const_tree type, bool named) { unsigned int next_reg; unsigned int bytes_so_far = *get_cumulative_args (cum); unsigned int size; unsigned int rounded_size; /* An exploded version of rx_function_arg_size. */ size = (mode == BLKmode) ? int_size_in_bytes (type) : GET_MODE_SIZE (mode); /* If the size is not known it cannot be passed in registers. */ if (size < 1) return NULL_RTX; rounded_size = rx_round_up (size, UNITS_PER_WORD); /* Don't pass this arg via registers if there are insufficient registers to hold all of it. */ if (rounded_size + bytes_so_far > MAX_NUM_ARG_BYTES) return NULL_RTX; /* Unnamed arguments and the last named argument in a variadic function are always passed on the stack. */ if (!named) return NULL_RTX; /* Structures must occupy an exact number of registers, otherwise they are passed on the stack. */ if ((type == NULL || AGGREGATE_TYPE_P (type)) && (size % UNITS_PER_WORD) != 0) return NULL_RTX; next_reg = (bytes_so_far / UNITS_PER_WORD) + 1; return gen_rtx_REG (mode, next_reg); } static void rx_function_arg_advance (cumulative_args_t cum, enum machine_mode mode, const_tree type, bool named ATTRIBUTE_UNUSED) { *get_cumulative_args (cum) += rx_function_arg_size (mode, type); } static unsigned int rx_function_arg_boundary (enum machine_mode mode ATTRIBUTE_UNUSED, const_tree type ATTRIBUTE_UNUSED) { return 32; } /* Return an RTL describing where a function return value of type RET_TYPE is held. */ static rtx rx_function_value (const_tree ret_type, const_tree fn_decl_or_type ATTRIBUTE_UNUSED, bool outgoing ATTRIBUTE_UNUSED) { enum machine_mode mode = TYPE_MODE (ret_type); /* RX ABI specifies that small integer types are promoted to int when returned by a function. */ if (GET_MODE_SIZE (mode) > 0 && GET_MODE_SIZE (mode) < 4 && ! COMPLEX_MODE_P (mode) ) return gen_rtx_REG (SImode, FUNC_RETURN_REGNUM); return gen_rtx_REG (mode, FUNC_RETURN_REGNUM); } /* TARGET_PROMOTE_FUNCTION_MODE must behave in the same way with regard to function returns as does TARGET_FUNCTION_VALUE. */ static enum machine_mode rx_promote_function_mode (const_tree type ATTRIBUTE_UNUSED, enum machine_mode mode, int * punsignedp ATTRIBUTE_UNUSED, const_tree funtype ATTRIBUTE_UNUSED, int for_return) { if (for_return != 1 || GET_MODE_SIZE (mode) >= 4 || COMPLEX_MODE_P (mode) || GET_MODE_SIZE (mode) < 1) return mode; return SImode; } static bool rx_return_in_memory (const_tree type, const_tree fntype ATTRIBUTE_UNUSED) { HOST_WIDE_INT size; if (TYPE_MODE (type) != BLKmode && ! AGGREGATE_TYPE_P (type)) return false; size = int_size_in_bytes (type); /* Large structs and those whose size is not an exact multiple of 4 are returned in memory. */ return size < 1 || size > 16 || (size % UNITS_PER_WORD) != 0; } static rtx rx_struct_value_rtx (tree fndecl ATTRIBUTE_UNUSED, int incoming ATTRIBUTE_UNUSED) { return gen_rtx_REG (Pmode, STRUCT_VAL_REGNUM); } static bool rx_return_in_msb (const_tree valtype) { return TARGET_BIG_ENDIAN_DATA && (AGGREGATE_TYPE_P (valtype) || TREE_CODE (valtype) == COMPLEX_TYPE); } /* Returns true if the provided function has the specified attribute. */ static inline bool has_func_attr (const_tree decl, const char * func_attr) { if (decl == NULL_TREE) decl = current_function_decl; return lookup_attribute (func_attr, DECL_ATTRIBUTES (decl)) != NULL_TREE; } /* Returns true if the provided function has the "fast_interrupt" attribute. */ static inline bool is_fast_interrupt_func (const_tree decl) { return has_func_attr (decl, "fast_interrupt"); } /* Returns true if the provided function has the "interrupt" attribute. */ static inline bool is_interrupt_func (const_tree decl) { return has_func_attr (decl, "interrupt"); } /* Returns true if the provided function has the "naked" attribute. */ static inline bool is_naked_func (const_tree decl) { return has_func_attr (decl, "naked"); } static bool use_fixed_regs = false; static void rx_conditional_register_usage (void) { static bool using_fixed_regs = false; if (TARGET_PID) { rx_pid_base_regnum_val = GP_BASE_REGNUM - rx_num_interrupt_regs; fixed_regs[rx_pid_base_regnum_val] = call_used_regs [rx_pid_base_regnum_val] = 1; } if (rx_small_data_limit > 0) { if (TARGET_PID) rx_gp_base_regnum_val = rx_pid_base_regnum_val - 1; else rx_gp_base_regnum_val = GP_BASE_REGNUM - rx_num_interrupt_regs; fixed_regs[rx_gp_base_regnum_val] = call_used_regs [rx_gp_base_regnum_val] = 1; } if (use_fixed_regs != using_fixed_regs) { static char saved_fixed_regs[FIRST_PSEUDO_REGISTER]; static char saved_call_used_regs[FIRST_PSEUDO_REGISTER]; if (use_fixed_regs) { unsigned int r; memcpy (saved_fixed_regs, fixed_regs, sizeof fixed_regs); memcpy (saved_call_used_regs, call_used_regs, sizeof call_used_regs); /* This is for fast interrupt handlers. Any register in the range r10 to r13 (inclusive) that is currently marked as fixed is now a viable, call-used register. */ for (r = 10; r <= 13; r++) if (fixed_regs[r]) { fixed_regs[r] = 0; call_used_regs[r] = 1; } /* Mark r7 as fixed. This is just a hack to avoid altering the reg_alloc_order array so that the newly freed r10-r13 registers are the preferred registers. */ fixed_regs[7] = call_used_regs[7] = 1; } else { /* Restore the normal register masks. */ memcpy (fixed_regs, saved_fixed_regs, sizeof fixed_regs); memcpy (call_used_regs, saved_call_used_regs, sizeof call_used_regs); } using_fixed_regs = use_fixed_regs; } } /* Perform any actions necessary before starting to compile FNDECL. For the RX we use this to make sure that we have the correct set of register masks selected. If FNDECL is NULL then we are compiling top level things. */ static void rx_set_current_function (tree fndecl) { /* Remember the last target of rx_set_current_function. */ static tree rx_previous_fndecl; bool prev_was_fast_interrupt; bool current_is_fast_interrupt; /* Only change the context if the function changes. This hook is called several times in the course of compiling a function, and we don't want to slow things down too much or call target_reinit when it isn't safe. */ if (fndecl == rx_previous_fndecl) return; prev_was_fast_interrupt = rx_previous_fndecl ? is_fast_interrupt_func (rx_previous_fndecl) : false; current_is_fast_interrupt = fndecl ? is_fast_interrupt_func (fndecl) : false; if (prev_was_fast_interrupt != current_is_fast_interrupt) { use_fixed_regs = current_is_fast_interrupt; target_reinit (); } rx_previous_fndecl = fndecl; } /* Typical stack layout should looks like this after the function's prologue: | | -- ^ | | \ | | | arguments saved | Increasing | | on the stack | addresses PARENT arg pointer -> | | / -------------------------- ---- ------------------- CHILD |ret | return address -- | | \ | | call saved | | registers | | / -- | | \ | | local | | variables frame pointer -> | | / -- | | \ | | outgoing | Decreasing | | arguments | addresses current stack pointer -> | | / | -------------------------- ---- ------------------ V | | */ static unsigned int bit_count (unsigned int x) { const unsigned int m1 = 0x55555555; const unsigned int m2 = 0x33333333; const unsigned int m4 = 0x0f0f0f0f; x -= (x >> 1) & m1; x = (x & m2) + ((x >> 2) & m2); x = (x + (x >> 4)) & m4; x += x >> 8; return (x + (x >> 16)) & 0x3f; } #define MUST_SAVE_ACC_REGISTER \ (TARGET_SAVE_ACC_REGISTER \ && (is_interrupt_func (NULL_TREE) \ || is_fast_interrupt_func (NULL_TREE))) /* Returns either the lowest numbered and highest numbered registers that occupy the call-saved area of the stack frame, if the registers are stored as a contiguous block, or else a bitmask of the individual registers if they are stored piecemeal. Also computes the size of the frame and the size of the outgoing arguments block (in bytes). */ static void rx_get_stack_layout (unsigned int * lowest, unsigned int * highest, unsigned int * register_mask, unsigned int * frame_size, unsigned int * stack_size) { unsigned int reg; unsigned int low; unsigned int high; unsigned int fixed_reg = 0; unsigned int save_mask; unsigned int pushed_mask; unsigned int unneeded_pushes; if (is_naked_func (NULL_TREE)) { /* Naked functions do not create their own stack frame. Instead the programmer must do that for us. */ * lowest = 0; * highest = 0; * register_mask = 0; * frame_size = 0; * stack_size = 0; return; } for (save_mask = high = low = 0, reg = 1; reg < CC_REGNUM; reg++) { if ((df_regs_ever_live_p (reg) /* Always save all call clobbered registers inside non-leaf interrupt handlers, even if they are not live - they may be used in (non-interrupt aware) routines called from this one. */ || (call_used_regs[reg] && is_interrupt_func (NULL_TREE) && ! current_function_is_leaf)) && (! call_used_regs[reg] /* Even call clobbered registered must be pushed inside interrupt handlers. */ || is_interrupt_func (NULL_TREE) /* Likewise for fast interrupt handlers, except registers r10 - r13. These are normally call-saved, but may have been set to call-used by rx_conditional_register_usage. If so then they can be used in the fast interrupt handler without saving them on the stack. */ || (is_fast_interrupt_func (NULL_TREE) && ! IN_RANGE (reg, 10, 13)))) { if (low == 0) low = reg; high = reg; save_mask |= 1 << reg; } /* Remember if we see a fixed register after having found the low register. */ if (low != 0 && fixed_reg == 0 && fixed_regs [reg]) fixed_reg = reg; } /* If we have to save the accumulator register, make sure that at least two registers are pushed into the frame. */ if (MUST_SAVE_ACC_REGISTER && bit_count (save_mask) < 2) { save_mask |= (1 << 13) | (1 << 14); if (low == 0) low = 13; if (high == 0 || low == high) high = low + 1; } /* Decide if it would be faster fill in the call-saved area of the stack frame using multiple PUSH instructions instead of a single PUSHM instruction. SAVE_MASK is a bitmask of the registers that must be stored in the call-save area. PUSHED_MASK is a bitmask of the registers that would be pushed into the area if we used a PUSHM instruction. UNNEEDED_PUSHES is a bitmask of those registers in pushed_mask that are not in save_mask. We use a simple heuristic that says that it is better to use multiple PUSH instructions if the number of unnecessary pushes is greater than the number of necessary pushes. We also use multiple PUSH instructions if there are any fixed registers between LOW and HIGH. The only way that this can happen is if the user has specified --fixed-<reg-name> on the command line and in such circumstances we do not want to touch the fixed registers at all. FIXME: Is it worth improving this heuristic ? */ pushed_mask = (-1 << low) & ~(-1 << (high + 1)); unneeded_pushes = (pushed_mask & (~ save_mask)) & pushed_mask; if ((fixed_reg && fixed_reg <= high) || (optimize_function_for_speed_p (cfun) && bit_count (save_mask) < bit_count (unneeded_pushes))) { /* Use multiple pushes. */ * lowest = 0; * highest = 0; * register_mask = save_mask; } else { /* Use one push multiple instruction. */ * lowest = low; * highest = high; * register_mask = 0; } * frame_size = rx_round_up (get_frame_size (), STACK_BOUNDARY / BITS_PER_UNIT); if (crtl->args.size > 0) * frame_size += rx_round_up (crtl->args.size, STACK_BOUNDARY / BITS_PER_UNIT); * stack_size = rx_round_up (crtl->outgoing_args_size, STACK_BOUNDARY / BITS_PER_UNIT); } /* Generate a PUSHM instruction that matches the given operands. */ void rx_emit_stack_pushm (rtx * operands) { HOST_WIDE_INT last_reg; rtx first_push; gcc_assert (CONST_INT_P (operands[0])); last_reg = (INTVAL (operands[0]) / UNITS_PER_WORD) - 1; gcc_assert (GET_CODE (operands[1]) == PARALLEL); first_push = XVECEXP (operands[1], 0, 1); gcc_assert (SET_P (first_push)); first_push = SET_SRC (first_push); gcc_assert (REG_P (first_push)); asm_fprintf (asm_out_file, "\tpushm\t%s-%s\n", reg_names [REGNO (first_push) - last_reg], reg_names [REGNO (first_push)]); } /* Generate a PARALLEL that will pass the rx_store_multiple_vector predicate. */ static rtx gen_rx_store_vector (unsigned int low, unsigned int high) { unsigned int i; unsigned int count = (high - low) + 2; rtx vector; vector = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (count)); XVECEXP (vector, 0, 0) = gen_rtx_SET (VOIDmode, stack_pointer_rtx, gen_rtx_MINUS (SImode, stack_pointer_rtx, GEN_INT ((count - 1) * UNITS_PER_WORD))); for (i = 0; i < count - 1; i++) XVECEXP (vector, 0, i + 1) = gen_rtx_SET (VOIDmode, gen_rtx_MEM (SImode, gen_rtx_MINUS (SImode, stack_pointer_rtx, GEN_INT ((i + 1) * UNITS_PER_WORD))), gen_rtx_REG (SImode, high - i)); return vector; } /* Mark INSN as being frame related. If it is a PARALLEL then mark each element as being frame related as well. */ static void mark_frame_related (rtx insn) { RTX_FRAME_RELATED_P (insn) = 1; insn = PATTERN (insn); if (GET_CODE (insn) == PARALLEL) { unsigned int i; for (i = 0; i < (unsigned) XVECLEN (insn, 0); i++) RTX_FRAME_RELATED_P (XVECEXP (insn, 0, i)) = 1; } } static bool ok_for_max_constant (HOST_WIDE_INT val) { if (rx_max_constant_size == 0 || rx_max_constant_size == 4) /* If there is no constraint on the size of constants used as operands, then any value is legitimate. */ return true; /* rx_max_constant_size specifies the maximum number of bytes that can be used to hold a signed value. */ return IN_RANGE (val, (-1 << (rx_max_constant_size * 8)), ( 1 << (rx_max_constant_size * 8))); } /* Generate an ADD of SRC plus VAL into DEST. Handles the case where VAL is too big for max_constant_value. Sets FRAME_RELATED_P on the insn if IS_FRAME_RELATED is true. */ static void gen_safe_add (rtx dest, rtx src, rtx val, bool is_frame_related) { rtx insn; if (val == NULL_RTX || INTVAL (val) == 0) { gcc_assert (dest != src); insn = emit_move_insn (dest, src); } else if (ok_for_max_constant (INTVAL (val))) insn = emit_insn (gen_addsi3 (dest, src, val)); else { /* Wrap VAL in an UNSPEC so that rx_is_legitimate_constant will not reject it. */ val = gen_rtx_CONST (SImode, gen_rtx_UNSPEC (SImode, gen_rtvec (1, val), UNSPEC_CONST)); insn = emit_insn (gen_addsi3 (dest, src, val)); if (is_frame_related) /* We have to provide our own frame related note here as the dwarf2out code cannot be expected to grok our unspec. */ add_reg_note (insn, REG_FRAME_RELATED_EXPR, gen_rtx_SET (SImode, dest, gen_rtx_PLUS (SImode, src, val))); return; } if (is_frame_related) RTX_FRAME_RELATED_P (insn) = 1; return; } void rx_expand_prologue (void) { unsigned int stack_size; unsigned int frame_size; unsigned int mask; unsigned int low; unsigned int high; unsigned int reg; rtx insn; /* Naked functions use their own, programmer provided prologues. */ if (is_naked_func (NULL_TREE)) return; rx_get_stack_layout (& low, & high, & mask, & frame_size, & stack_size); /* If we use any of the callee-saved registers, save them now. */ if (mask) { /* Push registers in reverse order. */ for (reg = CC_REGNUM; reg --;) if (mask & (1 << reg)) { insn = emit_insn (gen_stack_push (gen_rtx_REG (SImode, reg))); mark_frame_related (insn); } } else if (low) { if (high == low) insn = emit_insn (gen_stack_push (gen_rtx_REG (SImode, low))); else insn = emit_insn (gen_stack_pushm (GEN_INT (((high - low) + 1) * UNITS_PER_WORD), gen_rx_store_vector (low, high))); mark_frame_related (insn); } if (MUST_SAVE_ACC_REGISTER) { unsigned int acc_high, acc_low; /* Interrupt handlers have to preserve the accumulator register if so requested by the user. Use the first two pushed registers as intermediaries. */ if (mask) { acc_low = acc_high = 0; for (reg = 1; reg < CC_REGNUM; reg ++) if (mask & (1 << reg)) { if (acc_low == 0) acc_low = reg; else { acc_high = reg; break; } } /* We have assumed that there are at least two registers pushed... */ gcc_assert (acc_high != 0); /* Note - the bottom 16 bits of the accumulator are inaccessible. We just assume that they are zero. */ emit_insn (gen_mvfacmi (gen_rtx_REG (SImode, acc_low))); emit_insn (gen_mvfachi (gen_rtx_REG (SImode, acc_high))); emit_insn (gen_stack_push (gen_rtx_REG (SImode, acc_low))); emit_insn (gen_stack_push (gen_rtx_REG (SImode, acc_high))); } else { acc_low = low; acc_high = low + 1; /* We have assumed that there are at least two registers pushed... */ gcc_assert (acc_high <= high); emit_insn (gen_mvfacmi (gen_rtx_REG (SImode, acc_low))); emit_insn (gen_mvfachi (gen_rtx_REG (SImode, acc_high))); emit_insn (gen_stack_pushm (GEN_INT (2 * UNITS_PER_WORD), gen_rx_store_vector (acc_low, acc_high))); } } /* If needed, set up the frame pointer. */ if (frame_pointer_needed) gen_safe_add (frame_pointer_rtx, stack_pointer_rtx, GEN_INT (- (HOST_WIDE_INT) frame_size), true); /* Allocate space for the outgoing args. If the stack frame has not already been set up then handle this as well. */ if (stack_size) { if (frame_size) { if (frame_pointer_needed) gen_safe_add (stack_pointer_rtx, frame_pointer_rtx, GEN_INT (- (HOST_WIDE_INT) stack_size), true); else gen_safe_add (stack_pointer_rtx, stack_pointer_rtx, GEN_INT (- (HOST_WIDE_INT) (frame_size + stack_size)), true); } else gen_safe_add (stack_pointer_rtx, stack_pointer_rtx, GEN_INT (- (HOST_WIDE_INT) stack_size), true); } else if (frame_size) { if (! frame_pointer_needed) gen_safe_add (stack_pointer_rtx, stack_pointer_rtx, GEN_INT (- (HOST_WIDE_INT) frame_size), true); else gen_safe_add (stack_pointer_rtx, frame_pointer_rtx, NULL_RTX, true); } } static void rx_output_function_prologue (FILE * file, HOST_WIDE_INT frame_size ATTRIBUTE_UNUSED) { if (is_fast_interrupt_func (NULL_TREE)) asm_fprintf (file, "\t; Note: Fast Interrupt Handler\n"); if (is_interrupt_func (NULL_TREE)) asm_fprintf (file, "\t; Note: Interrupt Handler\n"); if (is_naked_func (NULL_TREE)) asm_fprintf (file, "\t; Note: Naked Function\n"); if (cfun->static_chain_decl != NULL) asm_fprintf (file, "\t; Note: Nested function declared " "inside another function.\n"); if (crtl->calls_eh_return) asm_fprintf (file, "\t; Note: Calls __builtin_eh_return.\n"); } /* Generate a POPM or RTSD instruction that matches the given operands. */ void rx_emit_stack_popm (rtx * operands, bool is_popm) { HOST_WIDE_INT stack_adjust; HOST_WIDE_INT last_reg; rtx first_push; gcc_assert (CONST_INT_P (operands[0])); stack_adjust = INTVAL (operands[0]); gcc_assert (GET_CODE (operands[1]) == PARALLEL); last_reg = XVECLEN (operands[1], 0) - (is_popm ? 2 : 3); first_push = XVECEXP (operands[1], 0, 1); gcc_assert (SET_P (first_push)); first_push = SET_DEST (first_push); gcc_assert (REG_P (first_push)); if (is_popm) asm_fprintf (asm_out_file, "\tpopm\t%s-%s\n", reg_names [REGNO (first_push)], reg_names [REGNO (first_push) + last_reg]); else asm_fprintf (asm_out_file, "\trtsd\t#%d, %s-%s\n", (int) stack_adjust, reg_names [REGNO (first_push)], reg_names [REGNO (first_push) + last_reg]); } /* Generate a PARALLEL which will satisfy the rx_rtsd_vector predicate. */ static rtx gen_rx_rtsd_vector (unsigned int adjust, unsigned int low, unsigned int high) { unsigned int i; unsigned int bias = 3; unsigned int count = (high - low) + bias; rtx vector; vector = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (count)); XVECEXP (vector, 0, 0) = gen_rtx_SET (VOIDmode, stack_pointer_rtx, plus_constant (stack_pointer_rtx, adjust)); for (i = 0; i < count - 2; i++) XVECEXP (vector, 0, i + 1) = gen_rtx_SET (VOIDmode, gen_rtx_REG (SImode, low + i), gen_rtx_MEM (SImode, i == 0 ? stack_pointer_rtx : plus_constant (stack_pointer_rtx, i * UNITS_PER_WORD))); XVECEXP (vector, 0, count - 1) = ret_rtx; return vector; } /* Generate a PARALLEL which will satisfy the rx_load_multiple_vector predicate. */ static rtx gen_rx_popm_vector (unsigned int low, unsigned int high) { unsigned int i; unsigned int count = (high - low) + 2; rtx vector; vector = gen_rtx_PARALLEL (VOIDmode, rtvec_alloc (count)); XVECEXP (vector, 0, 0) = gen_rtx_SET (VOIDmode, stack_pointer_rtx, plus_constant (stack_pointer_rtx, (count - 1) * UNITS_PER_WORD)); for (i = 0; i < count - 1; i++) XVECEXP (vector, 0, i + 1) = gen_rtx_SET (VOIDmode, gen_rtx_REG (SImode, low + i), gen_rtx_MEM (SImode, i == 0 ? stack_pointer_rtx : plus_constant (stack_pointer_rtx, i * UNITS_PER_WORD))); return vector; } /* Returns true if a simple return insn can be used. */ bool rx_can_use_simple_return (void) { unsigned int low; unsigned int high; unsigned int frame_size; unsigned int stack_size; unsigned int register_mask; if (is_naked_func (NULL_TREE) || is_fast_interrupt_func (NULL_TREE) || is_interrupt_func (NULL_TREE)) return false; rx_get_stack_layout (& low, & high, & register_mask, & frame_size, & stack_size); return (register_mask == 0 && (frame_size + stack_size) == 0 && low == 0); } void rx_expand_epilogue (bool is_sibcall) { unsigned int low; unsigned int high; unsigned int frame_size; unsigned int stack_size; unsigned int register_mask; unsigned int regs_size; unsigned int reg; unsigned HOST_WIDE_INT total_size; /* FIXME: We do not support indirect sibcalls at the moment becaause we cannot guarantee that the register holding the function address is a call-used register. If it is a call-saved register then the stack pop instructions generated in the epilogue will corrupt the address before it is used. Creating a new call-used-only register class works but then the reload pass gets stuck because it cannot always find a call-used register for spilling sibcalls. The other possible solution is for this pass to scan forward for the sibcall instruction (if it has been generated) and work out if it is an indirect sibcall using a call-saved register. If it is then the address can copied into a call-used register in this epilogue code and the sibcall instruction modified to use that register. */ if (is_naked_func (NULL_TREE)) { gcc_assert (! is_sibcall); /* Naked functions use their own, programmer provided epilogues. But, in order to keep gcc happy we have to generate some kind of epilogue RTL. */ emit_jump_insn (gen_naked_return ()); return; } rx_get_stack_layout (& low, & high, & register_mask, & frame_size, & stack_size); total_size = frame_size + stack_size; regs_size = ((high - low) + 1) * UNITS_PER_WORD; /* See if we are unable to use the special stack frame deconstruct and return instructions. In most cases we can use them, but the exceptions are: - Sibling calling functions deconstruct the frame but do not return to their caller. Instead they branch to their sibling and allow their return instruction to return to this function's parent. - Fast and normal interrupt handling functions have to use special return instructions. - Functions where we have pushed a fragmented set of registers into the call-save area must have the same set of registers popped. */ if (is_sibcall || is_fast_interrupt_func (NULL_TREE) || is_interrupt_func (NULL_TREE) || register_mask) { /* Cannot use the special instructions - deconstruct by hand. */ if (total_size) gen_safe_add (stack_pointer_rtx, stack_pointer_rtx, GEN_INT (total_size), false); if (MUST_SAVE_ACC_REGISTER) { unsigned int acc_low, acc_high; /* Reverse the saving of the accumulator register onto the stack. Note we must adjust the saved "low" accumulator value as it is really the middle 32-bits of the accumulator. */ if (register_mask) { acc_low = acc_high = 0; for (reg = 1; reg < CC_REGNUM; reg ++) if (register_mask & (1 << reg)) { if (acc_low == 0) acc_low = reg; else { acc_high = reg; break; } } emit_insn (gen_stack_pop (gen_rtx_REG (SImode, acc_high))); emit_insn (gen_stack_pop (gen_rtx_REG (SImode, acc_low))); } else { acc_low = low; acc_high = low + 1; emit_insn (gen_stack_popm (GEN_INT (2 * UNITS_PER_WORD), gen_rx_popm_vector (acc_low, acc_high))); } emit_insn (gen_ashlsi3 (gen_rtx_REG (SImode, acc_low), gen_rtx_REG (SImode, acc_low), GEN_INT (16))); emit_insn (gen_mvtaclo (gen_rtx_REG (SImode, acc_low))); emit_insn (gen_mvtachi (gen_rtx_REG (SImode, acc_high))); } if (register_mask) { for (reg = 0; reg < CC_REGNUM; reg ++) if (register_mask & (1 << reg)) emit_insn (gen_stack_pop (gen_rtx_REG (SImode, reg))); } else if (low) { if (high == low) emit_insn (gen_stack_pop (gen_rtx_REG (SImode, low))); else emit_insn (gen_stack_popm (GEN_INT (regs_size), gen_rx_popm_vector (low, high))); } if (is_fast_interrupt_func (NULL_TREE)) { gcc_assert (! is_sibcall); emit_jump_insn (gen_fast_interrupt_return ()); } else if (is_interrupt_func (NULL_TREE)) { gcc_assert (! is_sibcall); emit_jump_insn (gen_exception_return ()); } else if (! is_sibcall) emit_jump_insn (gen_simple_return ()); return; } /* If we allocated space on the stack, free it now. */ if (total_size) { unsigned HOST_WIDE_INT rtsd_size; /* See if we can use the RTSD instruction. */ rtsd_size = total_size + regs_size; if (rtsd_size < 1024 && (rtsd_size % 4) == 0) { if (low) emit_jump_insn (gen_pop_and_return (GEN_INT (rtsd_size), gen_rx_rtsd_vector (rtsd_size, low, high))); else emit_jump_insn (gen_deallocate_and_return (GEN_INT (total_size))); return; } gen_safe_add (stack_pointer_rtx, stack_pointer_rtx, GEN_INT (total_size), false); } if (low) emit_jump_insn (gen_pop_and_return (GEN_INT (regs_size), gen_rx_rtsd_vector (regs_size, low, high))); else emit_jump_insn (gen_simple_return ()); } /* Compute the offset (in words) between FROM (arg pointer or frame pointer) and TO (frame pointer or stack pointer). See ASCII art comment at the start of rx_expand_prologue for more information. */ int rx_initial_elimination_offset (int from, int to) { unsigned int low; unsigned int high; unsigned int frame_size; unsigned int stack_size; unsigned int mask; rx_get_stack_layout (& low, & high, & mask, & frame_size, & stack_size); if (from == ARG_POINTER_REGNUM) { /* Extend the computed size of the stack frame to include the registers pushed in the prologue. */ if (low) frame_size += ((high - low) + 1) * UNITS_PER_WORD; else frame_size += bit_count (mask) * UNITS_PER_WORD; /* Remember to include the return address. */ frame_size += 1 * UNITS_PER_WORD; if (to == FRAME_POINTER_REGNUM) return frame_size; gcc_assert (to == STACK_POINTER_REGNUM); return frame_size + stack_size; } gcc_assert (from == FRAME_POINTER_REGNUM && to == STACK_POINTER_REGNUM); return stack_size; } /* Decide if a variable should go into one of the small data sections. */ static bool rx_in_small_data (const_tree decl) { int size; const_tree section; if (rx_small_data_limit == 0) return false; if (TREE_CODE (decl) != VAR_DECL) return false; /* We do not put read-only variables into a small data area because they would be placed with the other read-only sections, far away from the read-write data sections, and we only have one small data area pointer. Similarly commons are placed in the .bss section which might be far away (and out of alignment with respect to) the .data section. */ if (TREE_READONLY (decl) || DECL_COMMON (decl)) return false; section = DECL_SECTION_NAME (decl); if (section) { const char * const name = TREE_STRING_POINTER (section); return (strcmp (name, "D_2") == 0) || (strcmp (name, "B_2") == 0); } size = int_size_in_bytes (TREE_TYPE (decl)); return (size > 0) && (size <= rx_small_data_limit); } /* Return a section for X. The only special thing we do here is to honor small data. */ static section * rx_select_rtx_section (enum machine_mode mode, rtx x, unsigned HOST_WIDE_INT align) { if (rx_small_data_limit > 0 && GET_MODE_SIZE (mode) <= rx_small_data_limit && align <= (unsigned HOST_WIDE_INT) rx_small_data_limit * BITS_PER_UNIT) return sdata_section; return default_elf_select_rtx_section (mode, x, align); } static section * rx_select_section (tree decl, int reloc, unsigned HOST_WIDE_INT align) { if (rx_small_data_limit > 0) { switch (categorize_decl_for_section (decl, reloc)) { case SECCAT_SDATA: return sdata_section; case SECCAT_SBSS: return sbss_section; case SECCAT_SRODATA: /* Fall through. We do not put small, read only data into the C_2 section because we are not using the C_2 section. We do not use the C_2 section because it is located with the other read-only data sections, far away from the read-write data sections and we only have one small data pointer (r13). */ default: break; } } /* If we are supporting the Renesas assembler we cannot use mergeable sections. */ if (TARGET_AS100_SYNTAX) switch (categorize_decl_for_section (decl, reloc)) { case SECCAT_RODATA_MERGE_CONST: case SECCAT_RODATA_MERGE_STR_INIT: case SECCAT_RODATA_MERGE_STR: return readonly_data_section; default: break; } return default_elf_select_section (decl, reloc, align); } enum rx_builtin { RX_BUILTIN_BRK, RX_BUILTIN_CLRPSW, RX_BUILTIN_INT, RX_BUILTIN_MACHI, RX_BUILTIN_MACLO, RX_BUILTIN_MULHI, RX_BUILTIN_MULLO, RX_BUILTIN_MVFACHI, RX_BUILTIN_MVFACMI, RX_BUILTIN_MVFC, RX_BUILTIN_MVTACHI, RX_BUILTIN_MVTACLO, RX_BUILTIN_MVTC, RX_BUILTIN_MVTIPL, RX_BUILTIN_RACW, RX_BUILTIN_REVW, RX_BUILTIN_RMPA, RX_BUILTIN_ROUND, RX_BUILTIN_SETPSW, RX_BUILTIN_WAIT, RX_BUILTIN_max }; static GTY(()) tree rx_builtins[(int) RX_BUILTIN_max]; static void rx_init_builtins (void) { #define ADD_RX_BUILTIN1(UC_NAME, LC_NAME, RET_TYPE, ARG_TYPE) \ rx_builtins[RX_BUILTIN_##UC_NAME] = \ add_builtin_function ("__builtin_rx_" LC_NAME, \ build_function_type_list (RET_TYPE##_type_node, \ ARG_TYPE##_type_node, \ NULL_TREE), \ RX_BUILTIN_##UC_NAME, \ BUILT_IN_MD, NULL, NULL_TREE) #define ADD_RX_BUILTIN2(UC_NAME, LC_NAME, RET_TYPE, ARG_TYPE1, ARG_TYPE2) \ rx_builtins[RX_BUILTIN_##UC_NAME] = \ add_builtin_function ("__builtin_rx_" LC_NAME, \ build_function_type_list (RET_TYPE##_type_node, \ ARG_TYPE1##_type_node,\ ARG_TYPE2##_type_node,\ NULL_TREE), \ RX_BUILTIN_##UC_NAME, \ BUILT_IN_MD, NULL, NULL_TREE) #define ADD_RX_BUILTIN3(UC_NAME,LC_NAME,RET_TYPE,ARG_TYPE1,ARG_TYPE2,ARG_TYPE3) \ rx_builtins[RX_BUILTIN_##UC_NAME] = \ add_builtin_function ("__builtin_rx_" LC_NAME, \ build_function_type_list (RET_TYPE##_type_node, \ ARG_TYPE1##_type_node,\ ARG_TYPE2##_type_node,\ ARG_TYPE3##_type_node,\ NULL_TREE), \ RX_BUILTIN_##UC_NAME, \ BUILT_IN_MD, NULL, NULL_TREE) ADD_RX_BUILTIN1 (BRK, "brk", void, void); ADD_RX_BUILTIN1 (CLRPSW, "clrpsw", void, integer); ADD_RX_BUILTIN1 (SETPSW, "setpsw", void, integer); ADD_RX_BUILTIN1 (INT, "int", void, integer); ADD_RX_BUILTIN2 (MACHI, "machi", void, intSI, intSI); ADD_RX_BUILTIN2 (MACLO, "maclo", void, intSI, intSI); ADD_RX_BUILTIN2 (MULHI, "mulhi", void, intSI, intSI); ADD_RX_BUILTIN2 (MULLO, "mullo", void, intSI, intSI); ADD_RX_BUILTIN1 (MVFACHI, "mvfachi", intSI, void); ADD_RX_BUILTIN1 (MVFACMI, "mvfacmi", intSI, void); ADD_RX_BUILTIN1 (MVTACHI, "mvtachi", void, intSI); ADD_RX_BUILTIN1 (MVTACLO, "mvtaclo", void, intSI); ADD_RX_BUILTIN1 (RMPA, "rmpa", void, void); ADD_RX_BUILTIN1 (MVFC, "mvfc", intSI, integer); ADD_RX_BUILTIN2 (MVTC, "mvtc", void, integer, integer); ADD_RX_BUILTIN1 (MVTIPL, "mvtipl", void, integer); ADD_RX_BUILTIN1 (RACW, "racw", void, integer); ADD_RX_BUILTIN1 (ROUND, "round", intSI, float); ADD_RX_BUILTIN1 (REVW, "revw", intSI, intSI); ADD_RX_BUILTIN1 (WAIT, "wait", void, void); } /* Return the RX builtin for CODE. */ static tree rx_builtin_decl (unsigned code, bool initialize_p ATTRIBUTE_UNUSED) { if (code >= RX_BUILTIN_max) return error_mark_node; return rx_builtins[code]; } static rtx rx_expand_void_builtin_1_arg (rtx arg, rtx (* gen_func)(rtx), bool reg) { if (reg && ! REG_P (arg)) arg = force_reg (SImode, arg); emit_insn (gen_func (arg)); return NULL_RTX; } static rtx rx_expand_builtin_mvtc (tree exp) { rtx arg1 = expand_normal (CALL_EXPR_ARG (exp, 0)); rtx arg2 = expand_normal (CALL_EXPR_ARG (exp, 1)); if (! CONST_INT_P (arg1)) return NULL_RTX; if (! REG_P (arg2)) arg2 = force_reg (SImode, arg2); emit_insn (gen_mvtc (arg1, arg2)); return NULL_RTX; } static rtx rx_expand_builtin_mvfc (tree t_arg, rtx target) { rtx arg = expand_normal (t_arg); if (! CONST_INT_P (arg)) return NULL_RTX; if (target == NULL_RTX) return NULL_RTX; if (! REG_P (target)) target = force_reg (SImode, target); emit_insn (gen_mvfc (target, arg)); return target; } static rtx rx_expand_builtin_mvtipl (rtx arg) { /* The RX610 does not support the MVTIPL instruction. */ if (rx_cpu_type == RX610) return NULL_RTX; if (! CONST_INT_P (arg) || ! IN_RANGE (INTVAL (arg), 0, (1 << 4) - 1)) return NULL_RTX; emit_insn (gen_mvtipl (arg)); return NULL_RTX; } static rtx rx_expand_builtin_mac (tree exp, rtx (* gen_func)(rtx, rtx)) { rtx arg1 = expand_normal (CALL_EXPR_ARG (exp, 0)); rtx arg2 = expand_normal (CALL_EXPR_ARG (exp, 1)); if (! REG_P (arg1)) arg1 = force_reg (SImode, arg1); if (! REG_P (arg2)) arg2 = force_reg (SImode, arg2); emit_insn (gen_func (arg1, arg2)); return NULL_RTX; } static rtx rx_expand_int_builtin_1_arg (rtx arg, rtx target, rtx (* gen_func)(rtx, rtx), bool mem_ok) { if (! REG_P (arg)) if (!mem_ok || ! MEM_P (arg)) arg = force_reg (SImode, arg); if (target == NULL_RTX || ! REG_P (target)) target = gen_reg_rtx (SImode); emit_insn (gen_func (target, arg)); return target; } static rtx rx_expand_int_builtin_0_arg (rtx target, rtx (* gen_func)(rtx)) { if (target == NULL_RTX || ! REG_P (target)) target = gen_reg_rtx (SImode); emit_insn (gen_func (target)); return target; } static rtx rx_expand_builtin_round (rtx arg, rtx target) { if ((! REG_P (arg) && ! MEM_P (arg)) || GET_MODE (arg) != SFmode) arg = force_reg (SFmode, arg); if (target == NULL_RTX || ! REG_P (target)) target = gen_reg_rtx (SImode); emit_insn (gen_lrintsf2 (target, arg)); return target; } static int valid_psw_flag (rtx op, const char *which) { static int mvtc_inform_done = 0; if (GET_CODE (op) == CONST_INT) switch (INTVAL (op)) { case 0: case 'c': case 'C': case 1: case 'z': case 'Z': case 2: case 's': case 'S': case 3: case 'o': case 'O': case 8: case 'i': case 'I': case 9: case 'u': case 'U': return 1; } error ("__builtin_rx_%s takes 'C', 'Z', 'S', 'O', 'I', or 'U'", which); if (!mvtc_inform_done) error ("use __builtin_rx_mvtc (0, ... ) to write arbitrary values to PSW"); mvtc_inform_done = 1; return 0; } static rtx rx_expand_builtin (tree exp, rtx target, rtx subtarget ATTRIBUTE_UNUSED, enum machine_mode mode ATTRIBUTE_UNUSED, int ignore ATTRIBUTE_UNUSED) { tree fndecl = TREE_OPERAND (CALL_EXPR_FN (exp), 0); tree arg = call_expr_nargs (exp) >= 1 ? CALL_EXPR_ARG (exp, 0) : NULL_TREE; rtx op = arg ? expand_normal (arg) : NULL_RTX; unsigned int fcode = DECL_FUNCTION_CODE (fndecl); switch (fcode) { case RX_BUILTIN_BRK: emit_insn (gen_brk ()); return NULL_RTX; case RX_BUILTIN_CLRPSW: if (!valid_psw_flag (op, "clrpsw")) return NULL_RTX; return rx_expand_void_builtin_1_arg (op, gen_clrpsw, false); case RX_BUILTIN_SETPSW: if (!valid_psw_flag (op, "setpsw")) return NULL_RTX; return rx_expand_void_builtin_1_arg (op, gen_setpsw, false); case RX_BUILTIN_INT: return rx_expand_void_builtin_1_arg (op, gen_int, false); case RX_BUILTIN_MACHI: return rx_expand_builtin_mac (exp, gen_machi); case RX_BUILTIN_MACLO: return rx_expand_builtin_mac (exp, gen_maclo); case RX_BUILTIN_MULHI: return rx_expand_builtin_mac (exp, gen_mulhi); case RX_BUILTIN_MULLO: return rx_expand_builtin_mac (exp, gen_mullo); case RX_BUILTIN_MVFACHI: return rx_expand_int_builtin_0_arg (target, gen_mvfachi); case RX_BUILTIN_MVFACMI: return rx_expand_int_builtin_0_arg (target, gen_mvfacmi); case RX_BUILTIN_MVTACHI: return rx_expand_void_builtin_1_arg (op, gen_mvtachi, true); case RX_BUILTIN_MVTACLO: return rx_expand_void_builtin_1_arg (op, gen_mvtaclo, true); case RX_BUILTIN_RMPA: emit_insn (gen_rmpa ()); return NULL_RTX; case RX_BUILTIN_MVFC: return rx_expand_builtin_mvfc (arg, target); case RX_BUILTIN_MVTC: return rx_expand_builtin_mvtc (exp); case RX_BUILTIN_MVTIPL: return rx_expand_builtin_mvtipl (op); case RX_BUILTIN_RACW: return rx_expand_void_builtin_1_arg (op, gen_racw, false); case RX_BUILTIN_ROUND: return rx_expand_builtin_round (op, target); case RX_BUILTIN_REVW: return rx_expand_int_builtin_1_arg (op, target, gen_revw, false); case RX_BUILTIN_WAIT: emit_insn (gen_wait ()); return NULL_RTX; default: internal_error ("bad builtin code"); break; } return NULL_RTX; } /* Place an element into a constructor or destructor section. Like default_ctor_section_asm_out_constructor in varasm.c except that it uses .init_array (or .fini_array) and it handles constructor priorities. */ static void rx_elf_asm_cdtor (rtx symbol, int priority, bool is_ctor) { section * s; if (priority != DEFAULT_INIT_PRIORITY) { char buf[18]; sprintf (buf, "%s.%.5u", is_ctor ? ".init_array" : ".fini_array", priority); s = get_section (buf, SECTION_WRITE, NULL_TREE); } else if (is_ctor) s = ctors_section; else s = dtors_section; switch_to_section (s); assemble_align (POINTER_SIZE); assemble_integer (symbol, POINTER_SIZE / BITS_PER_UNIT, POINTER_SIZE, 1); } static void rx_elf_asm_constructor (rtx symbol, int priority) { rx_elf_asm_cdtor (symbol, priority, /* is_ctor= */true); } static void rx_elf_asm_destructor (rtx symbol, int priority) { rx_elf_asm_cdtor (symbol, priority, /* is_ctor= */false); } /* Check "fast_interrupt", "interrupt" and "naked" attributes. */ static tree rx_handle_func_attribute (tree * node, tree name, tree args, int flags ATTRIBUTE_UNUSED, bool * no_add_attrs) { gcc_assert (DECL_P (* node)); gcc_assert (args == NULL_TREE); if (TREE_CODE (* node) != FUNCTION_DECL) { warning (OPT_Wattributes, "%qE attribute only applies to functions", name); * no_add_attrs = true; } /* FIXME: We ought to check for conflicting attributes. */ /* FIXME: We ought to check that the interrupt and exception handler attributes have been applied to void functions. */ return NULL_TREE; } /* Table of RX specific attributes. */ const struct attribute_spec rx_attribute_table[] = { /* Name, min_len, max_len, decl_req, type_req, fn_type_req, handler, affects_type_identity. */ { "fast_interrupt", 0, 0, true, false, false, rx_handle_func_attribute, false }, { "interrupt", 0, 0, true, false, false, rx_handle_func_attribute, false }, { "naked", 0, 0, true, false, false, rx_handle_func_attribute, false }, { NULL, 0, 0, false, false, false, NULL, false } }; /* Implement TARGET_OVERRIDE_OPTIONS_AFTER_CHANGE. */ static void rx_override_options_after_change (void) { static bool first_time = TRUE; if (first_time) { /* If this is the first time through and the user has not disabled the use of RX FPU hardware then enable -ffinite-math-only, since the FPU instructions do not support NaNs and infinities. */ if (TARGET_USE_FPU) flag_finite_math_only = 1; first_time = FALSE; } else { /* Alert the user if they are changing the optimization options to use IEEE compliant floating point arithmetic with RX FPU insns. */ if (TARGET_USE_FPU && !flag_finite_math_only) warning (0, "RX FPU instructions do not support NaNs and infinities"); } } static void rx_option_override (void) { unsigned int i; cl_deferred_option *opt; VEC(cl_deferred_option,heap) *vec = (VEC(cl_deferred_option,heap) *) rx_deferred_options; FOR_EACH_VEC_ELT (cl_deferred_option, vec, i, opt) { switch (opt->opt_index) { case OPT_mint_register_: switch (opt->value) { case 4: fixed_regs[10] = call_used_regs [10] = 1; /* Fall through. */ case 3: fixed_regs[11] = call_used_regs [11] = 1; /* Fall through. */ case 2: fixed_regs[12] = call_used_regs [12] = 1; /* Fall through. */ case 1: fixed_regs[13] = call_used_regs [13] = 1; /* Fall through. */ case 0: rx_num_interrupt_regs = opt->value; break; default: rx_num_interrupt_regs = 0; /* Error message already given because rx_handle_option returned false. */ break; } break; default: gcc_unreachable (); } } /* This target defaults to strict volatile bitfields. */ if (flag_strict_volatile_bitfields < 0 && abi_version_at_least(2)) flag_strict_volatile_bitfields = 1; rx_override_options_after_change (); if (align_jumps == 0 && ! optimize_size) align_jumps = 3; if (align_loops == 0 && ! optimize_size) align_loops = 3; if (align_labels == 0 && ! optimize_size) align_labels = 3; } static bool rx_allocate_stack_slots_for_args (void) { /* Naked functions should not allocate stack slots for arguments. */ return ! is_naked_func (NULL_TREE); } static bool rx_func_attr_inlinable (const_tree decl) { return ! is_fast_interrupt_func (decl) && ! is_interrupt_func (decl) && ! is_naked_func (decl); } /* Return nonzero if it is ok to make a tail-call to DECL, a function_decl or NULL if this is an indirect call, using EXP */ static bool rx_function_ok_for_sibcall (tree decl, tree exp ATTRIBUTE_UNUSED) { /* Do not allow indirect tailcalls. The sibcall patterns do not support them. */ if (decl == NULL) return false; /* Never tailcall from inside interrupt handlers or naked functions. */ if (is_fast_interrupt_func (NULL_TREE) || is_interrupt_func (NULL_TREE) || is_naked_func (NULL_TREE)) return false; return true; } static void rx_file_start (void) { if (! TARGET_AS100_SYNTAX) default_file_start (); } static bool rx_is_ms_bitfield_layout (const_tree record_type ATTRIBUTE_UNUSED) { /* The packed attribute overrides the MS behaviour. */ return ! TYPE_PACKED (record_type); } /* Returns true if X a legitimate constant for an immediate operand on the RX. X is already known to satisfy CONSTANT_P. */ bool rx_is_legitimate_constant (enum machine_mode mode ATTRIBUTE_UNUSED, rtx x) { switch (GET_CODE (x)) { case CONST: x = XEXP (x, 0); if (GET_CODE (x) == PLUS) { if (! CONST_INT_P (XEXP (x, 1))) return false; /* GCC would not pass us CONST_INT + CONST_INT so we know that we have {SYMBOL|LABEL} + CONST_INT. */ x = XEXP (x, 0); gcc_assert (! CONST_INT_P (x)); } switch (GET_CODE (x)) { case LABEL_REF: case SYMBOL_REF: return true; case UNSPEC: return XINT (x, 1) == UNSPEC_CONST || XINT (x, 1) == UNSPEC_PID_ADDR; default: /* FIXME: Can this ever happen ? */ gcc_unreachable (); } break; case LABEL_REF: case SYMBOL_REF: return true; case CONST_DOUBLE: return (rx_max_constant_size == 0 || rx_max_constant_size == 4); case CONST_VECTOR: return false; default: gcc_assert (CONST_INT_P (x)); break; } return ok_for_max_constant (INTVAL (x)); } static int rx_address_cost (rtx addr, bool speed) { rtx a, b; if (GET_CODE (addr) != PLUS) return COSTS_N_INSNS (1); a = XEXP (addr, 0); b = XEXP (addr, 1); if (REG_P (a) && REG_P (b)) /* Try to discourage REG+REG addressing as it keeps two registers live. */ return COSTS_N_INSNS (4); if (speed) /* [REG+OFF] is just as fast as [REG]. */ return COSTS_N_INSNS (1); if (CONST_INT_P (b) && ((INTVAL (b) > 128) || INTVAL (b) < -127)) /* Try to discourage REG + <large OFF> when optimizing for size. */ return COSTS_N_INSNS (2); return COSTS_N_INSNS (1); } static bool rx_can_eliminate (const int from ATTRIBUTE_UNUSED, const int to) { /* We can always eliminate to the frame pointer. We can eliminate to the stack pointer unless a frame pointer is needed. */ return to == FRAME_POINTER_REGNUM || ( to == STACK_POINTER_REGNUM && ! frame_pointer_needed); } static void rx_trampoline_template (FILE * file) { /* Output assembler code for a block containing the constant part of a trampoline, leaving space for the variable parts. On the RX, (where r8 is the static chain regnum) the trampoline looks like: mov #<static chain value>, r8 mov #<function's address>, r9 jmp r9 In big-endian-data-mode however instructions are read into the CPU 4 bytes at a time. These bytes are then swapped around before being passed to the decoder. So...we must partition our trampoline into 4 byte packets and swap these packets around so that the instruction reader will reverse the process. But, in order to avoid splitting the 32-bit constants across these packet boundaries, (making inserting them into the constructed trampoline very difficult) we have to pad the instruction sequence with NOP insns. ie: nop nop mov.l #<...>, r8 nop nop mov.l #<...>, r9 jmp r9 nop nop */ if (! TARGET_BIG_ENDIAN_DATA) { asm_fprintf (file, "\tmov.L\t#0deadbeefH, r%d\n", STATIC_CHAIN_REGNUM); asm_fprintf (file, "\tmov.L\t#0deadbeefH, r%d\n", TRAMPOLINE_TEMP_REGNUM); asm_fprintf (file, "\tjmp\tr%d\n", TRAMPOLINE_TEMP_REGNUM); } else { char r8 = '0' + STATIC_CHAIN_REGNUM; char r9 = '0' + TRAMPOLINE_TEMP_REGNUM; if (TARGET_AS100_SYNTAX) { asm_fprintf (file, "\t.BYTE 0%c2H, 0fbH, 003H, 003H\n", r8); asm_fprintf (file, "\t.BYTE 0deH, 0adH, 0beH, 0efH\n"); asm_fprintf (file, "\t.BYTE 0%c2H, 0fbH, 003H, 003H\n", r9); asm_fprintf (file, "\t.BYTE 0deH, 0adH, 0beH, 0efH\n"); asm_fprintf (file, "\t.BYTE 003H, 003H, 00%cH, 07fH\n", r9); } else { asm_fprintf (file, "\t.byte 0x%c2, 0xfb, 0x03, 0x03\n", r8); asm_fprintf (file, "\t.byte 0xde, 0xad, 0xbe, 0xef\n"); asm_fprintf (file, "\t.byte 0x%c2, 0xfb, 0x03, 0x03\n", r9); asm_fprintf (file, "\t.byte 0xde, 0xad, 0xbe, 0xef\n"); asm_fprintf (file, "\t.byte 0x03, 0x03, 0x0%c, 0x7f\n", r9); } } } static void rx_trampoline_init (rtx tramp, tree fndecl, rtx chain) { rtx fnaddr = XEXP (DECL_RTL (fndecl), 0); emit_block_move (tramp, assemble_trampoline_template (), GEN_INT (TRAMPOLINE_SIZE), BLOCK_OP_NORMAL); if (TARGET_BIG_ENDIAN_DATA) { emit_move_insn (adjust_address (tramp, SImode, 4), chain); emit_move_insn (adjust_address (tramp, SImode, 12), fnaddr); } else { emit_move_insn (adjust_address (tramp, SImode, 2), chain); emit_move_insn (adjust_address (tramp, SImode, 6 + 2), fnaddr); } } static int rx_memory_move_cost (enum machine_mode mode ATTRIBUTE_UNUSED, reg_class_t regclass ATTRIBUTE_UNUSED, bool in) { return (in ? 2 : 0) + REGISTER_MOVE_COST (mode, regclass, regclass); } /* Convert a CC_MODE to the set of flags that it represents. */ static unsigned int flags_from_mode (enum machine_mode mode) { switch (mode) { case CC_ZSmode: return CC_FLAG_S | CC_FLAG_Z; case CC_ZSOmode: return CC_FLAG_S | CC_FLAG_Z | CC_FLAG_O; case CC_ZSCmode: return CC_FLAG_S | CC_FLAG_Z | CC_FLAG_C; case CCmode: return CC_FLAG_S | CC_FLAG_Z | CC_FLAG_O | CC_FLAG_C; case CC_Fmode: return CC_FLAG_FP; default: gcc_unreachable (); } } /* Convert a set of flags to a CC_MODE that can implement it. */ static enum machine_mode mode_from_flags (unsigned int f) { if (f & CC_FLAG_FP) return CC_Fmode; if (f & CC_FLAG_O) { if (f & CC_FLAG_C) return CCmode; else return CC_ZSOmode; } else if (f & CC_FLAG_C) return CC_ZSCmode; else return CC_ZSmode; } /* Convert an RTX_CODE to the set of flags needed to implement it. This assumes an integer comparison. */ static unsigned int flags_from_code (enum rtx_code code) { switch (code) { case LT: case GE: return CC_FLAG_S; case GT: case LE: return CC_FLAG_S | CC_FLAG_O | CC_FLAG_Z; case GEU: case LTU: return CC_FLAG_C; case GTU: case LEU: return CC_FLAG_C | CC_FLAG_Z; case EQ: case NE: return CC_FLAG_Z; default: gcc_unreachable (); } } /* Return a CC_MODE of which both M1 and M2 are subsets. */ static enum machine_mode rx_cc_modes_compatible (enum machine_mode m1, enum machine_mode m2) { unsigned f; /* Early out for identical modes. */ if (m1 == m2) return m1; /* There's no valid combination for FP vs non-FP. */ f = flags_from_mode (m1) | flags_from_mode (m2); if (f & CC_FLAG_FP) return VOIDmode; /* Otherwise, see what mode can implement all the flags. */ return mode_from_flags (f); } /* Return the minimal CC mode needed to implement (CMP_CODE X Y). */ enum machine_mode rx_select_cc_mode (enum rtx_code cmp_code, rtx x, rtx y) { if (GET_MODE_CLASS (GET_MODE (x)) == MODE_FLOAT) return CC_Fmode; if (y != const0_rtx) return CCmode; return mode_from_flags (flags_from_code (cmp_code)); } /* Split the conditional branch. Emit (COMPARE C1 C2) into CC_REG with CC_MODE, and use that in branches based on that compare. */ void rx_split_cbranch (enum machine_mode cc_mode, enum rtx_code cmp1, rtx c1, rtx c2, rtx label) { rtx flags, x; flags = gen_rtx_REG (cc_mode, CC_REG); x = gen_rtx_COMPARE (cc_mode, c1, c2); x = gen_rtx_SET (VOIDmode, flags, x); emit_insn (x); x = gen_rtx_fmt_ee (cmp1, VOIDmode, flags, const0_rtx); x = gen_rtx_IF_THEN_ELSE (VOIDmode, x, label, pc_rtx); x = gen_rtx_SET (VOIDmode, pc_rtx, x); emit_jump_insn (x); } /* A helper function for matching parallels that set the flags. */ bool rx_match_ccmode (rtx insn, enum machine_mode cc_mode) { rtx op1, flags; enum machine_mode flags_mode; gcc_checking_assert (XVECLEN (PATTERN (insn), 0) == 2); op1 = XVECEXP (PATTERN (insn), 0, 1); gcc_checking_assert (GET_CODE (SET_SRC (op1)) == COMPARE); flags = SET_DEST (op1); flags_mode = GET_MODE (flags); if (GET_MODE (SET_SRC (op1)) != flags_mode) return false; if (GET_MODE_CLASS (flags_mode) != MODE_CC) return false; /* Ensure that the mode of FLAGS is compatible with CC_MODE. */ if (flags_from_mode (flags_mode) & ~flags_from_mode (cc_mode)) return false; return true; } int rx_align_for_label (rtx lab, int uses_threshold) { /* This is a simple heuristic to guess when an alignment would not be useful because the delay due to the inserted NOPs would be greater than the delay due to the misaligned branch. If uses_threshold is zero then the alignment is always useful. */ if (LABEL_P (lab) && LABEL_NUSES (lab) < uses_threshold) return 0; return optimize_size ? 1 : 3; } static int rx_max_skip_for_label (rtx lab) { int opsize; rtx op; if (lab == NULL_RTX) return 0; op = lab; do { op = next_nonnote_nondebug_insn (op); } while (op && (LABEL_P (op) || (INSN_P (op) && GET_CODE (PATTERN (op)) == USE))); if (!op) return 0; opsize = get_attr_length (op); if (opsize >= 0 && opsize < 8) return opsize - 1; return 0; } /* Compute the real length of the extending load-and-op instructions. */ int rx_adjust_insn_length (rtx insn, int current_length) { rtx extend, mem, offset; bool zero; int factor; switch (INSN_CODE (insn)) { default: return current_length; case CODE_FOR_plussi3_zero_extendhi: case CODE_FOR_andsi3_zero_extendhi: case CODE_FOR_iorsi3_zero_extendhi: case CODE_FOR_xorsi3_zero_extendhi: case CODE_FOR_divsi3_zero_extendhi: case CODE_FOR_udivsi3_zero_extendhi: case CODE_FOR_minussi3_zero_extendhi: case CODE_FOR_smaxsi3_zero_extendhi: case CODE_FOR_sminsi3_zero_extendhi: case CODE_FOR_multsi3_zero_extendhi: case CODE_FOR_comparesi3_zero_extendhi: zero = true; factor = 2; break; case CODE_FOR_plussi3_sign_extendhi: case CODE_FOR_andsi3_sign_extendhi: case CODE_FOR_iorsi3_sign_extendhi: case CODE_FOR_xorsi3_sign_extendhi: case CODE_FOR_divsi3_sign_extendhi: case CODE_FOR_udivsi3_sign_extendhi: case CODE_FOR_minussi3_sign_extendhi: case CODE_FOR_smaxsi3_sign_extendhi: case CODE_FOR_sminsi3_sign_extendhi: case CODE_FOR_multsi3_sign_extendhi: case CODE_FOR_comparesi3_sign_extendhi: zero = false; factor = 2; break; case CODE_FOR_plussi3_zero_extendqi: case CODE_FOR_andsi3_zero_extendqi: case CODE_FOR_iorsi3_zero_extendqi: case CODE_FOR_xorsi3_zero_extendqi: case CODE_FOR_divsi3_zero_extendqi: case CODE_FOR_udivsi3_zero_extendqi: case CODE_FOR_minussi3_zero_extendqi: case CODE_FOR_smaxsi3_zero_extendqi: case CODE_FOR_sminsi3_zero_extendqi: case CODE_FOR_multsi3_zero_extendqi: case CODE_FOR_comparesi3_zero_extendqi: zero = true; factor = 1; break; case CODE_FOR_plussi3_sign_extendqi: case CODE_FOR_andsi3_sign_extendqi: case CODE_FOR_iorsi3_sign_extendqi: case CODE_FOR_xorsi3_sign_extendqi: case CODE_FOR_divsi3_sign_extendqi: case CODE_FOR_udivsi3_sign_extendqi: case CODE_FOR_minussi3_sign_extendqi: case CODE_FOR_smaxsi3_sign_extendqi: case CODE_FOR_sminsi3_sign_extendqi: case CODE_FOR_multsi3_sign_extendqi: case CODE_FOR_comparesi3_sign_extendqi: zero = false; factor = 1; break; } /* We are expecting: (SET (REG) (<OP> (REG) (<EXTEND> (MEM)))). */ extend = single_set (insn); gcc_assert (extend != NULL_RTX); extend = SET_SRC (extend); if (GET_CODE (XEXP (extend, 0)) == ZERO_EXTEND || GET_CODE (XEXP (extend, 0)) == SIGN_EXTEND) extend = XEXP (extend, 0); else extend = XEXP (extend, 1); gcc_assert ((zero && (GET_CODE (extend) == ZERO_EXTEND)) || (! zero && (GET_CODE (extend) == SIGN_EXTEND))); mem = XEXP (extend, 0); gcc_checking_assert (MEM_P (mem)); if (REG_P (XEXP (mem, 0))) return (zero && factor == 1) ? 2 : 3; /* We are expecting: (MEM (PLUS (REG) (CONST_INT))). */ gcc_checking_assert (GET_CODE (XEXP (mem, 0)) == PLUS); gcc_checking_assert (REG_P (XEXP (XEXP (mem, 0), 0))); offset = XEXP (XEXP (mem, 0), 1); gcc_checking_assert (GET_CODE (offset) == CONST_INT); if (IN_RANGE (INTVAL (offset), 0, 255 * factor)) return (zero && factor == 1) ? 3 : 4; return (zero && factor == 1) ? 4 : 5; } #undef TARGET_ASM_JUMP_ALIGN_MAX_SKIP #define TARGET_ASM_JUMP_ALIGN_MAX_SKIP rx_max_skip_for_label #undef TARGET_ASM_LOOP_ALIGN_MAX_SKIP #define TARGET_ASM_LOOP_ALIGN_MAX_SKIP rx_max_skip_for_label #undef TARGET_LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP #define TARGET_LABEL_ALIGN_AFTER_BARRIER_MAX_SKIP rx_max_skip_for_label #undef TARGET_ASM_LABEL_ALIGN_MAX_SKIP #define TARGET_ASM_LABEL_ALIGN_MAX_SKIP rx_max_skip_for_label #undef TARGET_FUNCTION_VALUE #define TARGET_FUNCTION_VALUE rx_function_value #undef TARGET_RETURN_IN_MSB #define TARGET_RETURN_IN_MSB rx_return_in_msb #undef TARGET_IN_SMALL_DATA_P #define TARGET_IN_SMALL_DATA_P rx_in_small_data #undef TARGET_RETURN_IN_MEMORY #define TARGET_RETURN_IN_MEMORY rx_return_in_memory #undef TARGET_HAVE_SRODATA_SECTION #define TARGET_HAVE_SRODATA_SECTION true #undef TARGET_ASM_SELECT_RTX_SECTION #define TARGET_ASM_SELECT_RTX_SECTION rx_select_rtx_section #undef TARGET_ASM_SELECT_SECTION #define TARGET_ASM_SELECT_SECTION rx_select_section #undef TARGET_INIT_BUILTINS #define TARGET_INIT_BUILTINS rx_init_builtins #undef TARGET_BUILTIN_DECL #define TARGET_BUILTIN_DECL rx_builtin_decl #undef TARGET_EXPAND_BUILTIN #define TARGET_EXPAND_BUILTIN rx_expand_builtin #undef TARGET_ASM_CONSTRUCTOR #define TARGET_ASM_CONSTRUCTOR rx_elf_asm_constructor #undef TARGET_ASM_DESTRUCTOR #define TARGET_ASM_DESTRUCTOR rx_elf_asm_destructor #undef TARGET_STRUCT_VALUE_RTX #define TARGET_STRUCT_VALUE_RTX rx_struct_value_rtx #undef TARGET_ATTRIBUTE_TABLE #define TARGET_ATTRIBUTE_TABLE rx_attribute_table #undef TARGET_ASM_FILE_START #define TARGET_ASM_FILE_START rx_file_start #undef TARGET_MS_BITFIELD_LAYOUT_P #define TARGET_MS_BITFIELD_LAYOUT_P rx_is_ms_bitfield_layout #undef TARGET_LEGITIMATE_ADDRESS_P #define TARGET_LEGITIMATE_ADDRESS_P rx_is_legitimate_address #undef TARGET_MODE_DEPENDENT_ADDRESS_P #define TARGET_MODE_DEPENDENT_ADDRESS_P rx_mode_dependent_address_p #undef TARGET_ALLOCATE_STACK_SLOTS_FOR_ARGS #define TARGET_ALLOCATE_STACK_SLOTS_FOR_ARGS rx_allocate_stack_slots_for_args #undef TARGET_ASM_FUNCTION_PROLOGUE #define TARGET_ASM_FUNCTION_PROLOGUE rx_output_function_prologue #undef TARGET_FUNCTION_ATTRIBUTE_INLINABLE_P #define TARGET_FUNCTION_ATTRIBUTE_INLINABLE_P rx_func_attr_inlinable #undef TARGET_FUNCTION_OK_FOR_SIBCALL #define TARGET_FUNCTION_OK_FOR_SIBCALL rx_function_ok_for_sibcall #undef TARGET_FUNCTION_ARG #define TARGET_FUNCTION_ARG rx_function_arg #undef TARGET_FUNCTION_ARG_ADVANCE #define TARGET_FUNCTION_ARG_ADVANCE rx_function_arg_advance #undef TARGET_FUNCTION_ARG_BOUNDARY #define TARGET_FUNCTION_ARG_BOUNDARY rx_function_arg_boundary #undef TARGET_SET_CURRENT_FUNCTION #define TARGET_SET_CURRENT_FUNCTION rx_set_current_function #undef TARGET_ASM_INTEGER #define TARGET_ASM_INTEGER rx_assemble_integer #undef TARGET_USE_BLOCKS_FOR_CONSTANT_P #define TARGET_USE_BLOCKS_FOR_CONSTANT_P hook_bool_mode_const_rtx_true #undef TARGET_MAX_ANCHOR_OFFSET #define TARGET_MAX_ANCHOR_OFFSET 32 #undef TARGET_ADDRESS_COST #define TARGET_ADDRESS_COST rx_address_cost #undef TARGET_CAN_ELIMINATE #define TARGET_CAN_ELIMINATE rx_can_eliminate #undef TARGET_CONDITIONAL_REGISTER_USAGE #define TARGET_CONDITIONAL_REGISTER_USAGE rx_conditional_register_usage #undef TARGET_ASM_TRAMPOLINE_TEMPLATE #define TARGET_ASM_TRAMPOLINE_TEMPLATE rx_trampoline_template #undef TARGET_TRAMPOLINE_INIT #define TARGET_TRAMPOLINE_INIT rx_trampoline_init #undef TARGET_PRINT_OPERAND #define TARGET_PRINT_OPERAND rx_print_operand #undef TARGET_PRINT_OPERAND_ADDRESS #define TARGET_PRINT_OPERAND_ADDRESS rx_print_operand_address #undef TARGET_CC_MODES_COMPATIBLE #define TARGET_CC_MODES_COMPATIBLE rx_cc_modes_compatible #undef TARGET_MEMORY_MOVE_COST #define TARGET_MEMORY_MOVE_COST rx_memory_move_cost #undef TARGET_OPTION_OVERRIDE #define TARGET_OPTION_OVERRIDE rx_option_override #undef TARGET_PROMOTE_FUNCTION_MODE #define TARGET_PROMOTE_FUNCTION_MODE rx_promote_function_mode #undef TARGET_OVERRIDE_OPTIONS_AFTER_CHANGE #define TARGET_OVERRIDE_OPTIONS_AFTER_CHANGE rx_override_options_after_change #undef TARGET_FLAGS_REGNUM #define TARGET_FLAGS_REGNUM CC_REG #undef TARGET_LEGITIMATE_CONSTANT_P #define TARGET_LEGITIMATE_CONSTANT_P rx_is_legitimate_constant #undef TARGET_LEGITIMIZE_ADDRESS #define TARGET_LEGITIMIZE_ADDRESS rx_legitimize_address struct gcc_target targetm = TARGET_INITIALIZER; #include "gt-rx.h"
Go to most recent revision | Compare with Previous | Blame | View Log