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[/] [openrisc/] [trunk/] [gnu-src/] [gcc-4.2.2/] [gcc/] [rtlhooks.c] - Rev 154
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/* Generic hooks for the RTL middle-end. Copyright (C) 2004, 2005, 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 "rtl.h" #include "rtlhooks-def.h" #include "expr.h" #include "recog.h" /* For speed, we will copy the RTX hooks struct member-by-member instead of doing indirect calls. For these reason, we initialize *two* struct rtl_hooks globals: rtl_hooks is the one that is used to actually call the hooks, while general_rtl_hooks is used to restore the hooks by passes that modify them. */ const struct rtl_hooks general_rtl_hooks = RTL_HOOKS_INITIALIZER; struct rtl_hooks rtl_hooks = RTL_HOOKS_INITIALIZER; rtx gen_lowpart_general (enum machine_mode mode, rtx x) { rtx result = gen_lowpart_common (mode, x); if (result) return result; /* If it's a REG, it must be a hard reg that's not valid in MODE. */ else if (REG_P (x) /* Or we could have a subreg of a floating point value. */ || (GET_CODE (x) == SUBREG && FLOAT_MODE_P (GET_MODE (SUBREG_REG (x))))) { result = gen_lowpart_common (mode, copy_to_reg (x)); gcc_assert (result != 0); return result; } else { int offset = 0; /* The only additional case we can do is MEM. */ gcc_assert (MEM_P (x)); /* The following exposes the use of "x" to CSE. */ if (GET_MODE_SIZE (GET_MODE (x)) <= UNITS_PER_WORD && SCALAR_INT_MODE_P (GET_MODE (x)) && TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode), GET_MODE_BITSIZE (GET_MODE (x))) && ! no_new_pseudos) return gen_lowpart_general (mode, force_reg (GET_MODE (x), x)); if (WORDS_BIG_ENDIAN) offset = (MAX (GET_MODE_SIZE (GET_MODE (x)), UNITS_PER_WORD) - MAX (GET_MODE_SIZE (mode), UNITS_PER_WORD)); if (BYTES_BIG_ENDIAN) /* Adjust the address so that the address-after-the-data is unchanged. */ offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (mode)) - MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (x)))); return adjust_address (x, mode, offset); } } /* Similar to gen_lowpart, but cannot emit any instruction via copy_to_reg or force_reg. Mainly used in simplify-rtx.c. */ rtx gen_lowpart_no_emit_general (enum machine_mode mode, rtx x) { rtx result = gen_lowpart_if_possible (mode, x); if (result) return result; else return x; } rtx reg_num_sign_bit_copies_general (rtx x ATTRIBUTE_UNUSED, enum machine_mode mode ATTRIBUTE_UNUSED, rtx known_x ATTRIBUTE_UNUSED, enum machine_mode known_mode ATTRIBUTE_UNUSED, unsigned int known_ret ATTRIBUTE_UNUSED, unsigned int *result ATTRIBUTE_UNUSED) { return NULL; } rtx reg_nonzero_bits_general (rtx x ATTRIBUTE_UNUSED, enum machine_mode mode ATTRIBUTE_UNUSED, rtx known_x ATTRIBUTE_UNUSED, enum machine_mode known_mode ATTRIBUTE_UNUSED, unsigned HOST_WIDE_INT known_ret ATTRIBUTE_UNUSED, unsigned HOST_WIDE_INT *nonzero ATTRIBUTE_UNUSED) { return NULL; } bool reg_truncated_to_mode_general (enum machine_mode mode ATTRIBUTE_UNUSED, rtx x ATTRIBUTE_UNUSED) { return false; } /* Assuming that X is an rtx (e.g., MEM, REG or SUBREG) for a fixed-point number, return an rtx (MEM, SUBREG, or CONST_INT) that refers to the least-significant part of X. MODE specifies how big a part of X to return. If the requested operation cannot be done, 0 is returned. This is similar to gen_lowpart_general. */ rtx gen_lowpart_if_possible (enum machine_mode mode, rtx x) { rtx result = gen_lowpart_common (mode, x); if (result) return result; else if (MEM_P (x)) { /* This is the only other case we handle. */ int offset = 0; rtx new; if (WORDS_BIG_ENDIAN) offset = (MAX (GET_MODE_SIZE (GET_MODE (x)), UNITS_PER_WORD) - MAX (GET_MODE_SIZE (mode), UNITS_PER_WORD)); if (BYTES_BIG_ENDIAN) /* Adjust the address so that the address-after-the-data is unchanged. */ offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (mode)) - MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (x)))); new = adjust_address_nv (x, mode, offset); if (! memory_address_p (mode, XEXP (new, 0))) return 0; return new; } else if (mode != GET_MODE (x) && GET_MODE (x) != VOIDmode) return gen_lowpart_SUBREG (mode, x); else return 0; }