| /* Generic hooks for the RTL middle-end. |
| Copyright (C) 2004 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 2, 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 COPYING. If not, write to the Free |
| Software Foundation, 59 Temple Place - Suite 330, Boston, MA |
| 02111-1307, USA. */ |
| |
| #include "config.h" |
| #include "system.h" |
| #include "coretypes.h" |
| #include "tm.h" |
| #include "rtl.h" |
| #include "rtlhooks-def.h" |
| #include "expr.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; |
| else if (REG_P (x)) |
| { |
| /* Must be a hard reg that's not valid in MODE. */ |
| 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); |
| } |
| } |
| |
| 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; |
| } |