103 lines
3.3 KiB
C
103 lines
3.3 KiB
C
/* Generic hooks for the RTL middle-end.
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Copyright (C) 2004 Free Software Foundation, Inc.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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#include "config.h"
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#include "system.h"
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#include "coretypes.h"
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#include "tm.h"
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#include "rtl.h"
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#include "rtlhooks-def.h"
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#include "expr.h"
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/* For speed, we will copy the RTX hooks struct member-by-member
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instead of doing indirect calls. For these reason, we initialize
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*two* struct rtl_hooks globals: rtl_hooks is the one that is used
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to actually call the hooks, while general_rtl_hooks is used
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to restore the hooks by passes that modify them. */
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const struct rtl_hooks general_rtl_hooks = RTL_HOOKS_INITIALIZER;
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struct rtl_hooks rtl_hooks = RTL_HOOKS_INITIALIZER;
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rtx
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gen_lowpart_general (enum machine_mode mode, rtx x)
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{
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rtx result = gen_lowpart_common (mode, x);
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if (result)
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return result;
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else if (REG_P (x))
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{
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/* Must be a hard reg that's not valid in MODE. */
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result = gen_lowpart_common (mode, copy_to_reg (x));
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gcc_assert (result != 0);
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return result;
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}
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else
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{
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int offset = 0;
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/* The only additional case we can do is MEM. */
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gcc_assert (MEM_P (x));
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/* The following exposes the use of "x" to CSE. */
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if (GET_MODE_SIZE (GET_MODE (x)) <= UNITS_PER_WORD
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&& SCALAR_INT_MODE_P (GET_MODE (x))
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&& TRULY_NOOP_TRUNCATION (GET_MODE_BITSIZE (mode),
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GET_MODE_BITSIZE (GET_MODE (x)))
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&& ! no_new_pseudos)
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return gen_lowpart_general (mode, force_reg (GET_MODE (x), x));
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if (WORDS_BIG_ENDIAN)
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offset = (MAX (GET_MODE_SIZE (GET_MODE (x)), UNITS_PER_WORD)
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- MAX (GET_MODE_SIZE (mode), UNITS_PER_WORD));
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if (BYTES_BIG_ENDIAN)
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/* Adjust the address so that the address-after-the-data
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is unchanged. */
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offset -= (MIN (UNITS_PER_WORD, GET_MODE_SIZE (mode))
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- MIN (UNITS_PER_WORD, GET_MODE_SIZE (GET_MODE (x))));
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return adjust_address (x, mode, offset);
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}
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}
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rtx
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reg_num_sign_bit_copies_general (rtx x ATTRIBUTE_UNUSED,
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enum machine_mode mode ATTRIBUTE_UNUSED,
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rtx known_x ATTRIBUTE_UNUSED,
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enum machine_mode known_mode ATTRIBUTE_UNUSED,
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unsigned int known_ret ATTRIBUTE_UNUSED,
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unsigned int *result ATTRIBUTE_UNUSED)
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{
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return NULL;
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}
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rtx
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reg_nonzero_bits_general (rtx x ATTRIBUTE_UNUSED,
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enum machine_mode mode ATTRIBUTE_UNUSED,
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rtx known_x ATTRIBUTE_UNUSED,
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enum machine_mode known_mode ATTRIBUTE_UNUSED,
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unsigned HOST_WIDE_INT known_ret ATTRIBUTE_UNUSED,
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unsigned HOST_WIDE_INT *nonzero ATTRIBUTE_UNUSED)
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{
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return NULL;
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}
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