61 lines
2.0 KiB
C
61 lines
2.0 KiB
C
/* Target-dependent costs for lower-subreg.c.
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Copyright (C) 2012-2014 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 3, 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 COPYING3. If not see
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<http://www.gnu.org/licenses/>. */
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#ifndef LOWER_SUBREG_H
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#define LOWER_SUBREG_H 1
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/* Information about whether, and where, lower-subreg should be applied. */
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struct lower_subreg_choices {
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/* A boolean vector for move splitting that is indexed by mode and is
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true for each mode that is to have its copies split. */
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bool move_modes_to_split[MAX_MACHINE_MODE];
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/* True if zero-extensions from word_mode to twice_word_mode should
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be split. */
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bool splitting_zext;
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/* Index X is true if twice_word_mode shifts by X + BITS_PER_WORD
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should be split. */
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bool splitting_ashift[MAX_BITS_PER_WORD];
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bool splitting_lshiftrt[MAX_BITS_PER_WORD];
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bool splitting_ashiftrt[MAX_BITS_PER_WORD];
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/* True if there is at least one mode that is worth splitting. */
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bool something_to_do;
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};
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/* Target-specific information for the subreg lowering pass. */
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struct target_lower_subreg {
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/* An integer mode that is twice as wide as word_mode. */
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enum machine_mode x_twice_word_mode;
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/* What we have decided to do when optimizing for size (index 0)
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and speed (index 1). */
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struct lower_subreg_choices x_choices[2];
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};
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extern struct target_lower_subreg default_target_lower_subreg;
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#if SWITCHABLE_TARGET
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extern struct target_lower_subreg *this_target_lower_subreg;
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#else
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#define this_target_lower_subreg (&default_target_lower_subreg)
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#endif
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#endif
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