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/* Target-dependent costs for lower-subreg.c.
Copyright (C) 2012 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/>. */
#ifndef LOWER_SUBREG_H
#define LOWER_SUBREG_H 1
/* Information about whether, and where, lower-subreg should be applied. */
struct lower_subreg_choices {
/* A boolean vector for move splitting that is indexed by mode and is
true for each mode that is to have its copies split. */
bool move_modes_to_split[MAX_MACHINE_MODE];
/* True if zero-extensions from word_mode to twice_word_mode should
be split. */
bool splitting_zext;
/* Index X is true if twice_word_mode shifts by X + BITS_PER_WORD
should be split. */
bool splitting_ashift[MAX_BITS_PER_WORD];
bool splitting_lshiftrt[MAX_BITS_PER_WORD];
/* True if there is at least one mode that is worth splitting. */
bool something_to_do;
};
/* Target-specific information for the subreg lowering pass. */
struct target_lower_subreg {
/* An integer mode that is twice as wide as word_mode. */
enum machine_mode x_twice_word_mode;
/* What we have decided to do when optimizing for size (index 0)
and speed (index 1). */
struct lower_subreg_choices x_choices[2];
};
extern struct target_lower_subreg default_target_lower_subreg;
#if SWITCHABLE_TARGET
extern struct target_lower_subreg *this_target_lower_subreg;
#else
#define this_target_lower_subreg (&default_target_lower_subreg)
#endif
#endif
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