| /* Target-dependent costs for lower-subreg.c. |
| Copyright (C) 2012-2017 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]; |
| bool splitting_ashiftrt[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. */ |
| 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 |