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af4ba423 | 1 | /* Target-dependent costs for lower-subreg.c. |
99dee823 | 2 | Copyright (C) 2012-2021 Free Software Foundation, Inc. |
af4ba423 KZ |
3 | |
4 | This file is part of GCC. | |
5 | ||
6 | GCC is free software; you can redistribute it and/or modify it under | |
7 | the terms of the GNU General Public License as published by the Free | |
ee7d63ab | 8 | Software Foundation; either version 3, or (at your option) any later |
af4ba423 KZ |
9 | version. |
10 | ||
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY | |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
14 | for more details. | |
15 | ||
16 | You should have received a copy of the GNU General Public License | |
17 | along with GCC; see the file COPYING3. If not see | |
18 | <http://www.gnu.org/licenses/>. */ | |
19 | ||
20 | #ifndef LOWER_SUBREG_H | |
21 | #define LOWER_SUBREG_H 1 | |
22 | ||
23 | /* Information about whether, and where, lower-subreg should be applied. */ | |
24 | struct lower_subreg_choices { | |
25 | /* A boolean vector for move splitting that is indexed by mode and is | |
26 | true for each mode that is to have its copies split. */ | |
27 | bool move_modes_to_split[MAX_MACHINE_MODE]; | |
28 | ||
29 | /* True if zero-extensions from word_mode to twice_word_mode should | |
30 | be split. */ | |
31 | bool splitting_zext; | |
32 | ||
33 | /* Index X is true if twice_word_mode shifts by X + BITS_PER_WORD | |
34 | should be split. */ | |
35 | bool splitting_ashift[MAX_BITS_PER_WORD]; | |
36 | bool splitting_lshiftrt[MAX_BITS_PER_WORD]; | |
d7fde18c | 37 | bool splitting_ashiftrt[MAX_BITS_PER_WORD]; |
af4ba423 KZ |
38 | |
39 | /* True if there is at least one mode that is worth splitting. */ | |
40 | bool something_to_do; | |
41 | }; | |
42 | ||
43 | /* Target-specific information for the subreg lowering pass. */ | |
44 | struct target_lower_subreg { | |
45 | /* An integer mode that is twice as wide as word_mode. */ | |
bf862c53 | 46 | scalar_int_mode_pod x_twice_word_mode; |
af4ba423 KZ |
47 | |
48 | /* What we have decided to do when optimizing for size (index 0) | |
49 | and speed (index 1). */ | |
50 | struct lower_subreg_choices x_choices[2]; | |
51 | }; | |
52 | ||
53 | extern struct target_lower_subreg default_target_lower_subreg; | |
54 | #if SWITCHABLE_TARGET | |
55 | extern struct target_lower_subreg *this_target_lower_subreg; | |
56 | #else | |
57 | #define this_target_lower_subreg (&default_target_lower_subreg) | |
58 | #endif | |
59 | ||
60 | #endif |