1 | /* Target-dependent costs for lower-subreg.cc. |
2 | Copyright (C) 2012-2023 Free Software Foundation, Inc. |
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 |
8 | Software Foundation; either version 3, or (at your option) any later |
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]; |
37 | bool splitting_ashiftrt[MAX_BITS_PER_WORD]; |
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. */ |
46 | scalar_int_mode_pod x_twice_word_mode; |
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 |
61 | |