Mercurial > hg > CbC > GCC_original
comparison gcc/lower-subreg.h @ 16:04ced10e8804
gcc 7
author | kono |
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date | Fri, 27 Oct 2017 22:46:09 +0900 |
parents | |
children | 84e7813d76e9 |
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15:561a7518be6b | 16:04ced10e8804 |
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1 /* Target-dependent costs for lower-subreg.c. | |
2 Copyright (C) 2012-2017 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 |