comparison gcc/lower-subreg.h @ 16:04ced10e8804

gcc 7
author kono
date Fri, 27 Oct 2017 22:46:09 +0900
parents
children 84e7813d76e9
comparison
equal deleted inserted replaced
15:561a7518be6b 16:04ced10e8804
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