GCC Middle and Back End API Reference
gcse.h
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1 /* Global common subexpression elimination/Partial redundancy elimination
2  and global constant/copy propagation for GNU compiler.
3  Copyright (C) 1997-2013 Free Software Foundation, Inc.
4 
5 This file is part of GCC.
6 
7 GCC is free software; you can redistribute it and/or modify it under
8 the terms of the GNU General Public License as published by the Free
9 Software Foundation; either version 3, or (at your option) any later
10 version.
11 
12 GCC is distributed in the hope that it will be useful, but WITHOUT ANY
13 WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 for more details.
16 
17 You should have received a copy of the GNU General Public License
18 along with GCC; see the file COPYING3. If not see
19 <http://www.gnu.org/licenses/>. */
20 
21 #ifndef GCC_GCSE_H
22 #define GCC_GCSE_H
23 
24 /* Target-dependent globals. */
25 struct target_gcse {
26  /* Nonzero for each mode that supports (set (reg) (reg)).
27  This is trivially true for integer and floating point values.
28  It may or may not be true for condition codes. */
29  char x_can_copy[(int) NUM_MACHINE_MODES];
30 
31  /* True if the previous field has been initialized. */
33 };
34 
35 extern GTY(()) struct target_gcse default_target_gcse;
36 #if SWITCHABLE_TARGET
37 extern struct target_gcse *this_target_gcse;
38 #else
39 #define this_target_gcse (&default_target_gcse)
40 #endif
41 
42 #endif