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comparison gcc/ssaexpand.h @ 55:77e2b8dfacca gcc-4.4.5

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update it from 4.4.3 to 4.5.0
author ryoma <e075725@ie.u-ryukyu.ac.jp>
date Fri, 12 Feb 2010 23:39:51 +0900
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52:c156f1bd5cd9 55:77e2b8dfacca
1 /* Routines for expanding from SSA form to RTL.
2 Copyright (C) 2009 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
7 it under the terms of the GNU General Public License as published by
8 the Free Software Foundation; either version 3, or (at your option)
9 any later version.
10
11 GCC is distributed in the hope that it will be useful,
12 but WITHOUT ANY WARRANTY; without even the implied warranty of
13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 GNU General Public License 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
21 #ifndef _SSAEXPAND_H
22 #define _SSAEXPAND_H 1
23
24 #include "tree-ssa-live.h"
25
26 /* This structure (of which only a singleton SA exists) is used to
27 pass around information between the outof-SSA functions, cfgexpand
28 and expand itself. */
29 struct ssaexpand
30 {
31 /* The computed partitions of SSA names are stored here. */
32 var_map map;
33
34 /* For an SSA name version V bit V is set iff TER decided that
35 its definition should be forwarded. */
36 bitmap values;
37
38 /* For a partition number I partition_to_pseudo[I] contains the
39 RTL expression of the allocated space of it (either a MEM or
40 a pseudos REG). */
41 rtx *partition_to_pseudo;
42
43 /* If partition I contains an SSA name that has a default def,
44 bit I will be set in this bitmap. */
45 bitmap partition_has_default_def;
46 };
47
48 /* This is the singleton described above. */
49 extern struct ssaexpand SA;
50
51 /* Returns the RTX expression representing the storage of the outof-SSA
52 partition that the SSA name EXP is a member of. */
53 static inline rtx
54 get_rtx_for_ssa_name (tree exp)
55 {
56 int p = partition_find (SA.map->var_partition, SSA_NAME_VERSION (exp));
57 if (SA.map->partition_to_view)
58 p = SA.map->partition_to_view[p];
59 gcc_assert (p != NO_PARTITION);
60 return SA.partition_to_pseudo[p];
61 }
62
63 /* If TER decided to forward the definition of SSA name EXP this function
64 returns the defining statement, otherwise NULL. */
65 static inline gimple
66 get_gimple_for_ssa_name (tree exp)
67 {
68 int v = SSA_NAME_VERSION (exp);
69 if (SA.values && bitmap_bit_p (SA.values, v))
70 return SSA_NAME_DEF_STMT (exp);
71 return NULL;
72 }
73
74 /* In tree-outof-ssa.c. */
75 void finish_out_of_ssa (struct ssaexpand *sa);
76 unsigned int rewrite_out_of_ssa (struct ssaexpand *sa);
77 void expand_phi_nodes (struct ssaexpand *sa);
78
79 #endif