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4e3825db | 1 | /* Routines for expanding from SSA form to RTL. |
7adcbafe | 2 | Copyright (C) 2009-2022 Free Software Foundation, Inc. |
4e3825db MM |
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 | ||
80560f95 AM |
21 | #ifndef GCC_TREE_OUTOF_SSA_H |
22 | #define GCC_TREE_OUTOF_SSA_H | |
4e3825db | 23 | |
4e3825db MM |
24 | |
25 | /* This structure (of which only a singleton SA exists) is used to | |
26 | pass around information between the outof-SSA functions, cfgexpand | |
27 | and expand itself. */ | |
28 | struct ssaexpand | |
29 | { | |
30 | /* The computed partitions of SSA names are stored here. */ | |
31 | var_map map; | |
32 | ||
e97809c6 MM |
33 | /* For an SSA name version V bit V is set iff TER decided that |
34 | its definition should be forwarded. */ | |
35 | bitmap values; | |
4e3825db MM |
36 | |
37 | /* For a partition number I partition_to_pseudo[I] contains the | |
38 | RTL expression of the allocated space of it (either a MEM or | |
39 | a pseudos REG). */ | |
40 | rtx *partition_to_pseudo; | |
41 | ||
f11a7b6d AO |
42 | /* If partition I contains an SSA name that has a default def for a |
43 | parameter, bit I will be set in this bitmap. */ | |
44 | bitmap partitions_for_parm_default_defs; | |
561593c1 EB |
45 | |
46 | /* If partition I contains an SSA name that has an undefined value, | |
47 | bit I will be set in this bitmap. */ | |
48 | bitmap partitions_for_undefined_values; | |
4e3825db MM |
49 | }; |
50 | ||
51 | /* This is the singleton described above. */ | |
52 | extern struct ssaexpand SA; | |
53 | ||
54 | /* Returns the RTX expression representing the storage of the outof-SSA | |
55 | partition that the SSA name EXP is a member of. */ | |
56 | static inline rtx | |
57 | get_rtx_for_ssa_name (tree exp) | |
58 | { | |
59 | int p = partition_find (SA.map->var_partition, SSA_NAME_VERSION (exp)); | |
60 | if (SA.map->partition_to_view) | |
61 | p = SA.map->partition_to_view[p]; | |
62 | gcc_assert (p != NO_PARTITION); | |
63 | return SA.partition_to_pseudo[p]; | |
64 | } | |
65 | ||
66 | /* If TER decided to forward the definition of SSA name EXP this function | |
67 | returns the defining statement, otherwise NULL. */ | |
355fe088 | 68 | static inline gimple * |
4e3825db MM |
69 | get_gimple_for_ssa_name (tree exp) |
70 | { | |
71 | int v = SSA_NAME_VERSION (exp); | |
e97809c6 MM |
72 | if (SA.values && bitmap_bit_p (SA.values, v)) |
73 | return SSA_NAME_DEF_STMT (exp); | |
4e3825db MM |
74 | return NULL; |
75 | } | |
76 | ||
355fe088 | 77 | extern bool ssa_is_replaceable_p (gimple *stmt); |
78bca40d AM |
78 | extern void finish_out_of_ssa (struct ssaexpand *sa); |
79 | extern unsigned int rewrite_out_of_ssa (struct ssaexpand *sa); | |
80 | extern void expand_phi_nodes (struct ssaexpand *sa); | |
4e3825db | 81 | |
80560f95 | 82 | #endif /* GCC_TREE_OUTOF_SSA_H */ |