| 1 | /* Routines for expanding from SSA form to RTL. |
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| 2 | Copyright (C) 2009-2025 Free Software Foundation, Inc. |
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| 3 | |
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| 4 | This file is part of GCC. |
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| 5 | |
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| 6 | GCC is free software; you can redistribute it and/or modify |
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| 7 | it under the terms of the GNU General Public License as published by |
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| 8 | the Free Software Foundation; either version 3, or (at your option) |
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| 9 | any later version. |
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| 10 | |
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| 11 | GCC is distributed in the hope that it will be useful, |
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| 12 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 13 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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| 14 | GNU General Public License for more details. |
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| 15 | |
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| 16 | You should have received a copy of the GNU General Public License |
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| 17 | along with GCC; see the file COPYING3. If not see |
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| 18 | <http://www.gnu.org/licenses/>. */ |
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| 19 | |
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| 20 | |
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| 21 | #ifndef GCC_TREE_OUTOF_SSA_H |
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| 22 | #define GCC_TREE_OUTOF_SSA_H |
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| 23 | |
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| 24 | |
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| 25 | /* This structure (of which only a singleton SA exists) is used to |
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| 26 | pass around information between the outof-SSA functions, cfgexpand |
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| 27 | and expand itself. */ |
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| 28 | struct ssaexpand |
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| 29 | { |
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| 30 | /* The computed partitions of SSA names are stored here. */ |
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| 31 | var_map map; |
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| 32 | |
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| 33 | /* For an SSA name version V bit V is set iff TER decided that |
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| 34 | its definition should be forwarded. */ |
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| 35 | bitmap values; |
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| 36 | |
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| 37 | /* For a partition number I partition_to_pseudo[I] contains the |
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| 38 | RTL expression of the allocated space of it (either a MEM or |
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| 39 | a pseudos REG). */ |
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| 40 | rtx *partition_to_pseudo; |
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| 41 | |
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| 42 | /* If partition I contains an SSA name that has a default def for a |
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| 43 | parameter, bit I will be set in this bitmap. */ |
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| 44 | bitmap partitions_for_parm_default_defs; |
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| 45 | |
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| 46 | /* If partition I contains an SSA name that has an undefined value, |
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| 47 | bit I will be set in this bitmap. */ |
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| 48 | bitmap partitions_for_undefined_values; |
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| 49 | }; |
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| 50 | |
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| 51 | /* This is the singleton described above. */ |
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| 52 | extern struct ssaexpand SA; |
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| 53 | |
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| 54 | /* Returns the RTX expression representing the storage of the outof-SSA |
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| 55 | partition that the SSA name EXP is a member of. */ |
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| 56 | inline rtx |
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| 57 | get_rtx_for_ssa_name (tree exp) |
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| 58 | { |
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| 59 | int p = partition_find (SA.map->var_partition, SSA_NAME_VERSION (exp)); |
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| 60 | if (SA.map->partition_to_view) |
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| 61 | p = SA.map->partition_to_view[p]; |
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| 62 | gcc_assert (p != NO_PARTITION); |
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| 63 | return SA.partition_to_pseudo[p]; |
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| 64 | } |
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| 65 | |
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| 66 | /* If TER decided to forward the definition of SSA name EXP this function |
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| 67 | returns the defining statement, otherwise NULL. */ |
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| 68 | inline gimple * |
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| 69 | get_gimple_for_ssa_name (tree exp) |
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| 70 | { |
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| 71 | int v = SSA_NAME_VERSION (exp); |
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| 72 | if (SA.values && bitmap_bit_p (SA.values, v)) |
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| 73 | return SSA_NAME_DEF_STMT (exp); |
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| 74 | return NULL; |
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| 75 | } |
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| 76 | |
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| 77 | extern bool ssa_is_replaceable_p (gimple *stmt); |
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| 78 | extern void finish_out_of_ssa (struct ssaexpand *sa); |
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| 79 | extern unsigned int rewrite_out_of_ssa (struct ssaexpand *sa); |
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| 80 | extern void expand_phi_nodes (struct ssaexpand *sa); |
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| 81 | |
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| 82 | #endif /* GCC_TREE_OUTOF_SSA_H */ |
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| 83 | |
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