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1 /* Routines for expanding from SSA form to RTL.
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145
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2 Copyright (C) 2009-2020 Free Software Foundation, Inc.
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111
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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 static 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 static 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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