1*38fd1498Szrj /* Routines for expanding from SSA form to RTL.
2*38fd1498Szrj    Copyright (C) 2009-2018 Free Software Foundation, Inc.
3*38fd1498Szrj 
4*38fd1498Szrj This file is part of GCC.
5*38fd1498Szrj 
6*38fd1498Szrj GCC is free software; you can redistribute it and/or modify
7*38fd1498Szrj it under the terms of the GNU General Public License as published by
8*38fd1498Szrj the Free Software Foundation; either version 3, or (at your option)
9*38fd1498Szrj any later version.
10*38fd1498Szrj 
11*38fd1498Szrj GCC is distributed in the hope that it will be useful,
12*38fd1498Szrj but WITHOUT ANY WARRANTY; without even the implied warranty of
13*38fd1498Szrj MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
14*38fd1498Szrj GNU General Public License for more details.
15*38fd1498Szrj 
16*38fd1498Szrj You should have received a copy of the GNU General Public License
17*38fd1498Szrj along with GCC; see the file COPYING3.  If not see
18*38fd1498Szrj <http://www.gnu.org/licenses/>.  */
19*38fd1498Szrj 
20*38fd1498Szrj 
21*38fd1498Szrj #ifndef GCC_TREE_OUTOF_SSA_H
22*38fd1498Szrj #define GCC_TREE_OUTOF_SSA_H
23*38fd1498Szrj 
24*38fd1498Szrj 
25*38fd1498Szrj /* This structure (of which only a singleton SA exists) is used to
26*38fd1498Szrj    pass around information between the outof-SSA functions, cfgexpand
27*38fd1498Szrj    and expand itself.  */
28*38fd1498Szrj struct ssaexpand
29*38fd1498Szrj {
30*38fd1498Szrj   /* The computed partitions of SSA names are stored here.  */
31*38fd1498Szrj   var_map map;
32*38fd1498Szrj 
33*38fd1498Szrj   /* For an SSA name version V bit V is set iff TER decided that
34*38fd1498Szrj      its definition should be forwarded.  */
35*38fd1498Szrj   bitmap values;
36*38fd1498Szrj 
37*38fd1498Szrj   /* For a partition number I partition_to_pseudo[I] contains the
38*38fd1498Szrj      RTL expression of the allocated space of it (either a MEM or
39*38fd1498Szrj      a pseudos REG).  */
40*38fd1498Szrj   rtx *partition_to_pseudo;
41*38fd1498Szrj 
42*38fd1498Szrj   /* If partition I contains an SSA name that has a default def for a
43*38fd1498Szrj      parameter, bit I will be set in this bitmap.  */
44*38fd1498Szrj   bitmap partitions_for_parm_default_defs;
45*38fd1498Szrj 
46*38fd1498Szrj   /* If partition I contains an SSA name that has an undefined value,
47*38fd1498Szrj      bit I will be set in this bitmap.  */
48*38fd1498Szrj   bitmap partitions_for_undefined_values;
49*38fd1498Szrj };
50*38fd1498Szrj 
51*38fd1498Szrj /* This is the singleton described above.  */
52*38fd1498Szrj extern struct ssaexpand SA;
53*38fd1498Szrj 
54*38fd1498Szrj /* Returns the RTX expression representing the storage of the outof-SSA
55*38fd1498Szrj    partition that the SSA name EXP is a member of.  */
56*38fd1498Szrj static inline rtx
get_rtx_for_ssa_name(tree exp)57*38fd1498Szrj get_rtx_for_ssa_name (tree exp)
58*38fd1498Szrj {
59*38fd1498Szrj   int p = partition_find (SA.map->var_partition, SSA_NAME_VERSION (exp));
60*38fd1498Szrj   if (SA.map->partition_to_view)
61*38fd1498Szrj     p = SA.map->partition_to_view[p];
62*38fd1498Szrj   gcc_assert (p != NO_PARTITION);
63*38fd1498Szrj   return SA.partition_to_pseudo[p];
64*38fd1498Szrj }
65*38fd1498Szrj 
66*38fd1498Szrj /* If TER decided to forward the definition of SSA name EXP this function
67*38fd1498Szrj    returns the defining statement, otherwise NULL.  */
68*38fd1498Szrj static inline gimple *
get_gimple_for_ssa_name(tree exp)69*38fd1498Szrj get_gimple_for_ssa_name (tree exp)
70*38fd1498Szrj {
71*38fd1498Szrj   int v = SSA_NAME_VERSION (exp);
72*38fd1498Szrj   if (SA.values && bitmap_bit_p (SA.values, v))
73*38fd1498Szrj     return SSA_NAME_DEF_STMT (exp);
74*38fd1498Szrj   return NULL;
75*38fd1498Szrj }
76*38fd1498Szrj 
77*38fd1498Szrj extern bool ssa_is_replaceable_p (gimple *stmt);
78*38fd1498Szrj extern void finish_out_of_ssa (struct ssaexpand *sa);
79*38fd1498Szrj extern unsigned int rewrite_out_of_ssa (struct ssaexpand *sa);
80*38fd1498Szrj extern void expand_phi_nodes (struct ssaexpand *sa);
81*38fd1498Szrj 
82*38fd1498Szrj #endif /* GCC_TREE_OUTOF_SSA_H */
83