1 | /* This file contains definitions for the register renamer. |
2 | Copyright (C) 2011-2023 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 it under |
7 | the terms of the GNU General Public License as published by the Free |
8 | Software Foundation; either version 3, or (at your option) any later |
9 | version. |
10 | |
11 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
12 | WARRANTY; without even the implied warranty of MERCHANTABILITY or |
13 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
14 | 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 | #ifndef GCC_REGRENAME_H |
21 | #define GCC_REGRENAME_H |
22 | |
23 | /* We keep linked lists of DU_HEAD structures, each of which describes |
24 | a chain of occurrences of a reg. */ |
25 | class du_head |
26 | { |
27 | public: |
28 | /* The next chain. */ |
29 | class du_head *next_chain; |
30 | /* The first and last elements of this chain. */ |
31 | struct du_chain *first, *last; |
32 | /* The chain that this chain is tied to. */ |
33 | class du_head *tied_chain; |
34 | /* Describes the register being tracked. */ |
35 | unsigned regno; |
36 | int nregs; |
37 | |
38 | /* A unique id to be used as an index into the conflicts bitmaps. */ |
39 | unsigned id; |
40 | /* A bitmap to record conflicts with other chains. */ |
41 | bitmap_head conflicts; |
42 | /* Conflicts with untracked hard registers. */ |
43 | HARD_REG_SET hard_conflicts; |
44 | /* Which registers are fully or partially clobbered by the calls that |
45 | the chain crosses. */ |
46 | HARD_REG_SET call_clobber_mask; |
47 | |
48 | /* A bitmask of ABIs used by the calls that the chain crosses. */ |
49 | unsigned int call_abis : NUM_ABI_IDS; |
50 | /* Nonzero if the register is used in a way that prevents renaming, |
51 | such as the SET_DEST of a CALL_INSN or an asm operand that used |
52 | to be a hard register. */ |
53 | unsigned int cannot_rename:1; |
54 | /* Nonzero if the chain has already been renamed. */ |
55 | unsigned int renamed:1; |
56 | |
57 | /* Fields for use by target code. */ |
58 | unsigned int target_data_1; |
59 | unsigned int target_data_2; |
60 | }; |
61 | |
62 | typedef class du_head *du_head_p; |
63 | |
64 | /* This struct describes a single occurrence of a register. */ |
65 | struct du_chain |
66 | { |
67 | /* Links to the next occurrence of the register. */ |
68 | struct du_chain *next_use; |
69 | |
70 | /* The insn where the register appears. */ |
71 | rtx_insn *insn; |
72 | /* The location inside the insn. */ |
73 | rtx *loc; |
74 | /* The register class required by the insn at this location. */ |
75 | ENUM_BITFIELD(reg_class) cl : 16; |
76 | }; |
77 | |
78 | /* This struct describes data gathered during regrename_analyze about |
79 | a single operand of an insn. */ |
80 | struct operand_rr_info |
81 | { |
82 | /* The number of chains recorded for this operand. */ |
83 | short n_chains; |
84 | bool failed; |
85 | /* Holds either the chain for the operand itself, or for the registers in |
86 | a memory operand. */ |
87 | struct du_chain *chains[MAX_REGS_PER_ADDRESS]; |
88 | class du_head *heads[MAX_REGS_PER_ADDRESS]; |
89 | }; |
90 | |
91 | /* A struct to hold a vector of operand_rr_info structures describing the |
92 | operands of an insn. */ |
93 | struct insn_rr_info |
94 | { |
95 | operand_rr_info *op_info; |
96 | }; |
97 | |
98 | |
99 | extern vec<insn_rr_info> insn_rr; |
100 | |
101 | extern void regrename_init (bool); |
102 | extern void regrename_finish (void); |
103 | extern void regrename_analyze (bitmap, bool = true); |
104 | extern du_head_p regrename_chain_from_id (unsigned int); |
105 | extern int find_rename_reg (du_head_p, enum reg_class, HARD_REG_SET *, int, |
106 | bool); |
107 | extern bool regrename_do_replace (du_head_p, int); |
108 | extern reg_class regrename_find_superclass (du_head_p, int *, |
109 | HARD_REG_SET *); |
110 | |
111 | #endif |
112 | |