git://gcc.gnu.org / gcc.git / blame
| Commit | Line | Data |
|---|---|---|
| b53978a3 | 1 | /* Static Single Assignment (SSA) definitions for GNU C-Compiler |
| fd9305ef | 2 | Copyright (C) 2000, 2001 Free Software Foundation, Inc. |
| b53978a3 JO |
3 | Written by Jeffrey D. Oldham <oldham@codesourcery.com>. |
| 4 | ||
| 1322177d | 5 | This file is part of GCC. |
| b53978a3 | 6 | |
| 1322177d LB |
7 | GCC is free software; you can redistribute it and/or modify it under |
| 8 | the terms of the GNU General Public License as published by the Free | |
| 9 | Software Foundation; either version 2, or (at your option) any later | |
| 10 | version. | |
| b53978a3 | 11 | |
| 1322177d LB |
12 | GCC is distributed in the hope that it will be useful, but WITHOUT ANY |
| 13 | WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 14 | FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 15 | for more details. | |
| b53978a3 JO |
16 | |
| 17 | You should have received a copy of the GNU General Public License | |
| 1322177d LB |
18 | along with GCC; see the file COPYING. If not, write to the Free |
| 19 | Software Foundation, 59 Temple Place - Suite 330, Boston, MA | |
| 20 | 02111-1307, USA. */ | |
| b53978a3 JO |
21 | |
| 22 | ||
| 23 | /* Main SSA routines. */ | |
| 24 | extern void convert_to_ssa PARAMS ((void)); | |
| 25 | extern void convert_from_ssa PARAMS ((void)); | |
| 26 | typedef int (*successor_phi_fn) PARAMS ((rtx, int, int, void *)); | |
| 27 | extern int for_each_successor_phi PARAMS ((basic_block bb, | |
| 28 | successor_phi_fn, | |
| 29 | void *)); | |
| 316dcdf6 | 30 | void compute_dominance_frontiers PARAMS ((sbitmap *frontiers, int *idom)); |
| fd9305ef JL |
31 | extern int remove_phi_alternative PARAMS ((rtx, basic_block)); |
| 32 | ||
| b53978a3 JO |
33 | |
| 34 | /* Optimizations. */ | |
| fd9305ef | 35 | /* In ssa-dce.c */ |
| 62d285ff | 36 | extern void ssa_eliminate_dead_code PARAMS ((void)); |
| b53978a3 | 37 | |
| af5c573a JL |
38 | /* In ssa-ccp.c */ |
| 39 | extern void ssa_const_prop PARAMS ((void)); | |
| 40 | ||
| 41 | ||
| b53978a3 JO |
42 | /* SSA definitions and uses. */ |
| 43 | /* This flag is set when the CFG is in SSA form. */ | |
| 44 | extern int in_ssa_form; | |
| 45 | ||
| 46 | /* Element I is the single instruction that sets register I. */ | |
| 47 | extern varray_type ssa_definition; | |
| 48 | ||
| 49 | /* Element I is an INSN_LIST of instructions that use register I. */ | |
| 50 | extern varray_type ssa_uses; | |
| 51 | ||
| 52 | ||
| 53 | /* Specify which hard registers should be converted. */ | |
| 54 | ||
| 55 | /* All pseudo-registers (having register number >= | |
| 56 | FIRST_PSEUDO_REGISTER) and hard registers satisfying | |
| 57 | CONVERT_HARD_REGISTER_TO_SSA_P are converted to SSA form. */ | |
| 58 | ||
| 59 | /* Given a hard register number REG_NO, return nonzero if and only if | |
| 60 | the register should be converted to SSA. */ | |
| 61 | ||
| 62 | #ifndef CONVERT_HARD_REGISTER_TO_SSA_P | |
| 63 | #define CONVERT_HARD_REGISTER_TO_SSA_P(REG_NO) (0) /* default of no hard registers */ | |
| 64 | #endif /* CONVERT_HARD_REGISTER_TO_SSA_P */ | |
| 65 | ||
| 66 | /* Given a register number REG_NO, return nonzero if and only if the | |
| 67 | register should be converted to SSA. */ | |
| 68 | ||
| 69 | #define CONVERT_REGISTER_TO_SSA_P(REG_NO) \ | |
| 70 | ((!HARD_REGISTER_NUM_P (REG_NO)) || \ | |
| 71 | (CONVERT_HARD_REGISTER_TO_SSA_P (REG_NO))) |