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72 lines
2.5 KiB
C
72 lines
2.5 KiB
C
/* Static Single Assignment (SSA) definitions for GNU C-Compiler
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Copyright (C) 2000, 2001 Free Software Foundation, Inc.
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Written by Jeffrey D. Oldham <oldham@codesourcery.com>.
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This file is part of GCC.
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GCC is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free
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Software Foundation; either version 2, or (at your option) any later
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version.
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GCC is distributed in the hope that it will be useful, but WITHOUT ANY
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WARRANTY; without even the implied warranty of MERCHANTABILITY or
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FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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for more details.
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You should have received a copy of the GNU General Public License
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along with GCC; see the file COPYING. If not, write to the Free
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Software Foundation, 59 Temple Place - Suite 330, Boston, MA
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02111-1307, USA. */
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/* Main SSA routines. */
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extern void convert_to_ssa PARAMS ((void));
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extern void convert_from_ssa PARAMS ((void));
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typedef int (*successor_phi_fn) PARAMS ((rtx, int, int, void *));
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extern int for_each_successor_phi PARAMS ((basic_block bb,
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successor_phi_fn,
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void *));
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void compute_dominance_frontiers PARAMS ((sbitmap *frontiers, int *idom));
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extern int remove_phi_alternative PARAMS ((rtx, basic_block));
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/* Optimizations. */
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/* In ssa-dce.c */
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extern void ssa_eliminate_dead_code PARAMS ((void));
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/* In ssa-ccp.c */
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extern void ssa_const_prop PARAMS ((void));
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/* SSA definitions and uses. */
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/* This flag is set when the CFG is in SSA form. */
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extern int in_ssa_form;
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/* Element I is the single instruction that sets register I. */
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extern varray_type ssa_definition;
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/* Element I is an INSN_LIST of instructions that use register I. */
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extern varray_type ssa_uses;
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/* Specify which hard registers should be converted. */
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/* All pseudo-registers (having register number >=
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FIRST_PSEUDO_REGISTER) and hard registers satisfying
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CONVERT_HARD_REGISTER_TO_SSA_P are converted to SSA form. */
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/* Given a hard register number REG_NO, return nonzero if and only if
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the register should be converted to SSA. */
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#ifndef CONVERT_HARD_REGISTER_TO_SSA_P
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#define CONVERT_HARD_REGISTER_TO_SSA_P(REG_NO) (0) /* default of no hard registers */
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#endif /* CONVERT_HARD_REGISTER_TO_SSA_P */
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/* Given a register number REG_NO, return nonzero if and only if the
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register should be converted to SSA. */
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#define CONVERT_REGISTER_TO_SSA_P(REG_NO) \
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((!HARD_REGISTER_NUM_P (REG_NO)) || \
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(CONVERT_HARD_REGISTER_TO_SSA_P (REG_NO)))
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