b53978a3ee
* Makefile.in (OBJS): Added dce.o. (ssa.o): Updated target to include ssa.h. (flow.o): Likewise. (toplev.o): Likewise. (dce.o): Created target. * basic-block.h: Added comments. (INVALID_BLOCK): Added definition. (connect_infinite_loops_to_exit): Added declaration. Moved SSA declarations to ssa.h. * flow.c: Added inclusion of ssa.h. (struct depth_first_search_dsS, depth_first_search_ds): Added definitions. (compute_immediate_postdominators): Added definition. (connect_infinite_loops_to_exit): Likewise. (flow_dfs_compute_reverse_init): Likewise. (flow_dfs_compute_reverse_add_bb): Likewise. (flow_dfs_compute_reverse_execute): Likewise. (flow_dfs_compute_reverse_finish): Likewise. * rtl.h (rtx/in_struct): Added use to determine insn necessity. (LABEL_P): Added definition. (JUMP_P): Likewise. (NOTE_P): Likewise. (BARRIER_P): Likewise. (JUMP_TABLE_DATA_P): Likewise. (INSN_DEAD_CODE_P): Likewise. * ssa.c: Replaced inclusions with ssa.h inclusion. (CONVERT_HARD_REGISTER_TO_SSA_P): Moved to ssa.h. (rename_registers): Removed unnecessary variables. * ssa.h: Created by moving declarations from ssa.c and basic-block.h. * timevar.def: Defined TV_DEAD_CODE_ELIM. * toplev.c: Added ssa.h inclusion. (dump_file_index): Added DFI_dce. (dump_file): Added "dce" entry. Defined flag_ssa. (f_options): Added dce entry. * invoke.texi: Document -fdce. Emphasize experimental status of -fssa. Co-Authored-By: Mark Mitchell <mark@codesourcery.com> From-SVN: r35419
65 lines
2.3 KiB
C
65 lines
2.3 KiB
C
/* Static Single Assignment (SSA) definitions for GNU C-Compiler
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Copyright (C) 2000 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 GNU CC.
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GNU CC is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU CC is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License 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 GNU CC; see the file COPYING. If not, write to
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the Free Software Foundation, 59 Temple Place - Suite 330,
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Boston, MA 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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/* Optimizations. */
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/* In dce.c */
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extern void eliminate_dead_code 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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