gcc/ssa.h

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