gcc/ssa.h

   1 /* Static Single Assignment (SSA) definitions for GCC
   2    Copyright (C) 2000, 2001, 2003 Free Software Foundation, Inc.
   3    Written by Jeffrey D. Oldham <oldham@codesourcery.com>.
   4
   5 This file is part of GCC.
   6
   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.
  11
  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.
  16
  17 You should have received a copy of the GNU General Public License
  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.  */
  21
  22
  23 /* Main SSA routines.  */
  24 extern void convert_to_ssa (void);
  25 extern void convert_from_ssa (void);
  26 typedef int (*successor_phi_fn) (rtx, int, int, void *);
  27 extern int for_each_successor_phi (basic_block bb, successor_phi_fn,
  28                                    void *);
  29 void compute_dominance_frontiers (sbitmap *frontiers, dominance_info idom);
  30 extern int remove_phi_alternative (rtx, basic_block);
  31
  32
  33 /* Optimizations.  */
  34 /* In ssa-dce.c */
  35 extern void ssa_eliminate_dead_code (void);
  36
  37 /* In ssa-ccp.c */
  38 extern void ssa_const_prop (void);
  39
  40
  41 /* SSA definitions and uses.  */
  42 /* This flag is set when the CFG is in SSA form.  */
  43 extern int in_ssa_form;
  44
  45 /* Element I is the single instruction that sets register I.  */
  46 extern GTY(()) varray_type ssa_definition;
  47
  48 /* Element I is an INSN_LIST of instructions that use register I.  */
  49 extern varray_type ssa_uses;
  50
  51
  52 /* Specify which hard registers should be converted.  */
  53
  54 /* All pseudo-registers (having register number >=
  55    FIRST_PSEUDO_REGISTER) and hard registers satisfying
  56    CONVERT_HARD_REGISTER_TO_SSA_P are converted to SSA form.  */
  57
  58 /* Given a hard register number REG_NO, return nonzero if and only if
  59    the register should be converted to SSA.  */
  60
  61 #ifndef CONVERT_HARD_REGISTER_TO_SSA_P
  62 #define CONVERT_HARD_REGISTER_TO_SSA_P(REG_NO) (0) /* default of no hard registers */
  63 #endif /* CONVERT_HARD_REGISTER_TO_SSA_P  */
  64
  65 /* Given a register number REG_NO, return nonzero if and only if the
  66    register should be converted to SSA.  */
  67
  68 #define CONVERT_REGISTER_TO_SSA_P(REG_NO)       \
  69         ((!HARD_REGISTER_NUM_P (REG_NO)) || \
  70          (CONVERT_HARD_REGISTER_TO_SSA_P (REG_NO)))