sdcc/src/SDCCcse.h

   1 /*-------------------------------------------------------------------------
   2
   3   SDCCcse.h - header file for Common Subexpressions
   4
   5              Written By -  Sandeep Dutta . sandeep.dutta@usa.net (1998)
   6
   7    This program is free software; you can redistribute it and/or modify it
   8    under the terms of the GNU General Public License as published by the
   9    Free Software Foundation; either version 2, or (at your option) any
  10    later version.
  11
  12    This program 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 this program; if not, write to the Free Software
  19    Foundation, 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
  20
  21    In other words, you are welcome to use, share and improve this program.
  22    You are forbidden to forbid anyone else to use, share and improve
  23    what you give them.   Help stamp out software-hoarding!
  24 -------------------------------------------------------------------------*/
  25
  26 #include "SDCCicode.h"
  27
  28 #ifndef SDCCCSE_H
  29 #define SDCCCSE_H 1
  30
  31 typedef struct cseDef
  32   {
  33
  34     int key;
  35     operand *sym;             /* defining symbol */
  36     iCode *diCode;            /* defining instruction */
  37     bitVect *ancestors;       /* keys of the symbol's ancestors */
  38     int fromGlobal;           /* defining symbol's value computed from a global */
  39     unsigned fromAddrTaken:1; /* defining symbol's value computed from a */
  40                               /*   symbol whose address was taken */
  41     unsigned nonLocalCSE:1;   /* CSE def visible outside of originating */
  42                               /*   basic block */
  43   }
  44 cseDef;
  45
  46
  47 cseDef *newCseDef (operand *, iCode *);
  48 int isCseDefEqual (void *, void *);
  49 int pcseDef (void *, va_list);
  50 DEFSETFUNC (ifDiCodeIsX);
  51 int ifDiCodeIs (set *, iCode *);
  52 DEFSETFUNC (ifDefSymIsX);
  53 int ifDefSymIs (set *, operand *);
  54 DEFSETFUNC (findPrevIc);
  55 DEFSETFUNC (ifOperandsHave);
  56 DEFSETFUNC (findCheaperOp);
  57 int cseBBlock (eBBlock *, int computeOnly, ebbIndex *);
  58 int cseAllBlocks (ebbIndex *, int computeOnly);
  59 void unsetDefsAndUses (iCode *);
  60 void updateSpillLocation (iCode * ic,int);
  61 void setUsesDefs (operand *, bitVect *, bitVect *, bitVect **);
  62 void replaceAllSymBySym (iCode *, operand *, operand *, bitVect **);
  63 iCode *findBackwardDef(operand *,iCode *);
  64 void ReplaceOpWithCheaperOp(operand **op, operand *cop);
  65 void freeCSEdata (eBBlock *);
  66
  67 #endif