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Optimize decaxn

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git-svn-id: svn://svn.cc65.org/cc65/trunk@3726 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2006-04-15 19:28:45 +00:00
parent 06e00f9343
commit d82d94ecc1
3 changed files with 72 additions and 9 deletions
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5
src/cc65/codeopt.c
View File

@ -6,7 +6,7 @@
/* */
/* */
/* */
/* (C) 2001-2003 Ullrich von Bassewitz */
/* (C) 2001-2006 Ullrich von Bassewitz */
/* Römerstraße 52 */
/* D-70794 Filderstadt */
/* EMail: uz@cc65.org */
@ -1868,6 +1868,7 @@ static OptFunc DOptStore4 = { OptStore4, "OptStore4", 50, 0,
static OptFunc DOptStoreLoad = { OptStoreLoad, "OptStoreLoad", 0, 0, 0, 0, 0, 0 };
static OptFunc DOptSub1 = { OptSub1, "OptSub1", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptSub2 = { OptSub2, "OptSub2", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptSub3 = { OptSub3, "OptSub3", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptTest1 = { OptTest1, "OptTest1", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptTransfers1 = { OptTransfers1, "OptTransfers1", 0, 0, 0, 0, 0, 0 };
static OptFunc DOptTransfers2 = { OptTransfers2, "OptTransfers2", 60, 0, 0, 0, 0, 0 };
@ -1941,6 +1942,7 @@ static OptFunc* OptFuncs[] = {
&DOptStoreLoad,
&DOptSub1,
&DOptSub2,
&DOptSub3,
&DOptTest1,
&DOptTransfers1,
&DOptTransfers2,
@ -2245,6 +2247,7 @@ static unsigned RunOptGroup3 (CodeSeg* S)
C += RunOptFunc (S, &DOptNegA2, 1);
C += RunOptFunc (S, &DOptSub1, 1);
C += RunOptFunc (S, &DOptSub2, 1);
C += RunOptFunc (S, &DOptSub3, 1);
C += RunOptFunc (S, &DOptAdd5, 1);
C += RunOptFunc (S, &DOptAdd6, 1);
C += RunOptFunc (S, &DOptStackOps, 1);

63
src/cc65/coptsub.c
View File

@ -6,10 +6,10 @@
/* */
/* */
/* */
/* (C) 2001 Ullrich von Bassewitz */
/* Wacholderweg 14 */
/* D-70597 Stuttgart */
/* EMail: uz@cc65.org */
/* (C) 2001-2006, Ullrich von Bassewitz */
/* Römerstrasse 52 */
/* D-70794 Filderstadt */
/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
@ -33,6 +33,9 @@
/* common */
#include "chartype.h"
/* cc65 */
#include "codeent.h"
#include "codeinfo.h"
@ -175,4 +178,56 @@ unsigned OptSub2 (CodeSeg* S)
unsigned OptSub3 (CodeSeg* S)
/* Search for a call to decaxn and replace it by an 8 bit sub if the X register
* is not used later.
*/
{
unsigned Changes = 0;
/* Walk over the entries */
unsigned I = 0;
while (I < CS_GetEntryCount (S)) {
CodeEntry* E;
/* Get next entry */
E = CS_GetEntry (S, I);
/* Check for the sequence */
if (E->OPC == OP65_JSR &&
strncmp (E->Arg, "decax", 5) == 0 &&
IsDigit (E->Arg[5]) &&
E->Arg[6] == '\0' &&
!RegXUsed (S, I+1)) {
CodeEntry* X;
const char* Arg;
/* Insert new code behind the sequence */
X = NewCodeEntry (OP65_SEC, AM65_IMP, 0, 0, E->LI);
CS_InsertEntry (S, X, I+1);
Arg = MakeHexArg (E->Arg[5] - '0');
X = NewCodeEntry (OP65_SBC, AM65_IMM, Arg, 0, E->LI);
CS_InsertEntry (S, X, I+2);
/* Delete the old code */
CS_DelEntry (S, I);
/* Remember, we had changes */
++Changes;
}
/* Next entry */
++I;
}
/* Return the number of changes made */
return Changes;
}

13
src/cc65/coptsub.h
View File

@ -6,10 +6,10 @@
/* */
/* */
/* */
/* (C) 2001 Ullrich von Bassewitz */
/* Wacholderweg 14 */
/* D-70597 Stuttgart */
/* EMail: uz@cc65.org */
/* (C) 2001-2006, Ullrich von Bassewitz */
/* Römerstrasse 52 */
/* D-70794 Filderstadt */
/* EMail: uz@cc65.org */
/* */
/* */
/* This software is provided 'as-is', without any expressed or implied */
@ -78,6 +78,11 @@ unsigned OptSub2 (CodeSeg* S);
* sta yy
*/
unsigned OptSub3 (CodeSeg* S);
/* Search for a call to decaxn and replace it by an 8 bit sub if the X register
* is not used later.
*/
/* End of coptsub.h */