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More optimizations

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git-svn-id: svn://svn.cc65.org/cc65/trunk@840 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2001-08-05 22:09:48 +00:00
parent 0529c2044a
commit adb0ac070a
2 changed files with 132 additions and 9 deletions
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8
src/cc65/codegen.c
View File

@ -1713,12 +1713,8 @@ void g_addeqlocal (unsigned flags, int offs, unsigned long val)
if (flags & CF_CONST) {
g_getimmed (flags, val, 0);
}
if (offs == 0) {
AddCodeLine ("jsr addeq0sp");
} else {
ldyconst (offs);
AddCodeLine ("jsr addeqysp");
}
ldyconst (offs);
AddCodeLine ("jsr addeqysp");
break;
case CF_LONG:

133
src/cc65/codeopt.c
View File

@ -38,6 +38,7 @@
/* common */
#include "abend.h"
#include "print.h"
#include "xsprintf.h"
/* cc65 */
#include "asmlabel.h"
@ -632,6 +633,130 @@ static unsigned OptAdd1 (CodeSeg* S)
static unsigned OptAdd2 (CodeSeg* S)
/* Search for the sequence
*
* ldy #xx
* lda (sp),y
* tax
* dey
* lda (sp),y
* ldy #$yy
* jsr addeqysp
*
* and replace it by:
*
* ldy #xx-1
* lda (sp),y
* ldy #yy
* clc
* adc (sp),y
* sta (sp),y
* ldy #xx
* lda (sp),y
* ldy #yy+1
* adc (sp),y
* sta (sp),y
*
* provided that a/x is not used later.
*/
{
unsigned Changes = 0;
/* Walk over the entries */
unsigned I = 0;
while (I < CS_GetEntryCount (S)) {
CodeEntry* L[7];
/* Get next entry */
L[0] = CS_GetEntry (S, I);
/* Check for the sequence */
if (L[0]->OPC == OP65_LDY &&
CE_KnownImm (L[0]) &&
CS_GetEntries (S, L+1, I+1, 6) &&
L[1]->OPC == OP65_LDA &&
L[1]->AM == AM65_ZP_INDY &&
!CE_HasLabel (L[1]) &&
L[2]->OPC == OP65_TAX &&
!CE_HasLabel (L[2]) &&
L[3]->OPC == OP65_DEY &&
!CE_HasLabel (L[3]) &&
L[4]->OPC == OP65_LDA &&
L[4]->AM == AM65_ZP_INDY &&
!CE_HasLabel (L[4]) &&
L[5]->OPC == OP65_LDY &&
CE_KnownImm (L[5]) &&
!CE_HasLabel (L[5]) &&
L[6]->OPC == OP65_JSR &&
strcmp (L[6]->Arg, "addeqysp") == 0 &&
!CE_HasLabel (L[6])) {
char Buf [20];
CodeEntry* X;
int Offs;
/* Create a replacement for the first LDY */
Offs = (int) (L[0]->Num - 1);
xsprintf (Buf, sizeof (Buf), "$%02X", Offs);
X = NewCodeEntry (OP65_LDY, AM65_IMM, Buf, 0, L[0]->LI);
CS_InsertEntry (S, X, I+1);
CS_DelEntry (S, I);
/* Load Y with the low offset of the target variable */
X = NewCodeEntry (OP65_LDY, AM65_IMM, L[5]->Arg, 0, L[1]->LI);
CS_InsertEntry (S, X, I+2);
/* Add the CLC */
X = NewCodeEntry (OP65_CLC, AM65_IMP, 0, 0, L[1]->LI);
CS_InsertEntry (S, X, I+3);
/* Remove the TAX/DEY sequence */
CS_DelEntry (S, I+5); /* dey */
CS_DelEntry (S, I+4); /* tax */
/* Addition of the low byte */
X = NewCodeEntry (OP65_ADC, AM65_ZP_INDY, "sp", 0, L[4]->LI);
CS_InsertEntry (S, X, I+4);
X = NewCodeEntry (OP65_STA, AM65_ZP_INDY, "sp", 0, L[4]->LI);
CS_InsertEntry (S, X, I+5);
/* LDY */
xsprintf (Buf, sizeof (Buf), "$%02X", (Offs+1));
X = NewCodeEntry (OP65_LDY, AM65_IMM, Buf, 0, L[4]->LI);
CS_InsertEntry (S, X, I+6);
/* Addition of the high byte */
xsprintf (Buf, sizeof (Buf), "$%02X", (int)(L[5]->Num+1));
X = NewCodeEntry (OP65_LDY, AM65_IMM, Buf, 0, L[5]->LI);
CS_InsertEntry (S, X, I+8);
X = NewCodeEntry (OP65_ADC, AM65_ZP_INDY, "sp", 0, L[6]->LI);
CS_InsertEntry (S, X, I+9);
X = NewCodeEntry (OP65_STA, AM65_ZP_INDY, "sp", 0, L[6]->LI);
CS_InsertEntry (S, X, I+10);
/* Delete the remaining stuff */
CS_DelEntry (S, I+12);
CS_DelEntry (S, I+11);
/* Remember, we had changes */
++Changes;
}
/* Next entry */
++I;
}
/* Return the number of changes made */
return Changes;
}
static unsigned OptAdd3 (CodeSeg* S)
/* Search for the sequence
*
* adc ...
@ -1890,7 +2015,8 @@ static unsigned OptPtrLoad2 (CodeSeg* S)
!CE_HasLabel (L[6]) &&
L[7]->OPC == OP65_JSR &&
strcmp (L[7]->Arg, "ldauidx") == 0 &&
!CE_HasLabel (L[7])) {
!CE_HasLabel (L[7]) &&
(GetRegInfo (S, I+8) & REG_AX) == 0) {
CodeEntry* X;
@ -2001,7 +2127,7 @@ static unsigned OptPtrLoad3 (CodeSeg* S)
X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1+1", 0, L[4]->LI);
CS_InsertEntry (S, X, I+5);
/* Delete more transfer and PLA insns */
/* Delete more transfer and PLA insns */
CS_DelEntry (S, I+7);
CS_DelEntry (S, I+6);
@ -2150,7 +2276,8 @@ static OptFunc OptFuncs [] = {
OptEntry (OptSub2, optMain),
/* Optimize additions */
OptEntry (OptAdd1, optPre),
OptEntry (OptAdd2, optMain),
OptEntry (OptAdd2, optPre),
OptEntry (OptAdd3, optMain),
/* Optimize jump cascades */
OptEntry (OptJumpCascades, optMain),
/* Remove dead jumps */