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More optimizations

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git-svn-id: svn://svn.cc65.org/cc65/trunk@1613 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2002-11-23 22:06:26 +00:00
parent 756091e31f
commit b948d96206
1 changed files with 72 additions and 83 deletions
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155
src/cc65/codeopt.c
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@ -615,85 +615,6 @@ static unsigned OptPtrStore2 (CodeSeg* S)
static unsigned OptPtrLoad1 (CodeSeg* S)
/* Search for the sequence:
*
* tax
* dey
* lda (sp),y # May be any destination
* ldy ...
* jsr ldauidx
*
* and replace it by:
*
* sta ptr1+1
* dey
* lda (sp),y
* sta ptr1
* ldy ...
* ldx #$00
* lda (ptr1),y
*/
{
unsigned Changes = 0;
/* Walk over the entries */
unsigned I = 0;
while (I < CS_GetEntryCount (S)) {
CodeEntry* L[5];
/* Get next entry */
L[0] = CS_GetEntry (S, I);
/* Check for the sequence */
if (L[0]->OPC == OP65_TAX &&
CS_GetEntries (S, L+1, I+1, 4) &&
L[1]->OPC == OP65_DEY &&
!CE_HasLabel (L[1]) &&
L[2]->OPC == OP65_LDA &&
!CE_HasLabel (L[2]) &&
L[3]->OPC == OP65_LDY &&
!CE_HasLabel (L[3]) &&
CE_IsCallTo (L[4], "ldauidx") &&
!CE_HasLabel (L[4])) {
CodeEntry* X;
/* Store the high byte and remove the TAX instead */
X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1+1", 0, L[0]->LI);
CS_InsertEntry (S, X, I+1);
CS_DelEntry (S, I);
/* Store the low byte */
X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1", 0, L[2]->LI);
CS_InsertEntry (S, X, I+3);
/* Delete the call to ldauidx */
CS_DelEntry (S, I+5);
/* Load high and low byte */
X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[3]->LI);
CS_InsertEntry (S, X, I+5);
X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, "ptr1", 0, L[3]->LI);
CS_InsertEntry (S, X, I+6);
/* Remember, we had changes */
++Changes;
}
/* Next entry */
++I;
}
/* Return the number of changes made */
return Changes;
}
static unsigned OptPtrLoad2 (CodeSeg* S)
/* Search for the sequence:
*
* clc
@ -803,7 +724,7 @@ static unsigned OptPtrLoad2 (CodeSeg* S)
static unsigned OptPtrLoad3 (CodeSeg* S)
static unsigned OptPtrLoad2 (CodeSeg* S)
/* Search for the sequence:
*
* adc xxx
@ -900,7 +821,7 @@ static unsigned OptPtrLoad3 (CodeSeg* S)
static unsigned OptPtrLoad4 (CodeSeg* S)
static unsigned OptPtrLoad3 (CodeSeg* S)
/* Search for the sequence:
*
* lda #<(label+0)
@ -999,7 +920,7 @@ static unsigned OptPtrLoad4 (CodeSeg* S)
static unsigned OptPtrLoad5 (CodeSeg* S)
static unsigned OptPtrLoad4 (CodeSeg* S)
/* Search for the sequence:
*
* lda #<(label+0)
@ -1109,6 +1030,74 @@ static unsigned OptPtrLoad5 (CodeSeg* S)
static unsigned OptPtrLoad5 (CodeSeg* S)
/* Search for the sequence:
*
* lda zp
* ldx zp+1
* ldy xx
* jsr ldauidx
*
* and replace it by:
*
* ldy xx
* ldx #$00
* lda (zp),y
*/
{
unsigned Changes = 0;
/* Walk over the entries */
unsigned I = 0;
while (I < CS_GetEntryCount (S)) {
CodeEntry* L[4];
unsigned Len;
/* Get next entry */
L[0] = CS_GetEntry (S, I);
/* Check for the sequence */
if (L[0]->OPC == OP65_LDA && L[0]->AM == AM65_ZP &&
CS_GetEntries (S, L+1, I+1, 3) &&
!CS_RangeHasLabel (S, I+1, 3) &&
L[1]->OPC == OP65_LDX && L[1]->AM == AM65_ZP &&
(Len = strlen (L[0]->Arg)) > 0 &&
strncmp (L[0]->Arg, L[1]->Arg, Len) == 0 &&
strcmp (L[1]->Arg + Len, "+1") == 0 &&
L[2]->OPC == OP65_LDY &&
CE_IsCallTo (L[3], "ldauidx")) {
CodeEntry* X;
/* ldx #$00 */
X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[3]->LI);
CS_InsertEntry (S, X, I+3);
/* lda (zp),y */
X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, L[0]->Arg, 0, L[3]->LI);
CS_InsertEntry (S, X, I+4);
/* Remove the old code */
CS_DelEntry (S, I+5);
CS_DelEntries (S, I, 2);
/* Remember, we had changes */
++Changes;
}
/* Next entry */
++I;
}
/* Return the number of changes made */
return Changes;
}
static unsigned OptPtrLoad6 (CodeSeg* S)
/* Search for the sequence
*
@ -1433,7 +1422,7 @@ static OptFunc DOptPtrLoad1 = { OptPtrLoad1, "OptPtrLoad1", 100, 0,
static OptFunc DOptPtrLoad2 = { OptPtrLoad2, "OptPtrLoad2", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrLoad3 = { OptPtrLoad3, "OptPtrLoad3", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrLoad4 = { OptPtrLoad4, "OptPtrLoad4", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrLoad5 = { OptPtrLoad5, "OptPtrLoad5", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrLoad5 = { OptPtrLoad5, "OptPtrLoad5", 65, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrLoad6 = { OptPtrLoad6, "OptPtrLoad6", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrStore1 = { OptPtrStore1, "OptPtrStore1", 100, 0, 0, 0, 0, 0 };
static OptFunc DOptPtrStore2 = { OptPtrStore2, "OptPtrStore2", 100, 0, 0, 0, 0, 0 };