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Improvements in array index code.

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git-svn-id: svn://svn.cc65.org/cc65/trunk@4001 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
uz 2009-08-14 17:28:32 +00:00
parent a9b2226956
commit f374e746af
1 changed files with 18 additions and 12 deletions
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30
src/cc65/coptptrload.c
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@ -61,19 +61,18 @@ unsigned OptPtrLoad1 (CodeSeg* S)
* adc yyy
* tax
* tya
* ldy
* ldy #$00
* jsr ldauidx
*
* and replace it by:
*
* clc
* adc xxx
* sta ptr1
* txa
* clc
* adc yyy
* sta ptr1+1
* ldy
* ldx #$00
* ldy xxx
* ldx #$00
* lda (ptr1),y
*/
{
@ -92,12 +91,16 @@ unsigned OptPtrLoad1 (CodeSeg* S)
if (L[0]->OPC == OP65_CLC &&
CS_GetEntries (S, L+1, I+1, 8) &&
L[1]->OPC == OP65_ADC &&
(L[1]->AM == AM65_ABS ||
L[1]->AM == AM65_ZP ||
L[1]->AM == AM65_IMM) &&
L[2]->OPC == OP65_TAY &&
L[3]->OPC == OP65_TXA &&
L[4]->OPC == OP65_ADC &&
L[5]->OPC == OP65_TAX &&
L[6]->OPC == OP65_TYA &&
L[7]->OPC == OP65_LDY &&
CE_IsKnownImm (L[7], 0) &&
CE_IsCallTo (L[8], "ldauidx") &&
!CS_RangeHasLabel (S, I+1, 8)) {
@ -105,7 +108,7 @@ unsigned OptPtrLoad1 (CodeSeg* S)
CodeEntry* P;
/* Track the insertion point */
unsigned IP = I+2;
unsigned IP = I;
/* sta ptr1 */
X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1", 0, L[2]->LI);
@ -116,14 +119,17 @@ unsigned OptPtrLoad1 (CodeSeg* S)
* transfer the value in X to A.
*/
if ((P = CS_GetPrevEntry (S, I)) != 0 &&
P->OPC == OP65_LDX &&
!CE_HasLabel (P)) {
X = NewCodeEntry (OP65_LDA, P->AM, P->Arg, 0, P->LI);
P->OPC == OP65_LDX &&
!CE_HasLabel (P)) {
X = NewCodeEntry (OP65_LDA, P->AM, P->Arg, 0, P->LI);
} else {
X = NewCodeEntry (OP65_TXA, AM65_IMP, 0, 0, L[3]->LI);
}
CS_InsertEntry (S, X, IP++);
/* clc is now in the right place */
++IP;
/* adc yyy */
X = NewCodeEntry (OP65_ADC, L[4]->AM, L[4]->Arg, 0, L[4]->LI);
CS_InsertEntry (S, X, IP++);
@ -132,8 +138,8 @@ unsigned OptPtrLoad1 (CodeSeg* S)
X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1+1", 0, L[5]->LI);
CS_InsertEntry (S, X, IP++);
/* ldy ... */
X = NewCodeEntry (OP65_LDY, L[7]->AM, L[7]->Arg, 0, L[7]->LI);
/* ldy xxx */
X = NewCodeEntry (OP65_LDY, L[1]->AM, L[1]->Arg, 0, L[1]->LI);
CS_InsertEntry (S, X, IP++);
/* ldx #$00 */
@ -145,7 +151,7 @@ unsigned OptPtrLoad1 (CodeSeg* S)
CS_InsertEntry (S, X, IP++);
/* Remove the old instructions */
CS_DelEntries (S, IP, 7);
CS_DelEntries (S, IP, 8);
/* Remember, we had changes */
++Changes;