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More optimizations
git-svn-id: svn://svn.cc65.org/cc65/trunk@839 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz
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24403e151e
commit
0529c2044a
@ -1839,6 +1839,198 @@ static unsigned OptPtrLoad1 (CodeSeg* S)
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static unsigned OptPtrLoad2 (CodeSeg* S)
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/* Search for the sequence:
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*
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* adc xxx
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* tay
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* txa
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* adc yyy
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* tax
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* tya
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* ldy
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* jsr ldauidx
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*
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* and replace it by:
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*
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* adc xxx
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* sta ptr1
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* txa
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* adc yyy
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* sta ptr1+1
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* ldy
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* ldx #$00
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* lda (ptr1),y
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*/
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{
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unsigned Changes = 0;
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/* Walk over the entries */
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unsigned I = 0;
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while (I < CS_GetEntryCount (S)) {
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CodeEntry* L[8];
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/* Get next entry */
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L[0] = CS_GetEntry (S, I);
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/* Check for the sequence */
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if (L[0]->OPC == OP65_ADC &&
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CS_GetEntries (S, L+1, I+1, 7) &&
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L[1]->OPC == OP65_TAY &&
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!CE_HasLabel (L[1]) &&
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L[2]->OPC == OP65_TXA &&
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!CE_HasLabel (L[2]) &&
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L[3]->OPC == OP65_ADC &&
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!CE_HasLabel (L[3]) &&
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L[4]->OPC == OP65_TAX &&
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!CE_HasLabel (L[4]) &&
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L[5]->OPC == OP65_TYA &&
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!CE_HasLabel (L[5]) &&
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L[6]->OPC == OP65_LDY &&
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!CE_HasLabel (L[6]) &&
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L[7]->OPC == OP65_JSR &&
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strcmp (L[7]->Arg, "ldauidx") == 0 &&
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!CE_HasLabel (L[7])) {
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CodeEntry* X;
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/* Store the low byte and remove the TAY instead */
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X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1", 0, L[0]->LI);
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CS_InsertEntry (S, X, I+1);
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CS_DelEntry (S, I+2);
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/* Store the high byte */
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X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1+1", 0, L[3]->LI);
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CS_InsertEntry (S, X, I+4);
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/* Delete more transfer insns */
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CS_DelEntry (S, I+6);
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CS_DelEntry (S, I+5);
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/* Delete the call to ldauidx */
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CS_DelEntry (S, I+6);
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/* Load high and low byte */
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X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[6]->LI);
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CS_InsertEntry (S, X, I+6);
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X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, "ptr1", 0, L[6]->LI);
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CS_InsertEntry (S, X, I+7);
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/* Remember, we had changes */
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++Changes;
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}
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/* Next entry */
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++I;
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}
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/* Return the number of changes made */
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return Changes;
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}
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static unsigned OptPtrLoad3 (CodeSeg* S)
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/* Search for the sequence:
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*
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* adc xxx
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* pha
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* txa
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* iny
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* adc yyy
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* tax
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* pla
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* ldy
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* jsr ldauidx
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*
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* and replace it by:
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*
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* adc xxx
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* sta ptr1
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* txa
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* iny
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* adc yyy
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* sta ptr1+1
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* ldy
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* ldx #$00
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* lda (ptr1),y
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*/
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{
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unsigned Changes = 0;
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/* Walk over the entries */
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unsigned I = 0;
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while (I < CS_GetEntryCount (S)) {
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CodeEntry* L[9];
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/* Get next entry */
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L[0] = CS_GetEntry (S, I);
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/* Check for the sequence */
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if (L[0]->OPC == OP65_ADC &&
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CS_GetEntries (S, L+1, I+1, 8) &&
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L[1]->OPC == OP65_PHA &&
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!CE_HasLabel (L[1]) &&
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L[2]->OPC == OP65_TXA &&
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!CE_HasLabel (L[2]) &&
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L[3]->OPC == OP65_INY &&
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!CE_HasLabel (L[3]) &&
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L[4]->OPC == OP65_ADC &&
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!CE_HasLabel (L[4]) &&
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L[5]->OPC == OP65_TAX &&
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!CE_HasLabel (L[5]) &&
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L[6]->OPC == OP65_PLA &&
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!CE_HasLabel (L[6]) &&
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L[7]->OPC == OP65_LDY &&
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!CE_HasLabel (L[7]) &&
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L[8]->OPC == OP65_JSR &&
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strcmp (L[8]->Arg, "ldauidx") == 0 &&
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!CE_HasLabel (L[8])) {
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CodeEntry* X;
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/* Store the low byte and remove the PHA instead */
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X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1", 0, L[0]->LI);
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CS_InsertEntry (S, X, I+1);
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CS_DelEntry (S, I+2);
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/* Store the high byte */
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X = NewCodeEntry (OP65_STA, AM65_ZP, "ptr1+1", 0, L[4]->LI);
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CS_InsertEntry (S, X, I+5);
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/* Delete more transfer and PLA insns */
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CS_DelEntry (S, I+7);
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CS_DelEntry (S, I+6);
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/* Delete the call to ldauidx */
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CS_DelEntry (S, I+7);
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/* Load high and low byte */
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X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[6]->LI);
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CS_InsertEntry (S, X, I+7);
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X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, "ptr1", 0, L[6]->LI);
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CS_InsertEntry (S, X, I+8);
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/* Remember, we had changes */
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++Changes;
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}
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/* Next entry */
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++I;
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}
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/* Return the number of changes made */
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return Changes;
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}
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static unsigned OptPtrLoad4 (CodeSeg* S)
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/* Search for the sequence
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*
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* ldy ...
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@ -1941,8 +2133,10 @@ static OptFunc OptFuncs [] = {
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OptEntry (OptPtrStore1, optPre),
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OptEntry (OptPtrStore2, optPre),
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/* Optimize loads through pointers */
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OptEntry (OptPtrLoad1, optMain),
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OptEntry (OptPtrLoad2, optMain),
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OptEntry (OptPtrLoad1, optPre),
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OptEntry (OptPtrLoad2, optPre),
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OptEntry (OptPtrLoad3, optPre),
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OptEntry (OptPtrLoad4, optMain),
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/* Optimize calls to nega */
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OptEntry (OptNegA1, optMain),
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OptEntry (OptNegA2, optMain),
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