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Optimization step that handles load from *ptr++ if ptr is a char* register
variable. git-svn-id: svn://svn.cc65.org/cc65/trunk@3309 b7a2c559-68d2-44c3-8de9-860c34a00d81
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cuz
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@ -1029,7 +1029,7 @@ static unsigned OptPtrLoad4 (CodeSeg* S)
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L[1]->OPC == OP65_LDX &&
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L[1]->AM == AM65_IMM &&
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!CE_HasLabel (L[1]) &&
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L[2]->OPC == OP65_LDY &&
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L[2]->OPC == OP65_LDY &&
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CE_KnownImm (L[2]) &&
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!CE_HasLabel (L[2]) &&
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L[3]->OPC == OP65_CLC &&
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@ -1059,7 +1059,7 @@ static unsigned OptPtrLoad4 (CodeSeg* S)
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CodeEntry* X;
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char* Label;
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/* Add the lda */
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/* Add the lda */
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X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, L[4]->Arg, 0, L[0]->LI);
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CS_InsertEntry (S, X, I+3);
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@ -1079,7 +1079,7 @@ static unsigned OptPtrLoad4 (CodeSeg* S)
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xfree (Label);
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/* Remove the old code */
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CS_DelEntries (S, I, 2);
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CS_DelEntries (S, I, 2);
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CS_DelEntries (S, I+5, 6);
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/* Remember, we had changes */
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@ -1099,6 +1099,152 @@ static unsigned OptPtrLoad4 (CodeSeg* S)
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static unsigned OptPtrLoad5 (CodeSeg* S)
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/* Search for the sequence:
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*
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* lda regbank+n
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* ldx regbank+n+1
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* sta regsave
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* stx regsave+1
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* clc
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* adc #$01
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* bcc L0005
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* inx
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* L: sta regbank+n
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* stx regbank+n+1
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* lda regsave
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* ldx regsave+1
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* ldy #$00
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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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* ldy #$00
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* ldx #$00
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* lda (regbank+n),y
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* inc regbank+n
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* bne L1
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* inc regbank+n+1
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* L1: tay <- only if flags are used
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*
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* This function must execute before OptPtrLoad5!
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*
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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[15];
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unsigned Len;
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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_LDA &&
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L[0]->AM == AM65_ZP &&
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strncmp (L[0]->Arg, "regbank+", 8) == 0 &&
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(Len = strlen (L[0]->Arg)) > 0 &&
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CS_GetEntries (S, L+1, I+1, 14) &&
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!CS_RangeHasLabel (S, I+1, 7) &&
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!CS_RangeHasLabel (S, I+9, 5) &&
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L[1]->OPC == OP65_LDX &&
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L[1]->AM == AM65_ZP &&
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strncmp (L[1]->Arg, L[0]->Arg, Len) == 0 &&
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strcmp (L[1]->Arg+Len, "+1") == 0 &&
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L[2]->OPC == OP65_STA &&
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L[2]->AM == AM65_ZP &&
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strcmp (L[2]->Arg, "regsave") == 0 &&
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L[3]->OPC == OP65_STX &&
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L[3]->AM == AM65_ZP &&
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strcmp (L[3]->Arg, "regsave+1") == 0 &&
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L[4]->OPC == OP65_CLC &&
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L[5]->OPC == OP65_ADC &&
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CE_KnownImm (L[5]) &&
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L[5]->Num == 1 &&
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L[6]->OPC == OP65_BCC &&
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L[6]->JumpTo != 0 &&
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L[6]->JumpTo->Owner == L[8] &&
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L[7]->OPC == OP65_INX &&
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L[8]->OPC == OP65_STA &&
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L[8]->AM == AM65_ZP &&
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strcmp (L[8]->Arg, L[0]->Arg) == 0 &&
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L[9]->OPC == OP65_STX &&
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L[9]->AM == AM65_ZP &&
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strcmp (L[9]->Arg, L[1]->Arg) == 0 &&
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L[10]->OPC == OP65_LDA &&
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L[10]->AM == AM65_ZP &&
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strcmp (L[10]->Arg, "regsave") == 0 &&
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L[11]->OPC == OP65_LDX &&
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L[11]->AM == AM65_ZP &&
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strcmp (L[11]->Arg, "regsave+1") == 0 &&
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L[12]->OPC == OP65_LDY &&
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CE_KnownImm (L[12]) &&
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CE_IsCallTo (L[13], "ldauidx")) {
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CodeEntry* X;
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CodeLabel* Label;
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/* Check if the instruction following the sequence uses the flags
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* set by the load. If so, insert a test of the value in the
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* accumulator.
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*/
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if (CE_UseLoadFlags (L[14])) {
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X = NewCodeEntry (OP65_TAY, AM65_IMP, 0, 0, L[13]->LI);
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CS_InsertEntry (S, X, I+14);
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}
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/* Attach a label to L[14]. This may be either the just inserted
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* instruction, or the one following the sequence.
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*/
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Label = CS_GenLabel (S, L[14]);
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/* ldy #$xx */
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X = NewCodeEntry (OP65_LDY, AM65_IMM, L[12]->Arg, 0, L[12]->LI);
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CS_InsertEntry (S, X, I+14);
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/* ldx #$xx */
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X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[13]->LI);
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CS_InsertEntry (S, X, I+15);
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/* lda (regbank+n),y */
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X = NewCodeEntry (OP65_LDA, AM65_ZP_INDY, L[0]->Arg, 0, L[13]->LI);
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CS_InsertEntry (S, X, I+16);
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/* inc regbank+n */
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X = NewCodeEntry (OP65_INC, AM65_ZP, L[0]->Arg, 0, L[5]->LI);
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CS_InsertEntry (S, X, I+17);
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/* bne ... */
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X = NewCodeEntry (OP65_BNE, AM65_BRA, Label->Name, Label, L[6]->LI);
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CS_InsertEntry (S, X, I+18);
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/* inc regbank+n+1 */
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X = NewCodeEntry (OP65_INC, AM65_ZP, L[1]->Arg, 0, L[7]->LI);
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CS_InsertEntry (S, X, I+19);
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/* Delete the old code */
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CS_DelEntries (S, I, 14);
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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 OptPtrLoad6 (CodeSeg* S)
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/* Search for the sequence:
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*
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* lda zp
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@ -1166,7 +1312,7 @@ static unsigned OptPtrLoad5 (CodeSeg* S)
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static unsigned OptPtrLoad6 (CodeSeg* S)
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static unsigned OptPtrLoad7 (CodeSeg* S)
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/* Search for the sequence:
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*
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* lda zp
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@ -1244,7 +1390,7 @@ static unsigned OptPtrLoad6 (CodeSeg* S)
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static unsigned OptPtrLoad7 (CodeSeg* S)
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static unsigned OptPtrLoad8 (CodeSeg* S)
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/* Search for the sequence
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*
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* ldy ...
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@ -1258,7 +1404,7 @@ static unsigned OptPtrLoad7 (CodeSeg* S)
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* ldx #$00
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* lda (ptr1),y
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*
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* This step must be execute *after* OptPtrLoad1!
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* This step must be executed *after* OptPtrLoad1!
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*/
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{
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unsigned Changes = 0;
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@ -1615,9 +1761,10 @@ static OptFunc DOptPtrLoad1 = { OptPtrLoad1, "OptPtrLoad1", 100, 0,
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static OptFunc DOptPtrLoad2 = { OptPtrLoad2, "OptPtrLoad2", 100, 0, 0, 0, 0, 0 };
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static OptFunc DOptPtrLoad3 = { OptPtrLoad3, "OptPtrLoad3", 100, 0, 0, 0, 0, 0 };
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static OptFunc DOptPtrLoad4 = { OptPtrLoad4, "OptPtrLoad4", 100, 0, 0, 0, 0, 0 };
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static OptFunc DOptPtrLoad5 = { OptPtrLoad5, "OptPtrLoad5", 65, 0, 0, 0, 0, 0 };
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static OptFunc DOptPtrLoad6 = { OptPtrLoad6, "OptPtrLoad6", 86, 0, 0, 0, 0, 0 };
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static OptFunc DOptPtrLoad7 = { OptPtrLoad7, "OptPtrLoad7", 100, 0, 0, 0, 0, 0 };
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static OptFunc DOptPtrLoad5 = { OptPtrLoad5, "OptPtrLoad5", 50, 0, 0, 0, 0, 0 };
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static OptFunc DOptPtrLoad6 = { OptPtrLoad6, "OptPtrLoad6", 65, 0, 0, 0, 0, 0 };
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static OptFunc DOptPtrLoad7 = { OptPtrLoad7, "OptPtrLoad7", 86, 0, 0, 0, 0, 0 };
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static OptFunc DOptPtrLoad8 = { OptPtrLoad8, "OptPtrLoad8", 100, 0, 0, 0, 0, 0 };
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static OptFunc DOptPtrStore1 = { OptPtrStore1, "OptPtrStore1", 100, 0, 0, 0, 0, 0 };
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static OptFunc DOptPtrStore2 = { OptPtrStore2, "OptPtrStore2", 40, 0, 0, 0, 0, 0 };
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static OptFunc DOptPush1 = { OptPush1, "OptPush1", 65, 0, 0, 0, 0, 0 };
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@ -1684,6 +1831,7 @@ static OptFunc* OptFuncs[] = {
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&DOptPtrLoad5,
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&DOptPtrLoad6,
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&DOptPtrLoad7,
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&DOptPtrLoad8,
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&DOptPtrStore1,
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&DOptPtrStore2,
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&DOptPush1,
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@ -1951,6 +2099,7 @@ static unsigned RunOptGroup1 (CodeSeg* S)
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Changes += RunOptFunc (S, &DOptPtrLoad4, 1);
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Changes += RunOptFunc (S, &DOptPtrLoad5, 1);
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Changes += RunOptFunc (S, &DOptPtrLoad6, 1);
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Changes += RunOptFunc (S, &DOptPtrLoad7, 1);
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Changes += RunOptFunc (S, &DOptNegAX1, 1);
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Changes += RunOptFunc (S, &DOptNegAX2, 1);
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Changes += RunOptFunc (S, &DOptNegAX3, 1);
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@ -2001,7 +2150,7 @@ static unsigned RunOptGroup3 (CodeSeg* S)
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do {
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C = 0;
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C += RunOptFunc (S, &DOptPtrLoad7, 1);
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C += RunOptFunc (S, &DOptPtrLoad8, 1);
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C += RunOptFunc (S, &DOptNegA1, 1);
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C += RunOptFunc (S, &DOptNegA2, 1);
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C += RunOptFunc (S, &DOptSub1, 1);
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