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added optimization for indexed pointer load of a constant, e.g.: y = ((unsigned char*)0x100)[i]
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@ -814,6 +814,7 @@ static OptFunc DOptPtrLoad14 = { OptPtrLoad14, "OptPtrLoad14", 108, 0,
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static OptFunc DOptPtrLoad15 = { OptPtrLoad15, "OptPtrLoad15", 86, 0, 0, 0, 0, 0 };
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static OptFunc DOptPtrLoad16 = { OptPtrLoad16, "OptPtrLoad16", 100, 0, 0, 0, 0, 0 };
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static OptFunc DOptPtrLoad17 = { OptPtrLoad17, "OptPtrLoad17", 190, 0, 0, 0, 0, 0 };
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static OptFunc DOptPtrLoad18 = { OptPtrLoad18, "OptPtrLoad18", 100, 0, 0, 0, 0, 0 };
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static OptFunc DOptPtrStore1 = { OptPtrStore1, "OptPtrStore1", 65, 0, 0, 0, 0, 0 };
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static OptFunc DOptPtrStore2 = { OptPtrStore2, "OptPtrStore2", 65, 0, 0, 0, 0, 0 };
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static OptFunc DOptPtrStore3 = { OptPtrStore3, "OptPtrStore3", 100, 0, 0, 0, 0, 0 };
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@ -905,6 +906,7 @@ static OptFunc* OptFuncs[] = {
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&DOptPtrLoad15,
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&DOptPtrLoad16,
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&DOptPtrLoad17,
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&DOptPtrLoad18,
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&DOptPtrLoad2,
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&DOptPtrLoad3,
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&DOptPtrLoad4,
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@ -1246,6 +1248,7 @@ static unsigned RunOptGroup1 (CodeSeg* S)
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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, &DOptPtrLoad18, 1); /* Before OptPtrLoad11 */
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Changes += RunOptFunc (S, &DOptPtrLoad11, 1);
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Changes += RunOptFunc (S, &DOptPtrLoad12, 1);
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Changes += RunOptFunc (S, &DOptPtrLoad13, 1);
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@ -1457,3 +1457,100 @@ unsigned OptPtrLoad17 (CodeSeg* S)
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/* Return the number of changes made */
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return Changes;
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}
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unsigned OptPtrLoad18 (CodeSeg* S)
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/* Search for the sequence:
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**
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** ldx #$xx
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** lda #$yy
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** clc
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** adc xxx
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** bcc L
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** inx
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** L: 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 xxx
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** ldx #$00
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** lda $xxyy,y
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**
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** This is similar to OptPtrLoad3 but works on a constant address
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** instead of a label. Also, the initial X and A loads are reversed.
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** Must be run before OptPtrLoad11.
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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_LDX &&
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L[0]->AM == AM65_IMM &&
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CS_GetEntries (S, L+1, I+1, 7) &&
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L[1]->OPC == OP65_LDA &&
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L[1]->AM == AM65_IMM &&
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L[2]->OPC == OP65_CLC &&
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L[3]->OPC == OP65_ADC &&
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(L[3]->AM == AM65_ABS || L[3]->AM == AM65_ZP) &&
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(L[4]->OPC == OP65_BCC || L[4]->OPC == OP65_JCC) &&
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L[4]->JumpTo != 0 &&
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L[4]->JumpTo->Owner == L[6] &&
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L[5]->OPC == OP65_INX &&
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L[6]->OPC == OP65_LDY &&
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CE_IsKnownImm (L[6], 0) &&
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CE_IsCallTo (L[7], "ldauidx") &&
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!CS_RangeHasLabel (S, I+1, 5) &&
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!CE_HasLabel (L[7]) &&
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strlen (L[0]->Arg) == 3 &&
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L[0]->Arg[0] == '$' &&
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strlen (L[1]->Arg) == 3 &&
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L[1]->Arg[0] == '$' ) {
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CodeEntry* X;
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char* Label;
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/* We will create all the new stuff behind the current one so
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** we keep the line references.
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*/
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X = NewCodeEntry (OP65_LDY, L[3]->AM, L[3]->Arg, 0, L[0]->LI);
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CS_InsertEntry (S, X, I+8);
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X = NewCodeEntry (OP65_LDX, AM65_IMM, "$00", 0, L[0]->LI);
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CS_InsertEntry (S, X, I+9);
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Label = xmalloc(6);
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sprintf(Label, "$%s%s", L[0]->Arg+1, L[1]->Arg+1);
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X = NewCodeEntry (OP65_LDA, AM65_ABSY, Label, 0, L[0]->LI);
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CS_InsertEntry (S, X, I+10);
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xfree (Label);
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/* Remove the old code */
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CS_DelEntries (S, 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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@ -356,6 +356,27 @@ unsigned OptPtrLoad17 (CodeSeg* S);
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** the step with less than 200% so it gets executed when -Oi is in effect.
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*/
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unsigned OptPtrLoad18 (CodeSeg* S);
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/* Search for the sequence:
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**
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** ldx #$xx
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** lda #$yy
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** clc
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** adc xxx
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** bcc L
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** inx
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** L: 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 xxx
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** ldx #$00
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** lda $xxyy,y
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**
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** This is similar to OptPtrLoad3 but works on a constant address
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** instead of a label. Also, the initial X and A loads are reversed.
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*/
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/* End of coptptrload.h */
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