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fixed optimization bug where array index is 16-bit, e.g. arr16[i & 0x7f7f]

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Steven Hugg 2019-03-15 15:10:58 -04:00 • committed by greg-king5
parent dca99d59e5
commit a71f764c33
2 changed files with 43 additions and 35 deletions
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76
src/cc65/coptptrload.c
View file

@ -1557,6 +1557,7 @@ unsigned OptPtrLoad18 (CodeSeg* S)
unsigned OptPtrLoad19 (CodeSeg* S)
/* Search for the sequence:
**
** ldx #0
** and #mask (any value < 128)
** jsr aslax1/shlax1
** clc
@ -1571,6 +1572,7 @@ unsigned OptPtrLoad19 (CodeSeg* S)
**
** and replace it by:
**
** ldx #0
** and #mask (remove if == 127)
** asl
** tay
@ -1585,71 +1587,75 @@ unsigned OptPtrLoad19 (CodeSeg* S)
I = 0;
while (I < CS_GetEntryCount (S)) {
CodeEntry* L[11];
CodeEntry* L[12];
/* Get next entry */
L[0] = CS_GetEntry (S, I);
/* Check for the sequence */
if (L[0]->OPC == OP65_AND &&
L[0]->AM == AM65_IMM &&
CE_HasNumArg (L[0]) && L[0]->Num <= 127 &&
CS_GetEntries (S, L+1, I+1, 10) &&
L[1]->OPC == OP65_JSR &&
(strcmp (L[1]->Arg, "aslax1") == 0 ||
strcmp (L[1]->Arg, "shlax1") == 0) &&
L[2]->OPC == OP65_CLC &&
L[3]->OPC == OP65_ADC &&
L[4]->OPC == OP65_TAY &&
L[5]->OPC == OP65_TXA &&
L[6]->OPC == OP65_ADC &&
L[7]->OPC == OP65_TAX &&
L[8]->OPC == OP65_TYA &&
L[9]->OPC == OP65_LDY &&
CE_IsKnownImm(L[9], 1) &&
strlen(L[3]->Arg) >= 3 &&
L[3]->Arg[0] == '<' &&
strlen(L[6]->Arg) >= 3 &&
L[6]->Arg[0] == '>' &&
!strcmp(L[3]->Arg+1, L[6]->Arg+1) &&
CE_IsCallTo (L[10], "ldaxidx") &&
!CS_RangeHasLabel (S, I+1, 10)) {
if (L[0]->OPC == OP65_LDX &&
CE_IsKnownImm(L[0], 0) &&
CS_GetEntries (S, L+1, I+1, 11) &&
L[1]->OPC == OP65_AND &&
L[1]->AM == AM65_IMM &&
CE_HasNumArg (L[1]) && L[1]->Num <= 127 &&
L[2]->OPC == OP65_JSR &&
(strcmp (L[2]->Arg, "aslax1") == 0 ||
strcmp (L[2]->Arg, "shlax1") == 0) &&
L[3]->OPC == OP65_CLC &&
L[4]->OPC == OP65_ADC &&
L[5]->OPC == OP65_TAY &&
L[6]->OPC == OP65_TXA &&
L[7]->OPC == OP65_ADC &&
L[8]->OPC == OP65_TAX &&
L[9]->OPC == OP65_TYA &&
L[10]->OPC == OP65_LDY &&
CE_IsKnownImm(L[10], 1) &&
strlen(L[4]->Arg) >= 3 &&
L[4]->Arg[0] == '<' &&
strlen(L[7]->Arg) >= 3 &&
L[7]->Arg[0] == '>' &&
!strcmp(L[4]->Arg+1, L[7]->Arg+1) &&
CE_IsCallTo (L[11], "ldaxidx") &&
!CS_RangeHasLabel (S, I+1, 11)) {
CodeEntry* X;
char* Label;
int Len = strlen(L[3]->Arg);
int Len = strlen(L[4]->Arg);
/* Track the insertion point */
unsigned IP = I + 11;
unsigned IP = I + 12;
/* asl a */
X = NewCodeEntry (OP65_ASL, AM65_ACC, "a", 0, L[1]->LI);
X = NewCodeEntry (OP65_ASL, AM65_ACC, "a", 0, L[2]->LI);
CS_InsertEntry (S, X, IP++);
/* tay */
X = NewCodeEntry (OP65_TAY, AM65_IMP, 0, 0, L[1]->LI);
X = NewCodeEntry (OP65_TAY, AM65_IMP, 0, 0, L[2]->LI);
CS_InsertEntry (S, X, IP++);
/* lda label,y */
Label = memcpy (xmalloc (Len-2), L[3]->Arg+2, Len-3);
Label = memcpy (xmalloc (Len-2), L[4]->Arg+2, Len-3);
Label[Len-3] = '\0';
X = NewCodeEntry (OP65_LDA, AM65_ABSY, Label, 0, L[9]->LI);
X = NewCodeEntry (OP65_LDA, AM65_ABSY, Label, 0, L[10]->LI);
CS_InsertEntry (S, X, IP++);
xfree (Label);
/* lda label+1,y */
Label = memcpy (xmalloc (Len), L[3]->Arg+2, Len-3);
Label = memcpy (xmalloc (Len), L[4]->Arg+2, Len-3);
strcpy(&Label[Len-3], "+1");
X = NewCodeEntry (OP65_LDX, AM65_ABSY, Label, 0, L[9]->LI);
X = NewCodeEntry (OP65_LDX, AM65_ABSY, Label, 0, L[10]->LI);
CS_InsertEntry (S, X, IP++);
xfree (Label);
/* Remove the old code */
/* Remove the AND only if it's == 127, since ASL erases high bit */
if (L[0]->Num == 127)
CS_DelEntries (S, I, 11);
if (L[1]->Num == 127)
CS_DelEntries (S, I+1, 11);
else
CS_DelEntries (S, I+1, 10);
CS_DelEntries (S, I+2, 10);
/* Remove the ldx #0 */
CS_DelEntry(S, I);
/* Remember, we had changes */
++Changes;

2
src/cc65/coptptrload.h
View file

@ -382,6 +382,7 @@ unsigned OptPtrLoad18 (CodeSeg* S);
unsigned OptPtrLoad19 (CodeSeg* S);
/* Search for the sequence:
**
** ldx #0
** and #mask (any value < 128)
** jsr aslax1/shlax1
** clc
@ -396,6 +397,7 @@ unsigned OptPtrLoad19 (CodeSeg* S);
**
** and replace it by:
**
** ldx #0
** and #mask (remove if == 127)
** asl
** tay