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Remove transfer insns if possible

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git-svn-id: svn://svn.cc65.org/cc65/trunk@795 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2001-07-16 18:48:04 +00:00
parent 6a09064842
commit 2266d11fec
1 changed files with 33 additions and 8 deletions
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39
src/cc65/coptind.c
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@ -681,6 +681,7 @@ unsigned OptDuplicateLoads (CodeSeg* S)
while (I < CS_GetEntryCount (S)) {
unsigned char Use, Chg;
CodeEntry* N;
/* Get next entry */
CodeEntry* E = CS_GetEntry (S, I);
@ -858,7 +859,7 @@ unsigned OptDuplicateLoads (CodeSeg* S)
case OP65_LDA:
if (IsKnownImm (E)) {
CodeEntry* N = CS_GetNextEntry (S, I);
N = CS_GetNextEntry (S, I);
if (RegA >= 0 && RegA == E->Num && N && (N->Info & OF_FBRA) == 0) {
Delete = 1;
} else {
@ -872,7 +873,7 @@ unsigned OptDuplicateLoads (CodeSeg* S)
case OP65_LDX:
if (IsKnownImm (E)) {
CodeEntry* N = CS_GetNextEntry (S, I);
N = CS_GetNextEntry (S, I);
if (RegX >= 0 && RegX == E->Num && N && (N->Info & OF_FBRA) == 0) {
Delete = 1;
} else {
@ -886,7 +887,7 @@ unsigned OptDuplicateLoads (CodeSeg* S)
case OP65_LDY:
if (IsKnownImm (E)) {
CodeEntry* N = CS_GetNextEntry (S, I);
N = CS_GetNextEntry (S, I);
if (RegY >= 0 && RegY == E->Num && N && (N->Info & OF_FBRA) == 0) {
Delete = 1;
} else {
@ -1001,11 +1002,23 @@ unsigned OptDuplicateLoads (CodeSeg* S)
break;
case OP65_TAX:
RegX = RegA;
N = CS_GetNextEntry (S, I);
if (RegA >= 0 && RegA == RegX && N && (N->Info & OF_FBRA) == 0) {
/* Value is identical and not followed by a branch */
Delete = 1;
} else {
RegX = RegA;
}
break;
case OP65_TAY:
RegY = RegA;
N = CS_GetNextEntry (S, I);
if (RegA >= 0 && RegA == RegY && N && (N->Info & OF_FBRA) == 0) {
/* Value is identical and not followed by a branch */
Delete = 1;
} else {
RegY = RegA;
}
break;
case OP65_TRB:
@ -1019,14 +1032,26 @@ unsigned OptDuplicateLoads (CodeSeg* S)
break;
case OP65_TXA:
RegA = RegX;
N = CS_GetNextEntry (S, I);
if (RegX >= 0 && RegX == RegA && N && (N->Info & OF_FBRA) == 0) {
/* Value is identical and not followed by a branch */
Delete = 1;
} else {
RegA = RegX;
}
break;
case OP65_TXS:
break;
case OP65_TYA:
RegA = RegY;
N = CS_GetNextEntry (S, I);
if (RegY >= 0 && RegY == RegA && N && (N->Info & OF_FBRA) == 0) {
/* Value is identical and not followed by a branch */
Delete = 1;
} else {
RegA = RegY;
}
break;
default: