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Extend an optimization

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git-svn-id: svn://svn.cc65.org/cc65/trunk@1061 b7a2c559-68d2-44c3-8de9-860c34a00d81
This commit is contained in:
cuz 2001-10-18 19:23:10 +00:00
parent 564fbbe448
commit 21c6e1badb
1 changed files with 6 additions and 5 deletions
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11
src/cc65/coptcmp.c
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@ -262,7 +262,7 @@ static int IsImmCmp16 (CodeEntry** L)
L[2]->OPC == OP65_CMP &&
L[2]->AM == AM65_IMM &&
(L[2]->Flags & CEF_NUMARG) != 0 &&
(L[3]->Info & OF_ZBRA) != 0 &&
(L[3]->Info & OF_CBRA) != 0 &&
L[3]->JumpTo != 0 &&
(L[1]->JumpTo->Owner == L[3] || L[1]->JumpTo == L[3]->JumpTo));
}
@ -536,7 +536,7 @@ unsigned OptCmp3 (CodeSeg* S)
* cpx #a
* bne L1
* cmp #b
* jne/jeq L2
* L1: jne/jeq L2
*
* If a is zero, we may remove the compare. If a and b are both zero, we may
* replace it by the sequence
@ -565,9 +565,10 @@ unsigned OptCmp3 (CodeSeg* S)
CS_GetEntries (S, L, I+1, 5) &&
L[0]->OPC == OP65_LDX &&
!CE_HasLabel (L[0]) &&
IsImmCmp16 (L+1)) {
IsImmCmp16 (L+1) &&
!RegAXUsed (S, I+6)) {
if (L[1]->Num == 0 && L[3]->Num == 0) {
if ((L[4]->Info & OF_FBRA) != 0 && L[1]->Num == 0 && L[3]->Num == 0) {
/* The value is zero, we may use the simple code version. */
CE_ReplaceOPC (L[0], OP65_ORA);
CS_DelEntries (S, I+2, 3);
@ -630,7 +631,7 @@ unsigned OptCmp4 (CodeSeg* S)
/* Check for the sequence */
if (IsLocalLoad16 (S, I, L, 9) && IsImmCmp16 (L+5)) {
if (L[5]->Num == 0 && L[7]->Num == 0) {
if ((L[8]->Info & OF_FBRA) != 0 && L[5]->Num == 0 && L[7]->Num == 0) {
/* The value is zero, we may use the simple code version:
* ldy #o