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TwoAddressInstructionPass::tryInstructionTransform() only potentially returns

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true when shouldOnlyCommute is false, so we can remove code that checks
otherwise.

llvm-svn: 175980
This commit is contained in:
Cameron Zwarich 2013-02-24 00:27:29 +00:00
parent c4ffebf11a
commit 4c64670f2d
1 changed files with 4 additions and 5 deletions
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9
lib/CodeGen/TwoAddressInstructionPass.cpp
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@ -1218,10 +1218,11 @@ tryInstructionTransform(MachineBasicBlock::iterator &mi,
unsigned NewDstIdx = NewMIs[1]->findRegisterDefOperandIdx(regA);
unsigned NewSrcIdx = NewMIs[1]->findRegisterUseOperandIdx(regB);
MachineBasicBlock::iterator NewMI = NewMIs[1];
bool TransformSuccess =
bool TransformResult =
tryInstructionTransform(NewMI, mi, NewSrcIdx, NewDstIdx, Dist, true);
if (TransformSuccess ||
NewMIs[1]->getOperand(NewSrcIdx).isKill()) {
assert(!TransformResult &&
"tryInstructionTransform() should return false.");
if (NewMIs[1]->getOperand(NewSrcIdx).isKill()) {
// Success, or at least we made an improvement. Keep the unfolded
// instructions and discard the original.
if (LV) {
@ -1272,8 +1273,6 @@ tryInstructionTransform(MachineBasicBlock::iterator &mi,
}
mi = NewMIs[1];
if (TransformSuccess)
return true;
} else {
// Transforming didn't eliminate the tie and didn't lead to an
// improvement. Clean up the unfolded instructions and keep the