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We don't need to update live intervals for dead PHIs.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@54369 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Owen Anderson 2008-08-05 20:51:26 +00:00
parent d3eda89f4c
commit e7b8205e6e
1 changed files with 34 additions and 31 deletions
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3
lib/CodeGen/StrongPHIElimination.cpp
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@ -884,6 +884,8 @@ bool StrongPHIElimination::runOnMachineFunction(MachineFunction &Fn) {
I != E; ) {
MachineInstr* PInstr = *(I++);
// Don't do live interval updating for dead PHIs.
if (!PInstr->registerDefIsDead(PInstr->getOperand(0).getReg())) {
// Trim live intervals of input registers. They are no longer live into
// this block.
for (unsigned i = 1; i < PInstr->getNumOperands(); i += 2) {
@ -917,6 +919,7 @@ bool StrongPHIElimination::runOnMachineFunction(MachineFunction &Fn) {
PLR->start, PLR->valno);
PI.addRange(R);
}
}
LI.RemoveMachineInstrFromMaps(PInstr);
PInstr->eraseFromParent();