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Initialize LiveRegs once in BranchFolder::mergeCommonTails

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llvm-svn: 335365
This commit is contained in:
Krzysztof Parzyszek 2018-06-22 16:38:38 +00:00
parent dab1220353
commit 9d1f43196a
1 changed files with 2 additions and 1 deletions
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3
lib/CodeGen/BranchFolding.cpp
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@ -921,11 +921,12 @@ void BranchFolder::mergeCommonTails(unsigned commonTailIndex) {
if (UpdateLiveIns) {
LivePhysRegs NewLiveIns(*TRI);
computeLiveIns(NewLiveIns, *MBB);
LiveRegs.init(*TRI);
// The flag merging may lead to some register uses no longer using the
// <undef> flag, add IMPLICIT_DEFs in the predecessors as necessary.
for (MachineBasicBlock *Pred : MBB->predecessors()) {
LiveRegs.init(*TRI);
LiveRegs.clear();
LiveRegs.addLiveOuts(*Pred);
MachineBasicBlock::iterator InsertBefore = Pred->getFirstTerminator();
for (unsigned Reg : NewLiveIns) {