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RegAlloc: Fix verifier error with undef identity copies

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The code did not match the example in the comment, and was checking
the undef flag on the copy dest instead of source. The existing tests
were only hitting the > 2 operands case.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@361156 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matt Arsenault
2019-05-20 14:09:36 +00:00
parent 26f54132c9
commit e3747985b5
2 changed files with 70 additions and 1 deletions
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lib/CodeGen/VirtRegMap.cpp
+1 -1
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@@ -384,7 +384,7 @@ void VirtRegRewriter::handleIdentityCopy(MachineInstr &MI) const {
// give us additional liveness information: The target (super-)register
// must not be valid before this point. Replace the COPY with a KILL
// instruction to maintain this information.
if (MI.getOperand(0).isUndef() || MI.getNumOperands() > 2) {
if (MI.getOperand(1).isUndef() || MI.getNumOperands() > 2) {
MI.setDesc(TII->get(TargetOpcode::KILL));
LLVM_DEBUG(dbgs() << " replace by: " << MI);
return;