Only worry about intervening kill if there are more than one live ranges in the interval.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@37052 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index a996aea..00c212d 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -1073,9 +1073,11 @@
// have clobbered values for this range.
if (MRegisterInfo::isPhysicalRegister(repDstReg)) {
// Unset unnecessary kills.
- for (LiveInterval::Ranges::const_iterator I = SrcInt.begin(),
- E = SrcInt.end(); I != E; ++I)
- unsetRegisterKills(I->start, I->end, repDstReg);
+ if (!DstInt.containsOneValue()) {
+ for (LiveInterval::Ranges::const_iterator I = SrcInt.begin(),
+ E = SrcInt.end(); I != E; ++I)
+ unsetRegisterKills(I->start, I->end, repDstReg);
+ }
// Update the liveintervals of sub-registers.
for (const unsigned *AS = mri_->getSubRegisters(repDstReg); *AS; ++AS)