Recompute hasPHIKill flags when shrinking live intervals.
PHI values may be deleted, causing the flags to be wrong. This fixes PR9616.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@129092 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index 07f83ea..c77ae1b 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -787,6 +787,8 @@
VNInfo *VNI = *I;
if (VNI->isUnused())
continue;
+ // We may eliminate PHI values, so recompute PHIKill flags.
+ VNI->setHasPHIKill(false);
NewLI.addRange(LiveRange(VNI->def, VNI->def.getNextSlot(), VNI));
// A use tied to an early-clobber def ends at the load slot and isn't caught
@@ -822,7 +824,7 @@
VNInfo *PVNI = li->getVNInfoAt(Stop);
// A predecessor is not required to have a live-out value for a PHI.
if (PVNI) {
- assert(PVNI->hasPHIKill() && "Missing hasPHIKill flag");
+ PVNI->setHasPHIKill(true);
WorkList.push_back(std::make_pair(Stop, PVNI));
}
}