Fix PR8815 by checking for an explicit clobber def tied to a use operand in
ConnectedVNInfoEqClasses::Classify().
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122202 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveInterval.cpp b/lib/CodeGen/LiveInterval.cpp
index 3c18017..16551ab 100644
--- a/lib/CodeGen/LiveInterval.cpp
+++ b/lib/CodeGen/LiveInterval.cpp
@@ -769,6 +769,14 @@
// operand constraint?
if (const VNInfo *UVNI = LI->getVNInfoAt(VNI->def.getUseIndex()))
Connect(VNI->id, UVNI->id);
+
+ // Check for a tied operand constraint involving an early clobber def,
+ // where one VN ends right before the use index and the next VN is defined
+ // at the same use index.
+ if (VNI->def.isUse()) {
+ if (const VNInfo *PVNI = LI->getVNInfoAt(VNI->def.getLoadIndex()))
+ Connect(PVNI->id, VNI->id);
+ }
}
}