A partial re-def instruction may be a copy.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103850 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index 78d4639..aa0597f 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -454,7 +454,14 @@
// Value#0 is now defined by the 2-addr instruction.
OldValNo->def = RedefIndex;
- OldValNo->setCopy(0);
+ if (!PartReDef)
+ OldValNo->setCopy(0);
+ else {
+ // A re-def may be a copy. e.g. %reg1030:6<def> = VMOVD %reg1026, ...
+ unsigned SrcReg, DstReg, SrcSubReg, DstSubReg;
+ if (tii_->isMoveInstr(*mi, SrcReg, DstReg, SrcSubReg, DstSubReg))
+ OldValNo->setCopy(&*mi);
+ }
// Add the new live interval which replaces the range for the input copy.
LiveRange LR(DefIndex, RedefIndex, ValNo);