Invalidate last use of a reused register if the use is a deleted noop copy.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@34839 91177308-0d34-0410-b5e6-96231b3b80d8

diff --git a/lib/CodeGen/VirtRegMap.cpp b/lib/CodeGen/VirtRegMap.cpp
index 0f5c48aaa9b84bdff09445c403015055ffaed055..7b8606c32093152db3aef2efab8b3f42a2f146e1 100644 (file)
--- a/lib/CodeGen/VirtRegMap.cpp
+++ b/lib/CodeGen/VirtRegMap.cpp
@@ -937,6 +937,7 @@ void LocalSpiller::RewriteMBB(MachineBasicBlock &MBB, VirtRegMap &VRM) {
             DOUT << "Removing now-noop copy: " << MI;
             MBB.erase(&MI);
             VRM.RemoveFromFoldedVirtMap(&MI);
+            Spills.UpdateLastUse(Src, NULL);
             Spills.disallowClobberPhysReg(VirtReg);
             goto ProcessNextInst;
           }