commit b0a6f62c9b2e75fc509d84310a9795ffacbc6796
author Evan Cheng <evan.cheng@apple.com> Tue May 20 08:10:37 2008 +0000
committer Evan Cheng <evan.cheng@apple.com> Tue May 20 08:10:37 2008 +0000
tree db8cef12c8f3cbf2cb705d2bfbe773a8d1a5cf2b
parent 6e7b322d36fc9e571cd54cb4b9c6043346a97e3a

Don't spill dead def.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@51305 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/LiveIntervalAnalysis.cpp

diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp
index 8b25344..2558b09 100644
--- a/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -1562,7 +1562,9 @@
         if (!Folded) {
           LiveRange *LR = &nI.ranges[nI.ranges.size()-1];
           bool isKill = LR->end == getStoreIndex(index);
-          vrm.addSpillPoint(VReg, isKill, MI);
+          if (!MI->registerDefIsDead(nI.reg))
+            // No need to spill a dead def.
+            vrm.addSpillPoint(VReg, isKill, MI);
           if (isKill)
             AddedKill.insert(&nI);
         }