From c8b028daa462e51703815def156e2a3219aa41be Mon Sep 17 00:00:00 2001
From: Evan Cheng <evan.cheng@apple.com>
Date: Tue, 20 May 2008 08:10:37 +0000
Subject: Don't spill dead def.

llvm-svn: 51305
---
 llvm/lib/CodeGen/LiveIntervalAnalysis.cpp | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

(limited to 'llvm/lib/CodeGen/LiveIntervalAnalysis.cpp')

diff --git a/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp b/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
index 8b25344b477..2558b09ad60 100644
--- a/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
+++ b/llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
@@ -1562,7 +1562,9 @@ addIntervalsForSpills(const LiveInterval &li,
         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);
         }
-- 
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