From 73a9eb9f815896ac8d766101eeb7f3c32f77257d Mon Sep 17 00:00:00 2001
From: Jakob Stoklund Olesen <stoklund@2pi.dk>
Date: Sun, 24 Jul 2011 20:33:23 +0000
Subject: Never extend live ranges for <undef> uses.

llvm-svn: 135886
---
 llvm/lib/CodeGen/SplitKit.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

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

diff --git a/llvm/lib/CodeGen/SplitKit.cpp b/llvm/lib/CodeGen/SplitKit.cpp
index 46a43d8bd72..2197046b030 100644
--- a/llvm/lib/CodeGen/SplitKit.cpp
+++ b/llvm/lib/CodeGen/SplitKit.cpp
@@ -952,7 +952,7 @@ void SplitEditor::rewriteAssigned(bool ExtendRanges) {
                  << Idx << ':' << RegIdx << '\t' << *MI);
 
     // Extend liveness to Idx if the instruction reads reg.
-    if (!ExtendRanges)
+    if (!ExtendRanges || MO.isUndef())
       continue;
 
     // Skip instructions that don't read Reg.
-- 
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