commit 81d686edbe6effe624add9394673bd571d89bfb7
author Jakob Stoklund Olesen <stoklund@2pi.dk> Sun Jul 24 20:33:23 2011 +0000
committer Jakob Stoklund Olesen <stoklund@2pi.dk> Sun Jul 24 20:33:23 2011 +0000
tree 3fa4f36d400c50524cbdeeb0f57a385e49183bf8
parent b09701db9e74298912164d988ddf40bb1b5ec19b

Never extend live ranges for <undef> uses.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135886 91177308-0d34-0410-b5e6-96231b3b80d8

lib/CodeGen/SplitKit.cpp

diff --git a/lib/CodeGen/SplitKit.cpp b/lib/CodeGen/SplitKit.cpp
index 46a43d8..2197046 100644
--- a/lib/CodeGen/SplitKit.cpp
+++ b/lib/CodeGen/SplitKit.cpp
@@ -952,7 +952,7 @@
                  << 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.