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Never extend live ranges for <undef> uses.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135886 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-07-24 20:33:23 +00:00
parent b09701db9e
commit 81d686edbe
1 changed files with 1 additions and 1 deletions
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lib/CodeGen/SplitKit.cpp
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@ -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.