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| author | Evan Cheng <evan.cheng@apple.com> | 2007-12-12 00:51:06 +0000 |
|---|---|---|
| committer | Evan Cheng <evan.cheng@apple.com> | 2007-12-12 00:51:06 +0000 |
| commit | 772de516b6851e679d3da9e5171712b9c3122019 (patch) | |
| tree | f755907a4be8f35a0933a8fcc33756c7d1d64fc5 | |
| parent | 3a3f163ba620c771238130905b873826af33b022 (diff) | |
Bug fix. Only safe to perform extension uses optimization if the source of extension is also defined in the same BB as the extension.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44896 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/Transforms/Scalar/CodeGenPrepare.cpp | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/Transforms/Scalar/CodeGenPrepare.cpp b/lib/Transforms/Scalar/CodeGenPrepare.cpp index 594c017ba8..37a645f3ce 100644 --- a/lib/Transforms/Scalar/CodeGenPrepare.cpp +++ b/lib/Transforms/Scalar/CodeGenPrepare.cpp @@ -929,6 +929,11 @@ bool CodeGenPrepare::OptimizeExtUses(Instruction *I) { if (Src->hasOneUse()) return false; + // Only safe to perform the optimization if the source is also defined in + // this block. + if (DefBB != cast<Instruction>(Src)->getParent()) + return false; + bool DefIsLiveOut = false; for (Value::use_iterator UI = I->use_begin(), E = I->use_end(); UI != E; ++UI) { |