diff options
Diffstat (limited to 'lib/Transforms')
| -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) { |