diff options
| -rw-r--r-- | lib/Transforms/Scalar/LICM.cpp | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/lib/Transforms/Scalar/LICM.cpp b/lib/Transforms/Scalar/LICM.cpp index 0d8a848..3365e64 100644 --- a/lib/Transforms/Scalar/LICM.cpp +++ b/lib/Transforms/Scalar/LICM.cpp @@ -337,9 +337,18 @@ bool LICM::canSinkOrHoistInst(Instruction &I) { /// exit blocks of the loop. /// bool LICM::isNotUsedInLoop(Instruction &I) { - for (Value::use_iterator UI = I.use_begin(), E = I.use_end(); UI != E; ++UI) - if (CurLoop->contains(cast<Instruction>(*UI)->getParent())) + for (Value::use_iterator UI = I.use_begin(), E = I.use_end(); UI != E; ++UI) { + Instruction *User = cast<Instruction>(*UI); + if (PHINode *PN = dyn_cast<PHINode>(User)) { + // PHI node uses occur in predecessor blocks! + for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) + if (PN->getIncomingValue(i) == &I) + if (CurLoop->contains(PN->getIncomingBlock(i))) + return false; + } else if (CurLoop->contains(User->getParent())) { return false; + } + } return true; } |