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author | Chris Lattner <sabre@nondot.org> | 2003-12-11 22:23:32 +0000 |
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committer | Chris Lattner <sabre@nondot.org> | 2003-12-11 22:23:32 +0000 |
commit | ea9403f2aa078e840a49792d906390395f0cd2f6 (patch) | |
tree | d7e17e1e55c502f10c6490c465d0fe79edafc82d /lib/Transforms/Scalar | |
parent | 0ac4d9247b8b9732b2d49cdf31c5327ec37a44ec (diff) | |
download | external_llvm-ea9403f2aa078e840a49792d906390395f0cd2f6.zip external_llvm-ea9403f2aa078e840a49792d906390395f0cd2f6.tar.gz external_llvm-ea9403f2aa078e840a49792d906390395f0cd2f6.tar.bz2 |
Fix LICM/2003-12-11-SinkingToPHI.ll, and quite possibly all of the other known problems in the universe.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10409 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/Transforms/Scalar')
-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; } |