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Fix LICM/2003-12-11-SinkingToPHI.ll, and quite possibly all of the other known problems in the universe.

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llvm-svn: 10409
This commit is contained in:
Chris Lattner 2003-12-11 22:23:32 +00:00
parent 5c22cf763f
commit 1f7737b44f
1 changed files with 11 additions and 2 deletions
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13
lib/Transforms/Scalar/LICM.cpp
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@ -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;
}