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Fix InstCombine/2007-02-23-PhiFoldInfLoop.ll and PR1217

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llvm-svn: 34546
This commit is contained in:
Chris Lattner 2007-02-24 01:03:45 +00:00
parent f222a6e498
commit 14217fb105
1 changed files with 2 additions and 1 deletions
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3
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -1641,11 +1641,12 @@ Instruction *InstCombiner::FoldOpIntoPhi(Instruction &I) {
// Check to see if all of the operands of the PHI are constants. If there is
// one non-constant value, remember the BB it is. If there is more than one
// bail out.
// or if *it* is a PHI, bail out.
BasicBlock *NonConstBB = 0;
for (unsigned i = 0; i != NumPHIValues; ++i)
if (!isa<Constant>(PN->getIncomingValue(i))) {
if (NonConstBB) return 0; // More than one non-const value.
if (isa<PHINode>(PN->getIncomingValue(i))) return 0; // Itself a phi.
NonConstBB = PN->getIncomingBlock(i);
// If the incoming non-constant value is in I's block, we have an infinite