diff options
Diffstat (limited to 'lib/Transforms/Utils/Local.cpp')
| -rw-r--r-- | lib/Transforms/Utils/Local.cpp | 34 |
1 files changed, 0 insertions, 34 deletions
diff --git a/lib/Transforms/Utils/Local.cpp b/lib/Transforms/Utils/Local.cpp index 4ce9d8f11a..9744af3c60 100644 --- a/lib/Transforms/Utils/Local.cpp +++ b/lib/Transforms/Utils/Local.cpp @@ -406,37 +406,3 @@ bool llvm::dceInstruction(BasicBlock::iterator &BBI) { } return false; } - -//===----------------------------------------------------------------------===// -// PHI Instruction Simplification -// - -/// hasConstantValue - If the specified PHI node always merges together the same -/// value, return the value, otherwise return null. -/// -Value *llvm::hasConstantValue(PHINode *PN) { - // If the PHI node only has one incoming value, eliminate the PHI node... - if (PN->getNumIncomingValues() == 1) - return PN->getIncomingValue(0); - - // Otherwise if all of the incoming values are the same for the PHI, replace - // the PHI node with the incoming value. - // - Value *InVal = 0; - for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) - if (PN->getIncomingValue(i) != PN && // Not the PHI node itself... - !isa<UndefValue>(PN->getIncomingValue(i))) - if (InVal && PN->getIncomingValue(i) != InVal) - return 0; // Not the same, bail out. - else - InVal = PN->getIncomingValue(i); - - // The only case that could cause InVal to be null is if we have a PHI node - // that only has entries for itself. In this case, there is no entry into the - // loop, so kill the PHI. - // - if (InVal == 0) InVal = UndefValue::get(PN->getType()); - - // All of the incoming values are the same, return the value now. - return InVal; -} |