diff options
Diffstat (limited to 'lib/Transforms/Utils/Local.cpp')
| -rw-r--r-- | lib/Transforms/Utils/Local.cpp | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/lib/Transforms/Utils/Local.cpp b/lib/Transforms/Utils/Local.cpp index 8c08638c4c..f5477f093c 100644 --- a/lib/Transforms/Utils/Local.cpp +++ b/lib/Transforms/Utils/Local.cpp @@ -20,6 +20,7 @@ #include "llvm/Instructions.h" #include "llvm/Intrinsics.h" #include "llvm/IntrinsicInst.h" +#include "llvm/LLVMContext.h" #include "llvm/ADT/SmallPtrSet.h" #include "llvm/Analysis/ConstantFolding.h" #include "llvm/Analysis/DebugInfo.h" @@ -262,7 +263,8 @@ void llvm::RecursivelyDeleteTriviallyDeadInstructions(Value *V) { /// too, recursively. void llvm::RecursivelyDeleteDeadPHINode(PHINode *PN) { - + LLVMContext* Context = PN->getParent()->getContext(); + // We can remove a PHI if it is on a cycle in the def-use graph // where each node in the cycle has degree one, i.e. only one use, // and is an instruction with no side effects. @@ -279,7 +281,7 @@ llvm::RecursivelyDeleteDeadPHINode(PHINode *PN) { if (PHINode *JP = dyn_cast<PHINode>(J)) if (!PHIs.insert(cast<PHINode>(JP))) { // Break the cycle and delete the PHI and its operands. - JP->replaceAllUsesWith(UndefValue::get(JP->getType())); + JP->replaceAllUsesWith(Context->getUndef(JP->getType())); RecursivelyDeleteTriviallyDeadInstructions(JP); break; } @@ -299,7 +301,7 @@ void llvm::MergeBasicBlockIntoOnlyPred(BasicBlock *DestBB) { while (PHINode *PN = dyn_cast<PHINode>(DestBB->begin())) { Value *NewVal = PN->getIncomingValue(0); // Replace self referencing PHI with undef, it must be dead. - if (NewVal == PN) NewVal = UndefValue::get(PN->getType()); + if (NewVal == PN) NewVal = DestBB->getContext()->getUndef(PN->getType()); PN->replaceAllUsesWith(NewVal); PN->eraseFromParent(); } |