diff options
Diffstat (limited to 'llvm/lib/Transforms/Scalar/GVN.cpp')
| -rw-r--r-- | llvm/lib/Transforms/Scalar/GVN.cpp | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/llvm/lib/Transforms/Scalar/GVN.cpp b/llvm/lib/Transforms/Scalar/GVN.cpp index 119a9e4a841..ab6c913605e 100644 --- a/llvm/lib/Transforms/Scalar/GVN.cpp +++ b/llvm/lib/Transforms/Scalar/GVN.cpp @@ -723,7 +723,8 @@ Value *GVN::GetValueForBlock(BasicBlock *BB, LoadInst* orig, return V = GetValueForBlock(IDom->getBlock(), orig, Phis); } - + if (std::distance(pred_begin(BB), pred_end(BB)) == 1) + return V = GetValueForBlock(IDom->getBlock(), orig, Phis); // Otherwise, the idom is the loop, so we need to insert a PHI node. Do so // now, then get values to fill in the incoming values for the PHI. @@ -731,10 +732,10 @@ Value *GVN::GetValueForBlock(BasicBlock *BB, LoadInst* orig, BB->begin()); PN->reserveOperandSpace(std::distance(pred_begin(BB), pred_end(BB))); V = PN; - + // Fill in the incoming values for the block. for (pred_iterator PI = pred_begin(BB), E = pred_end(BB); PI != E; ++PI) - PN->addIncoming(GetValueForBlock(DT.getNode(*PI)->getBlock(), orig, Phis), *PI); + PN->addIncoming(GetValueForBlock(*PI, orig, Phis), *PI); return PN; } |
