diff options
Diffstat (limited to 'llvm/lib/Transforms')
| -rw-r--r-- | llvm/lib/Transforms/InstCombine/InstructionCombining.cpp | 9 |
1 files changed, 9 insertions, 0 deletions
diff --git a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp index a64c188..0f5e867 100644 --- a/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp +++ b/llvm/lib/Transforms/InstCombine/InstructionCombining.cpp @@ -1697,6 +1697,15 @@ Instruction *InstCombinerImpl::FoldOpIntoSelect(Instruction &Op, SelectInst *SI, if (SI->getType()->isIntOrIntVectorTy(1)) return nullptr; + // Avoid breaking min/max reduction pattern, + // which is necessary for vectorization later. + if (isa<MinMaxIntrinsic>(&Op)) + for (Value *IntrinOp : Op.operands()) + if (auto *PN = dyn_cast<PHINode>(IntrinOp)) + for (Value *PhiOp : PN->operands()) + if (PhiOp == &Op) + return nullptr; + // Test if a FCmpInst instruction is used exclusively by a select as // part of a minimum or maximum operation. If so, refrain from doing // any other folding. This helps out other analyses which understand |