diff options
Diffstat (limited to 'lib/Transforms/Vectorize/LoopVectorize.cpp')
| -rw-r--r-- | lib/Transforms/Vectorize/LoopVectorize.cpp | 9 |
1 files changed, 6 insertions, 3 deletions
diff --git a/lib/Transforms/Vectorize/LoopVectorize.cpp b/lib/Transforms/Vectorize/LoopVectorize.cpp index 799eef21dc4e..1abdb2484850 100644 --- a/lib/Transforms/Vectorize/LoopVectorize.cpp +++ b/lib/Transforms/Vectorize/LoopVectorize.cpp @@ -485,8 +485,7 @@ protected: /// of scalars. If \p IfPredicateInstr is true we need to 'hide' each /// scalarized instruction behind an if block predicated on the control /// dependence of the instruction. - virtual void scalarizeInstruction(Instruction *Instr, - bool IfPredicateInstr = false); + void scalarizeInstruction(Instruction *Instr, bool IfPredicateInstr = false); /// Vectorize Load and Store instructions, virtual void vectorizeMemoryInstruction(Instruction *Instr); @@ -3815,7 +3814,11 @@ void InnerLoopVectorizer::truncateToMinimalBitwidths() { if (auto *BO = dyn_cast<BinaryOperator>(I)) { NewI = B.CreateBinOp(BO->getOpcode(), ShrinkOperand(BO->getOperand(0)), ShrinkOperand(BO->getOperand(1))); - cast<BinaryOperator>(NewI)->copyIRFlags(I); + + // Any wrapping introduced by shrinking this operation shouldn't be + // considered undefined behavior. So, we can't unconditionally copy + // arithmetic wrapping flags to NewI. + cast<BinaryOperator>(NewI)->copyIRFlags(I, /*IncludeWrapFlags=*/false); } else if (auto *CI = dyn_cast<ICmpInst>(I)) { NewI = B.CreateICmp(CI->getPredicate(), ShrinkOperand(CI->getOperand(0)), |