From e57b2cbce652d45ed5516e52ad82991bfa03cfd7 Mon Sep 17 00:00:00 2001 From: Nadav Rotem Date: Wed, 31 Oct 2012 21:40:39 +0000 Subject: LoopVectorize: Preserve NSW, NUW and IsExact flags. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@167174 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Transforms/Vectorize/LoopVectorize.cpp | 13 ++++++++++++- 1 file changed, 12 insertions(+), 1 deletion(-) (limited to 'lib/Transforms/Vectorize/LoopVectorize.cpp') diff --git a/lib/Transforms/Vectorize/LoopVectorize.cpp b/lib/Transforms/Vectorize/LoopVectorize.cpp index 94e56a1713..c9871e25f1 100644 --- a/lib/Transforms/Vectorize/LoopVectorize.cpp +++ b/lib/Transforms/Vectorize/LoopVectorize.cpp @@ -849,8 +849,19 @@ SingleBlockLoopVectorizer::vectorizeLoop(LoopVectorizationLegality *Legal) { BinaryOperator *BinOp = dyn_cast(Inst); Value *A = getVectorValue(Inst->getOperand(0)); Value *B = getVectorValue(Inst->getOperand(1)); + // Use this vector value for all users of the original instruction. - WidenMap[Inst] = Builder.CreateBinOp(BinOp->getOpcode(), A, B); + Value *V = Builder.CreateBinOp(BinOp->getOpcode(), A, B); + WidenMap[Inst] = V; + + // Update the NSW, NUW and Exact flags. + BinaryOperator *VecOp = cast(V); + if (isa(BinOp)) { + VecOp->setHasNoSignedWrap(BinOp->hasNoSignedWrap()); + VecOp->setHasNoUnsignedWrap(BinOp->hasNoUnsignedWrap()); + } + if (isa(VecOp)) + VecOp->setIsExact(BinOp->isExact()); break; } case Instruction::Select: { -- cgit v1.2.3-18-g5258