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[LoopVectorizer] Enable support for floating-point subtraction reductions

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@215200 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
James Molloy
2014-08-08 12:41:08 +00:00
parent 3a106a2813
commit 414df79b80
2 changed files with 24 additions and 1 deletions
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lib/Transforms/Vectorize/LoopVectorize.cpp
+2 -1
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@@ -5136,7 +5136,7 @@ LoopVectorizationLegality::isReductionInstr(Instruction *I,
ReductionKind Kind,
ReductionInstDesc &Prev) {
bool FP = I->getType()->isFloatingPointTy();
bool FastMath = (FP && I->isCommutative() && I->isAssociative());
bool FastMath = FP && I->hasUnsafeAlgebra();
switch (I->getOpcode()) {
default:
return ReductionInstDesc(false, I);
@@ -5158,6 +5158,7 @@ LoopVectorizationLegality::isReductionInstr(Instruction *I,
return ReductionInstDesc(Kind == RK_IntegerXor, I);
case Instruction::FMul:
return ReductionInstDesc(Kind == RK_FloatMult && FastMath, I);
case Instruction::FSub:
case Instruction::FAdd:
return ReductionInstDesc(Kind == RK_FloatAdd && FastMath, I);
case Instruction::FCmp: