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[X86] Auto upgrade SSE/AVX PABS intrinsics to generic Intrinsic::abs

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Minor followup to D87101, we were expanding this to a neg+icmp+select pattern like we were in CGBuiltin
This commit is contained in:
Simon Pilgrim 2020-09-07 15:07:26 +01:00
parent 36ca61598a
commit e1f9ca6993
1 changed files with 4 additions and 8 deletions
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12
lib/IR/AutoUpgrade.cpp
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@ -1375,16 +1375,12 @@ static Value *UpgradeMaskedLoad(IRBuilder<> &Builder,
}
static Value *upgradeAbs(IRBuilder<> &Builder, CallInst &CI) {
Type *Ty = CI.getType();
Value *Op0 = CI.getArgOperand(0);
llvm::Type *Ty = Op0->getType();
Value *Zero = llvm::Constant::getNullValue(Ty);
Value *Cmp = Builder.CreateICmp(ICmpInst::ICMP_SGT, Op0, Zero);
Value *Neg = Builder.CreateNeg(Op0);
Value *Res = Builder.CreateSelect(Cmp, Op0, Neg);
Function *F = Intrinsic::getDeclaration(CI.getModule(), Intrinsic::abs, Ty);
Value *Res = Builder.CreateCall(F, {Op0, Builder.getInt1(false)});
if (CI.getNumArgOperands() == 3)
Res = EmitX86Select(Builder,CI.getArgOperand(2), Res, CI.getArgOperand(1));
Res = EmitX86Select(Builder, CI.getArgOperand(2), Res, CI.getArgOperand(1));
return Res;
}