Instruction *foldExtractOfOverflowIntrinsic(ExtractValueInst &EV);
Instruction *foldIntrinsicWithOverflowCommon(IntrinsicInst *II);
Instruction *foldFPSignBitOps(BinaryOperator &I);
+ Instruction *foldFDivConstantDivisor(BinaryOperator &I);
// Optimize one of these forms:
// and i1 Op, SI / select i1 Op, i1 SI, i1 false (if IsAnd = true)
}
/// Remove negation and try to convert division into multiplication.
-static Instruction *foldFDivConstantDivisor(BinaryOperator &I) {
+Instruction *InstCombinerImpl::foldFDivConstantDivisor(BinaryOperator &I) {
Constant *C;
if (!match(I.getOperand(1), m_Constant(C)))
return nullptr;
if (Constant *NegC = ConstantFoldUnaryOpOperand(Instruction::FNeg, C, DL))
return BinaryOperator::CreateFDivFMF(X, NegC, &I);
+ // nnan X / +0.0 -> copysign(inf, X)
+ if (I.hasNoNaNs() && match(I.getOperand(1), m_Zero())) {
+ IRBuilder<> B(&I);
+ // TODO: nnan nsz X / -0.0 -> copysign(inf, X)
+ CallInst *CopySign = B.CreateIntrinsic(
+ Intrinsic::copysign, {C->getType()},
+ {ConstantFP::getInfinity(I.getType()), I.getOperand(0)}, &I);
+ CopySign->takeName(&I);
+ return replaceInstUsesWith(I, CopySign);
+ }
+
// If the constant divisor has an exact inverse, this is always safe. If not,
// then we can still create a reciprocal if fast-math-flags allow it and the
// constant is a regular number (not zero, infinite, or denormal).
; https://alive2.llvm.org/ce/z/gLBFKB
define float @fdiv_nnan_zero_f32(float %x) {
; CHECK-LABEL: @fdiv_nnan_zero_f32(
-; CHECK-NEXT: [[FDIV:%.*]] = fdiv nnan float [[X:%.*]], 0.000000e+00
+; CHECK-NEXT: [[FDIV:%.*]] = call nnan float @llvm.copysign.f32(float 0x7FF0000000000000, float [[X:%.*]])
; CHECK-NEXT: ret float [[FDIV]]
;
%fdiv = fdiv nnan float %x, 0.0
define <2 x float> @fdiv_nnan_zero_v2f32(<2 x float> %x) {
; CHECK-LABEL: @fdiv_nnan_zero_v2f32(
-; CHECK-NEXT: [[FDIV:%.*]] = fdiv nnan <2 x float> [[X:%.*]], zeroinitializer
+; CHECK-NEXT: [[FDIV:%.*]] = call nnan <2 x float> @llvm.copysign.v2f32(<2 x float> <float 0x7FF0000000000000, float 0x7FF0000000000000>, <2 x float> [[X:%.*]])
; CHECK-NEXT: ret <2 x float> [[FDIV]]
;
%fdiv = fdiv nnan <2 x float> %x, zeroinitializer
define float @fdiv_nnan_zero_f32_fmf(float %x) {
; CHECK-LABEL: @fdiv_nnan_zero_f32_fmf(
-; CHECK-NEXT: [[FDIV:%.*]] = fdiv nnan nsz float [[X:%.*]], 0.000000e+00
+; CHECK-NEXT: [[FDIV:%.*]] = call nnan nsz float @llvm.copysign.f32(float 0x7FF0000000000000, float [[X:%.*]])
; CHECK-NEXT: ret float [[FDIV]]
;
%fdiv = fdiv nnan nsz float %x, 0.0
define <2 x float> @fdiv_nnan_zero_v2f32_fmf(<2 x float> %x) {
; CHECK-LABEL: @fdiv_nnan_zero_v2f32_fmf(
-; CHECK-NEXT: [[FDIV:%.*]] = fdiv nnan nsz <2 x float> [[X:%.*]], zeroinitializer
+; CHECK-NEXT: [[FDIV:%.*]] = call nnan nsz <2 x float> @llvm.copysign.v2f32(<2 x float> <float 0x7FF0000000000000, float 0x7FF0000000000000>, <2 x float> [[X:%.*]])
; CHECK-NEXT: ret <2 x float> [[FDIV]]
;
%fdiv = fdiv nnan nsz <2 x float> %x, zeroinitializer