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[AMDGPU][ConstantFolding] Fold llvm.amdgcn.fract intrinsic
Reviewers: nhaehnle, arsenm, rampitec Subscribers: kzhuravl, jvesely, wdng, yaxunl, dstuttard, tpr, t-tye, hiraditya, kerbowa, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D75179
This commit is contained in:
Jay Foad
parent
d878f59441
commit
7d1b7cc031
@ -1460,6 +1460,7 @@ bool llvm::canConstantFoldCallTo(const CallBase *Call, const Function *F) {
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case Intrinsic::convert_to_fp16:
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case Intrinsic::bitreverse:
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case Intrinsic::amdgcn_fmul_legacy:
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case Intrinsic::amdgcn_fract:
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case Intrinsic::x86_sse_cvtss2si:
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case Intrinsic::x86_sse_cvtss2si64:
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case Intrinsic::x86_sse_cvttss2si:
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@ -1786,10 +1787,23 @@ static Constant *ConstantFoldScalarCall1(StringRef Name,
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return ConstantFP::get(Ty->getContext(), U);
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}
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if (IntrinsicID == Intrinsic::amdgcn_fract) {
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// The v_fract instruction behaves like the OpenCL spec, which defines
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// fract(x) as fmin(x - floor(x), 0x1.fffffep-1f): "The min() operator is
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// there to prevent fract(-small) from returning 1.0. It returns the
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// largest positive floating-point number less than 1.0."
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APFloat FloorU(U);
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FloorU.roundToIntegral(APFloat::rmTowardNegative);
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APFloat FractU(U - FloorU);
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APFloat AlmostOne(U.getSemantics(), 1);
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AlmostOne.next(/*nextDown*/ true);
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return ConstantFP::get(Ty->getContext(), minimum(FractU, AlmostOne));
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}
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/// We only fold functions with finite arguments. Folding NaN and inf is
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/// likely to be aborted with an exception anyway, and some host libms
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/// have known errors raising exceptions.
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if (Op->getValueAPF().isNaN() || Op->getValueAPF().isInfinity())
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if (!U.isFinite())
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return nullptr;
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/// Currently APFloat versions of these functions do not exist, so we use
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126
test/Analysis/ConstantFolding/AMDGPU/fract.ll
Normal file
126
test/Analysis/ConstantFolding/AMDGPU/fract.ll
Normal file
@ -0,0 +1,126 @@
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; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
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; RUN: opt < %s -instsimplify -S | FileCheck %s
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declare half @llvm.amdgcn.fract.f16(half)
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declare float @llvm.amdgcn.fract.f32(float)
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declare double @llvm.amdgcn.fract.f64(double)
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define void @test_f16(half* %p) {
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; CHECK-LABEL: @test_f16(
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; CHECK-NEXT: store volatile half 0xH0000, half* [[P:%.*]]
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; CHECK-NEXT: store volatile half 0xH0000, half* [[P]]
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; CHECK-NEXT: store volatile half 0xH0000, half* [[P]]
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; CHECK-NEXT: store volatile half 0xH0000, half* [[P]]
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; CHECK-NEXT: store volatile half 0xH3400, half* [[P]]
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; CHECK-NEXT: store volatile half 0xH3B00, half* [[P]]
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; CHECK-NEXT: store volatile half 0xH0400, half* [[P]]
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; CHECK-NEXT: store volatile half 0xH3BFF, half* [[P]]
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; CHECK-NEXT: store volatile half 0xH7E00, half* [[P]]
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; CHECK-NEXT: store volatile half 0xH7E00, half* [[P]]
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; CHECK-NEXT: store volatile half 0xH7E00, half* [[P]]
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; CHECK-NEXT: ret void
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;
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%p0 = call half @llvm.amdgcn.fract.f16(half +0.0)
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store volatile half %p0, half* %p
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%n0 = call half @llvm.amdgcn.fract.f16(half -0.0)
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store volatile half %n0, half* %p
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%p1 = call half @llvm.amdgcn.fract.f16(half +1.0)
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store volatile half %p1, half* %p
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%n1 = call half @llvm.amdgcn.fract.f16(half -1.0)
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store volatile half %n1, half* %p
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%p225 = call half @llvm.amdgcn.fract.f16(half +2.25)
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store volatile half %p225, half* %p
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%n6125 = call half @llvm.amdgcn.fract.f16(half -6.125)
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store volatile half %n6125, half* %p
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%ptiny = call half @llvm.amdgcn.fract.f16(half 0xH0400) ; +min normal
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store volatile half %ptiny, half* %p
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%ntiny = call half @llvm.amdgcn.fract.f16(half 0xH8400) ; -min normal
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store volatile half %ntiny, half* %p
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%pinf = call half @llvm.amdgcn.fract.f16(half 0xH7C00) ; +inf
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store volatile half %pinf, half* %p
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%ninf = call half @llvm.amdgcn.fract.f16(half 0xHFC00) ; -inf
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store volatile half %ninf, half* %p
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%nan = call half @llvm.amdgcn.fract.f16(half 0xH7E00) ; nan
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store volatile half %nan, half* %p
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ret void
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}
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define void @test_f32(float* %p) {
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; CHECK-LABEL: @test_f32(
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; CHECK-NEXT: store volatile float 0.000000e+00, float* [[P:%.*]]
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; CHECK-NEXT: store volatile float 0.000000e+00, float* [[P]]
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; CHECK-NEXT: store volatile float 0.000000e+00, float* [[P]]
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; CHECK-NEXT: store volatile float 0.000000e+00, float* [[P]]
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; CHECK-NEXT: store volatile float 2.500000e-01, float* [[P]]
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; CHECK-NEXT: store volatile float 8.750000e-01, float* [[P]]
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; CHECK-NEXT: store volatile float 0x3810000000000000, float* [[P]]
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; CHECK-NEXT: store volatile float 0x3FEFFFFFE0000000, float* [[P]]
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; CHECK-NEXT: store volatile float 0x7FF8000000000000, float* [[P]]
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; CHECK-NEXT: store volatile float 0x7FF8000000000000, float* [[P]]
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; CHECK-NEXT: store volatile float 0x7FF8000000000000, float* [[P]]
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; CHECK-NEXT: ret void
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;
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%p0 = call float @llvm.amdgcn.fract.f32(float +0.0)
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store volatile float %p0, float* %p
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%n0 = call float @llvm.amdgcn.fract.f32(float -0.0)
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store volatile float %n0, float* %p
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%p1 = call float @llvm.amdgcn.fract.f32(float +1.0)
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store volatile float %p1, float* %p
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%n1 = call float @llvm.amdgcn.fract.f32(float -1.0)
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store volatile float %n1, float* %p
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%p225 = call float @llvm.amdgcn.fract.f32(float +2.25)
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store volatile float %p225, float* %p
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%n6125 = call float @llvm.amdgcn.fract.f32(float -6.125)
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store volatile float %n6125, float* %p
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%ptiny = call float @llvm.amdgcn.fract.f32(float 0x3810000000000000) ; +min normal
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store volatile float %ptiny, float* %p
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%ntiny = call float @llvm.amdgcn.fract.f32(float 0xB810000000000000) ; -min normal
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store volatile float %ntiny, float* %p
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%pinf = call float @llvm.amdgcn.fract.f32(float 0x7FF0000000000000) ; +inf
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store volatile float %pinf, float* %p
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%ninf = call float @llvm.amdgcn.fract.f32(float 0xFFF0000000000000) ; -inf
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store volatile float %ninf, float* %p
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%nan = call float @llvm.amdgcn.fract.f32(float 0x7FF8000000000000) ; nan
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store volatile float %nan, float* %p
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ret void
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}
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define void @test_f64(double* %p) {
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; CHECK-LABEL: @test_f64(
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; CHECK-NEXT: store volatile double 0.000000e+00, double* [[P:%.*]]
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; CHECK-NEXT: store volatile double 0.000000e+00, double* [[P]]
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; CHECK-NEXT: store volatile double 0.000000e+00, double* [[P]]
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; CHECK-NEXT: store volatile double 0.000000e+00, double* [[P]]
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; CHECK-NEXT: store volatile double 2.500000e-01, double* [[P]]
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; CHECK-NEXT: store volatile double 8.750000e-01, double* [[P]]
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; CHECK-NEXT: store volatile double 2.000000e-308, double* [[P]]
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; CHECK-NEXT: store volatile double 0x3FEFFFFFFFFFFFFF, double* [[P]]
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; CHECK-NEXT: store volatile double 0x7FF8000000000000, double* [[P]]
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; CHECK-NEXT: store volatile double 0x7FF8000000000000, double* [[P]]
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; CHECK-NEXT: store volatile double 0x7FF8000000000000, double* [[P]]
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; CHECK-NEXT: ret void
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;
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%p0 = call double @llvm.amdgcn.fract.f64(double +0.0)
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store volatile double %p0, double* %p
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%n0 = call double @llvm.amdgcn.fract.f64(double -0.0)
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store volatile double %n0, double* %p
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%p1 = call double @llvm.amdgcn.fract.f64(double +1.0)
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store volatile double %p1, double* %p
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%n1 = call double @llvm.amdgcn.fract.f64(double -1.0)
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store volatile double %n1, double* %p
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%p225 = call double @llvm.amdgcn.fract.f64(double +2.25)
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store volatile double %p225, double* %p
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%n6125 = call double @llvm.amdgcn.fract.f64(double -6.125)
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store volatile double %n6125, double* %p
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%ptiny = call double @llvm.amdgcn.fract.f64(double +2.0e-308) ; +min normal
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store volatile double %ptiny, double* %p
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%ntiny = call double @llvm.amdgcn.fract.f64(double -2.0e-308) ; -min normal
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store volatile double %ntiny, double* %p
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%pinf = call double @llvm.amdgcn.fract.f64(double 0x7FF0000000000000) ; +inf
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store volatile double %pinf, double* %p
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%ninf = call double @llvm.amdgcn.fract.f64(double 0xFFF0000000000000) ; -inf
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store volatile double %ninf, double* %p
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%nan = call double @llvm.amdgcn.fract.f64(double 0x7FF8000000000000) ; nan
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store volatile double %nan, double* %p
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ret void
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}
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