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[InstSimplify] Add basic constant folding for llvm.sincos #114527

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Merged
merged 4 commits into from
Dec 8, 2024
Merged

[InstSimplify] Add basic constant folding for llvm.sincos #114527

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367901a
[InstSimplify] Add basic constant folding for `llvm.sincos`
MacDue Sep 6, 2024
1f8148a
Fix typo
MacDue Nov 4, 2024
6d94301
Add normal value tests
MacDue Nov 8, 2024
88887df
Fixups
MacDue Nov 25, 2024
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39 changes: 39 additions & 0 deletions llvm/lib/Analysis/ConstantFolding.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1567,6 +1567,7 @@ bool llvm::canConstantFoldCallTo(const CallBase *Call, const Function *F) {
case Intrinsic::sqrt:
case Intrinsic::sin:
case Intrinsic::cos:
case Intrinsic::sincos:
case Intrinsic::pow:
case Intrinsic::powi:
case Intrinsic::ldexp:
Expand Down Expand Up @@ -3466,6 +3467,44 @@ ConstantFoldStructCall(StringRef Name, Intrinsic::ID IntrinsicID,
return nullptr;
return ConstantStruct::get(StTy, Result0, Result1);
}
case Intrinsic::sincos: {
Type *Ty = StTy->getContainedType(0);
Type *TyScalar = Ty->getScalarType();

auto ConstantFoldScalarSincosCall =
[&](Constant *Op) -> std::pair<Constant *, Constant *> {
Constant *SinResult =
ConstantFoldScalarCall(Name, Intrinsic::sin, TyScalar, Op, TLI, Call);
if (!SinResult)
return {};
Constant *CosResult =
ConstantFoldScalarCall(Name, Intrinsic::cos, TyScalar, Op, TLI, Call);
if (!CosResult)
return {};
return std::make_pair(SinResult, CosResult);
};

if (auto *FVTy = dyn_cast<FixedVectorType>(Ty)) {
SmallVector<Constant *, 4> SinResults(FVTy->getNumElements());
SmallVector<Constant *, 4> CosResults(FVTy->getNumElements());

for (unsigned I = 0, E = FVTy->getNumElements(); I != E; ++I) {
Constant *Lane = Operands[0]->getAggregateElement(I);
std::tie(SinResults[I], CosResults[I]) =
ConstantFoldScalarSincosCall(Lane);
if (!SinResults[I])
return nullptr;
}

return ConstantStruct::get(StTy, ConstantVector::get(SinResults),
ConstantVector::get(CosResults));
}

auto [SinResult, CosResult] = ConstantFoldScalarSincosCall(Operands[0]);
if (!SinResult)
return nullptr;
return ConstantStruct::get(StTy, SinResult, CosResult);
}
default:
// TODO: Constant folding of vector intrinsics that fall through here does
// not work (e.g. overflow intrinsics)
Expand Down
125 changes: 125 additions & 0 deletions llvm/test/Transforms/InstSimplify/sincos.ll
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@@ -0,0 +1,125 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 3
; RUN: opt -S -passes=instsimplify %s | FileCheck %s

define { float, float } @sincos_zero() {
; CHECK-LABEL: define { float, float } @sincos_zero() {
; CHECK-NEXT: ret { float, float } { float 0.000000e+00, float 1.000000e+00 }
;
%ret = call { float, float } @llvm.sincos.f32(float zeroinitializer)
ret { float, float } %ret
}

define { float, float } @sincos_neg_zero() {
; CHECK-LABEL: define { float, float } @sincos_neg_zero() {
; CHECK-NEXT: ret { float, float } { float -0.000000e+00, float 1.000000e+00 }
;
%ret = call { float, float } @llvm.sincos.f32(float -0.0)
ret { float, float } %ret
}

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No tests for normal values?

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I've added some normal value tests using matching the result values (and checking they're used consistently). I avoided this initially as the result for most normal values is displayed in hexadecimal (like 0x3FED18F6E0000000), which didn't seem that helpful.

define { <2 x float>, <2 x float> } @sincos_zero_vector() {
; CHECK-LABEL: define { <2 x float>, <2 x float> } @sincos_zero_vector() {
; CHECK-NEXT: ret { <2 x float>, <2 x float> } { <2 x float> zeroinitializer, <2 x float> <float 1.000000e+00, float 1.000000e+00> }
;
%ret = call { <2 x float>, <2 x float> } @llvm.sincos.v2f32(<2 x float> zeroinitializer)
ret { <2 x float>, <2 x float> } %ret
}

define { float, float } @sincos_poison() {
; CHECK-LABEL: define { float, float } @sincos_poison() {
; CHECK-NEXT: [[RET:%.*]] = call { float, float } @llvm.sincos.f32(float poison)
; CHECK-NEXT: ret { float, float } [[RET]]
;
%ret = call { float, float } @llvm.sincos.f32(float poison)
ret { float, float } %ret
}

define { <2 x float>, <2 x float> } @sincos_poison_vector() {
; CHECK-LABEL: define { <2 x float>, <2 x float> } @sincos_poison_vector() {
; CHECK-NEXT: [[RET:%.*]] = call { <2 x float>, <2 x float> } @llvm.sincos.v2f32(<2 x float> poison)
; CHECK-NEXT: ret { <2 x float>, <2 x float> } [[RET]]
;
%ret = call { <2 x float>, <2 x float> } @llvm.sincos.v2f32(<2 x float> poison)
ret { <2 x float>, <2 x float> } %ret
}

define { <vscale x 2 x float>, <vscale x 2 x float> } @sincos_poison_scalable_vector() {
; CHECK-LABEL: define { <vscale x 2 x float>, <vscale x 2 x float> } @sincos_poison_scalable_vector() {
; CHECK-NEXT: [[RET:%.*]] = call { <vscale x 2 x float>, <vscale x 2 x float> } @llvm.sincos.nxv2f32(<vscale x 2 x float> poison)
; CHECK-NEXT: ret { <vscale x 2 x float>, <vscale x 2 x float> } [[RET]]
;
%ret = call { <vscale x 2 x float>, <vscale x 2 x float> } @llvm.sincos.nxv2f32(<vscale x 2 x float> poison)
ret { <vscale x 2 x float>, <vscale x 2 x float> } %ret
}

define { float, float } @sincos_undef() {
; CHECK-LABEL: define { float, float } @sincos_undef() {
; CHECK-NEXT: [[RET:%.*]] = call { float, float } @llvm.sincos.f32(float undef)
; CHECK-NEXT: ret { float, float } [[RET]]
;
%ret = call { float, float } @llvm.sincos.f32(float undef)
ret { float, float } %ret
}

define { <2 x float>, <2 x float> } @sincos_undef_vector() {
; CHECK-LABEL: define { <2 x float>, <2 x float> } @sincos_undef_vector() {
; CHECK-NEXT: [[RET:%.*]] = call { <2 x float>, <2 x float> } @llvm.sincos.v2f32(<2 x float> undef)
; CHECK-NEXT: ret { <2 x float>, <2 x float> } [[RET]]
;
%ret = call { <2 x float>, <2 x float> } @llvm.sincos.v2f32(<2 x float> undef)
ret { <2 x float>, <2 x float> } %ret
}

define { <vscale x 2 x float>, <vscale x 2 x float> } @sincos_undef_scalable_vector() {
; CHECK-LABEL: define { <vscale x 2 x float>, <vscale x 2 x float> } @sincos_undef_scalable_vector() {
; CHECK-NEXT: [[RET:%.*]] = call { <vscale x 2 x float>, <vscale x 2 x float> } @llvm.sincos.nxv2f32(<vscale x 2 x float> undef)
; CHECK-NEXT: ret { <vscale x 2 x float>, <vscale x 2 x float> } [[RET]]
;
%ret = call { <vscale x 2 x float>, <vscale x 2 x float> } @llvm.sincos.nxv2f32(<vscale x 2 x float> undef)
ret { <vscale x 2 x float>, <vscale x 2 x float> } %ret
}

define { <vscale x 2 x float>, <vscale x 2 x float> } @sincos_zero_scalable_vector() {
; CHECK-LABEL: define { <vscale x 2 x float>, <vscale x 2 x float> } @sincos_zero_scalable_vector() {
; CHECK-NEXT: [[RET:%.*]] = call { <vscale x 2 x float>, <vscale x 2 x float> } @llvm.sincos.nxv2f32(<vscale x 2 x float> zeroinitializer)
; CHECK-NEXT: ret { <vscale x 2 x float>, <vscale x 2 x float> } [[RET]]
;
%ret = call { <vscale x 2 x float>, <vscale x 2 x float> } @llvm.sincos.nxv2f32(<vscale x 2 x float> zeroinitializer)
ret { <vscale x 2 x float>, <vscale x 2 x float> } %ret
}
Comment on lines +105 to +112
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In a follow up, should probably make sure the zero, undef, and splat cases work for scalable vectors


define { float, float } @sincos_inf() {
; CHECK-LABEL: define { float, float } @sincos_inf() {
; CHECK-NEXT: [[RET:%.*]] = call { float, float } @llvm.sincos.f32(float 0x7FF0000000000000)
; CHECK-NEXT: ret { float, float } [[RET]]
;
%ret = call { float, float } @llvm.sincos.f32(float 0x7FF0000000000000)
ret { float, float } %ret
}

define { float, float } @sincos_neginf() {
; CHECK-LABEL: define { float, float } @sincos_neginf() {
; CHECK-NEXT: [[RET:%.*]] = call { float, float } @llvm.sincos.f32(float 0xFFF0000000000000)
; CHECK-NEXT: ret { float, float } [[RET]]
;
%ret = call { float, float } @llvm.sincos.f32(float 0xFFF0000000000000)
ret { float, float } %ret
}

define { float, float } @sincos_qnan() {
; CHECK-LABEL: define { float, float } @sincos_qnan() {
; CHECK-NEXT: [[RET:%.*]] = call { float, float } @llvm.sincos.f32(float 0x7FF8000000000000)
; CHECK-NEXT: ret { float, float } [[RET]]
;
%ret = call { float, float } @llvm.sincos.f32(float 0x7FF8000000000000)
ret { float, float } %ret
}

define { float, float } @sincos_snan() {
; CHECK-LABEL: define { float, float } @sincos_snan() {
; CHECK-NEXT: [[RET:%.*]] = call { float, float } @llvm.sincos.f32(float 0x7FF0000020000000)
; CHECK-NEXT: ret { float, float } [[RET]]
;
%ret = call { float, float } @llvm.sincos.f32(float bitcast (i32 2139095041 to float))
ret { float, float } %ret
}
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