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[ConstantFolding] Add support for llvm.atan in constant folding. #143416

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Jun 9, 2025
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[ConstantFolding] Add support for llvm.atan in constant folding. #143416

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3 changes: 3 additions & 0 deletions llvm/lib/Analysis/ConstantFolding.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1672,6 +1672,7 @@ bool llvm::canConstantFoldCallTo(const CallBase *Call, const Function *F) {
case Intrinsic::sincos:
case Intrinsic::sinh:
case Intrinsic::cosh:
case Intrinsic::atan:
case Intrinsic::pow:
case Intrinsic::powi:
case Intrinsic::ldexp:
Expand Down Expand Up @@ -2538,6 +2539,8 @@ static Constant *ConstantFoldScalarCall1(StringRef Name,
return ConstantFoldFP(sinh, APF, Ty);
case Intrinsic::cosh:
return ConstantFoldFP(cosh, APF, Ty);
case Intrinsic::atan:
return ConstantFoldFP(atan, APF, Ty);
case Intrinsic::sqrt:
return ConstantFoldFP(sqrt, APF, Ty);
case Intrinsic::amdgcn_cos:
Expand Down
88 changes: 88 additions & 0 deletions llvm/test/Transforms/InstSimplify/ConstProp/atan-intrinsic.ll
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@@ -0,0 +1,88 @@
; NOTE: Assertions have been autogenerated by utils/update_test_checks.py UTC_ARGS: --version 5
; RUN: opt -S -passes=instsimplify < %s | FileCheck %s

define double @test_atan_0() {
; CHECK-LABEL: define double @test_atan_0() {
; CHECK-NEXT: ret double 0.000000e+00
;
%result = call double @llvm.atan.f64(double 0.0)
ret double %result
}

define double @test_atan_one() {
; CHECK-LABEL: define double @test_atan_one() {
; CHECK-NEXT: ret double 0x3FE921FB54442D18
;
%res = call double @llvm.atan.f64(double 1.0)
ret double %res
}

define <2 x double> @test_atan_v2() {
; CHECK-LABEL: define <2 x double> @test_atan_v2() {
; CHECK-NEXT: ret <2 x double> zeroinitializer
;
%result = call <2 x double> @llvm.atan.v2f64(<2 x double> zeroinitializer)
ret <2 x double> %result
}

define double @test_atan_neg0() {
; CHECK-LABEL: define double @test_atan_neg0() {
; CHECK-NEXT: ret double -0.000000e+00
;
%res = call double @llvm.atan.f64(double -0.0)
ret double %res
}

define double @test_atan_poison() {
; CHECK-LABEL: define double @test_atan_poison() {
; CHECK-NEXT: [[RES:%.*]] = call double @llvm.atan.f64(double poison)
; CHECK-NEXT: ret double [[RES]]
;
%res = call double @llvm.atan.f64(double poison)
ret double %res
}

define double @test_atan_undef() {
; CHECK-LABEL: define double @test_atan_undef() {
; CHECK-NEXT: [[RES:%.*]] = call double @llvm.atan.f64(double undef)
; CHECK-NEXT: ret double [[RES]]
;
%res = call double @llvm.atan.f64(double undef)
ret double %res
}

define double @test_atan_snan() {
; CHECK-LABEL: define double @test_atan_snan() {
; CHECK-NEXT: [[RES:%.*]] = call double @llvm.atan.f64(double 0x7FF0000000000001)
; CHECK-NEXT: ret double [[RES]]
;
%res = call double @llvm.atan.f64(double 0x7ff0000000000001)
ret double %res
}

define double @test_atan_qnan() {
; CHECK-LABEL: define double @test_atan_qnan() {
; CHECK-NEXT: [[RES:%.*]] = call double @llvm.atan.f64(double 0x7FF8000000000000)
; CHECK-NEXT: ret double [[RES]]
;
%res = call double @llvm.atan.f64(double 0x7ff8000000000000)
ret double %res
}

define double @test_atan_pos_inf() {
; CHECK-LABEL: define double @test_atan_pos_inf() {
; CHECK-NEXT: [[RES:%.*]] = call double @llvm.atan.f64(double 0x7FF0000000000000)
; CHECK-NEXT: ret double [[RES]]
;
%res = call double @llvm.atan.f64(double 0x7ff0000000000000)
ret double %res
}

define double @test_atan_neg_inf() {
; CHECK-LABEL: define double @test_atan_neg_inf() {
; CHECK-NEXT: [[RES:%.*]] = call double @llvm.atan.f64(double 0xFFF0000000000000)
; CHECK-NEXT: ret double [[RES]]
;
%res = call double @llvm.atan.f64(double 0xfff0000000000000)
ret double %res
}
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