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[DirectX] scalarize the dx.isinf intrinsic #140638

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Merged
merged 1 commit into from
May 20, 2025
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[DirectX] scalarize the dx.isinf intrinsic #140638

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2 changes: 2 additions & 0 deletions llvm/lib/Target/DirectX/DirectXTargetTransformInfo.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -29,6 +29,7 @@ bool DirectXTTIImpl::isTargetIntrinsicWithOverloadTypeAtArg(Intrinsic::ID ID,
int OpdIdx) const {
switch (ID) {
case Intrinsic::dx_asdouble:
case Intrinsic::dx_isinf:
return OpdIdx == 0;
default:
return OpdIdx == -1;
Expand All @@ -43,6 +44,7 @@ bool DirectXTTIImpl::isTargetIntrinsicTriviallyScalarizable(
case Intrinsic::dx_firstbitshigh:
case Intrinsic::dx_firstbituhigh:
case Intrinsic::dx_frac:
case Intrinsic::dx_isinf:
case Intrinsic::dx_rsqrt:
case Intrinsic::dx_saturate:
case Intrinsic::dx_splitdouble:
Expand Down
24 changes: 20 additions & 4 deletions llvm/test/CodeGen/DirectX/isinf.ll
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Original file line number Diff line number Diff line change
@@ -1,4 +1,4 @@
; RUN: opt -S -dxil-op-lower -mtriple=dxil-pc-shadermodel6.3-library %s | FileCheck %s
; RUN: opt -S -scalarizer -dxil-op-lower -mtriple=dxil-pc-shadermodel6.3-library %s | FileCheck %s

; Make sure dxil operation function calls for isinf are generated for float and half.

Expand All @@ -16,7 +16,23 @@ entry:
ret i1 %dx.isinf
}

; CHECK: attributes #[[#ATTR]] = {{{.*}} memory(none) {{.*}}}
define noundef <4 x i1> @isinf_half4(<4 x half> noundef %p0) {
entry:
; CHECK: call i1 @dx.op.isSpecialFloat.f16(i32 9, half
; CHECK: call i1 @dx.op.isSpecialFloat.f16(i32 9, half
; CHECK: call i1 @dx.op.isSpecialFloat.f16(i32 9, half
; CHECK: call i1 @dx.op.isSpecialFloat.f16(i32 9, half
%hlsl.isinf = call <4 x i1> @llvm.dx.isinf.v4f16(<4 x half> %p0)
ret <4 x i1> %hlsl.isinf
}

declare i1 @llvm.dx.isinf.f16(half)
declare i1 @llvm.dx.isinf.f32(float)
define noundef <3 x i1> @isinf_float3(<3 x float> noundef %p0) {
entry:
; CHECK: call i1 @dx.op.isSpecialFloat.f32(i32 9, float
; CHECK: call i1 @dx.op.isSpecialFloat.f32(i32 9, float
; CHECK: call i1 @dx.op.isSpecialFloat.f32(i32 9, float
%hlsl.isinf = call <3 x i1> @llvm.dx.isinf.v3f32(<3 x float> %p0)
ret <3 x i1> %hlsl.isinf
}

; CHECK: attributes #[[#ATTR]] = {{{.*}} memory(none) {{.*}}}