[clang] [llvm] Add length HLSL function to DirectX Backend (PR #101256)

[Farzon Lotfi via llvm-commits]

================
@@ -0,0 +1,73 @@
+// RUN: %clang_cc1 -finclude-default-header -x hlsl -triple \
+// RUN:   dxil-pc-shadermodel6.3-library %s -fnative-half-type \
+// RUN:   -emit-llvm -disable-llvm-passes -o - | FileCheck %s \ 
+// RUN:   --check-prefixes=CHECK,NATIVE_HALF
+// RUN: %clang_cc1 -finclude-default-header -x hlsl -triple \
+// RUN:   dxil-pc-shadermodel6.3-library %s -emit-llvm -disable-llvm-passes \
+// RUN:   -o - | FileCheck %s --check-prefixes=CHECK,NO_HALF
+
+// NATIVE_HALF: define noundef half @
+// NATIVE_HALF: call half @llvm.fabs.f16(half
+// NO_HALF: call float @llvm.fabs.f32(float
+// NATIVE_HALF: ret half
+// NO_HALF: ret float
+half test_length_half(half p0)
+{
+	return length(p0);
+}
+// NATIVE_HALF: define noundef half @
+// NATIVE_HALF: %hlsl.length = call half @llvm.dx.length.v2f16
+// NO_HALF: %hlsl.length = call float @llvm.dx.length.v2f32(
+// NATIVE_HALF: ret half %hlsl.length
+// NO_HALF: ret float %hlsl.length
+half test_length_half2(half2 p0)
+{
+	return length(p0);
+}
+// NATIVE_HALF: define noundef half @
+// NATIVE_HALF: %hlsl.length = call half @llvm.dx.length.v3f16
+// NO_HALF: %hlsl.length = call float @llvm.dx.length.v3f32(
+// NATIVE_HALF: ret half %hlsl.length
+// NO_HALF: ret float %hlsl.length
+half test_length_half3(half3 p0)
+{
+	return length(p0);
+}
+// NATIVE_HALF: define noundef half @
+// NATIVE_HALF: %hlsl.length = call half @llvm.dx.length.v4f16
+// NO_HALF: %hlsl.length = call float @llvm.dx.length.v4f32(
+// NATIVE_HALF: ret half %hlsl.length
+// NO_HALF: ret float %hlsl.length
+half test_length_half4(half4 p0)
+{
+	return length(p0);
+}
+
+// CHECK: define noundef float @
+// CHECK: call float @llvm.fabs.f32(float
+// CHECK: ret float
+float test_length_float(float p0)
+{
+	return length(p0);
+}
+// CHECK: define noundef float @
+// CHECK: %hlsl.length = call float @llvm.dx.length.v2f32(
+// CHECK: ret float %hlsl.length
+float test_length_float2(float2 p0)
+{
+	return length(p0);
+}
+// CHECK: define noundef float @
+// CHECK: %hlsl.length = call float @llvm.dx.length.v3f32(
+// CHECK: ret float %hlsl.length
+float test_length_float3(float3 p0)
+{
+	return length(p0);
+}
+// CHECK: define noundef float @
+// CHECK: %hlsl.length = call float @llvm.dx.length.v4f32(
+// CHECK: ret float %hlsl.length
+float test_length_float4(float4 p0)
+{
+	return length(p0);
+}
----------------
farzonl wrote:

add new line at end

https://github.com/llvm/llvm-project/pull/101256