[clang] [llvm] Add step builtins and step HLSL function to DirectX and SPIR-V backend (PR #106471)

[Justin Bogner via cfe-commits]

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@@ -0,0 +1,33 @@
+; RUN: llc -O0 -mtriple=spirv-unknown-unknown %s -o - | FileCheck %s
+; RUN: %if spirv-tools %{ llc -O0 -mtriple=spirv-unknown-unknown %s -o - -filetype=obj | spirv-val %}
+
+; Make sure SPIRV operation function calls for step are lowered correctly.
+
+; CHECK-DAG: %[[#op_ext_glsl:]] = OpExtInstImport "GLSL.std.450"
+; CHECK-DAG: %[[#float_32:]] = OpTypeFloat 32
+; CHECK-DAG: %[[#float_16:]] = OpTypeFloat 16
+; CHECK-DAG: %[[#vec4_float_16:]] = OpTypeVector %[[#float_16]] 4
+; CHECK-DAG: %[[#vec4_float_32:]] = OpTypeVector %[[#float_32]] 4
+
+define noundef <4 x half> @step_half4(<4 x half> noundef %a, <4 x half> noundef %b) {
+entry:
+  ; CHECK: %[[#]] = OpFunction %[[#vec4_float_16]] None %[[#]]
+  ; CHECK: %[[#arg0:]] = OpFunctionParameter %[[#vec4_float_16]]
+  ; CHECK: %[[#arg1:]] = OpFunctionParameter %[[#vec4_float_16]]
+  ; CHECK: %[[#]] = OpExtInst %[[#vec4_float_16]] %[[#op_ext_glsl]] Step %[[#arg0]] %[[#arg1]]
+  %hlsl.step = call <4 x half> @llvm.spv.step.v4f16(<4 x half> %a, <4 x half> %b)
+  ret <4 x half> %hlsl.step
+}
+
+define noundef <4 x float> @step_float4(<4 x float> noundef %a, <4 x float> noundef %b) {
+entry:
+  ; CHECK: %[[#]] = OpFunction %[[#vec4_float_32]] None %[[#]]
+  ; CHECK: %[[#arg0:]] = OpFunctionParameter %[[#vec4_float_32]]
+  ; CHECK: %[[#arg1:]] = OpFunctionParameter %[[#vec4_float_32]]
+  ; CHECK: %[[#]] = OpExtInst %[[#vec4_float_32]] %[[#op_ext_glsl]] Step %[[#arg0]] %[[#arg1]]
+  %hlsl.step = call <4 x float> @llvm.spv.step.v4f32(<4 x float> %a, <4 x float> %b)
+  ret <4 x float> %hlsl.step
+}
+
+declare <4 x half> @llvm.spv.step.v4f16(<4 x half>, <4 x half>)
+declare <4 x float> @llvm.spv.step.v4f32(<4 x float>, <4 x float>)
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bogner wrote:

Please add a newline at the end of the file

https://github.com/llvm/llvm-project/pull/106471