[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 +1,100 @@
+// 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,DXIL_CHECK,DXIL_NATIVE_HALF,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,DXIL_CHECK,NO_HALF,DXIL_NO_HALF
+// RUN: %clang_cc1 -finclude-default-header -x hlsl -triple \
+// RUN:   spirv-unknown-vulkan-compute %s -fnative-half-type \
+// RUN:   -emit-llvm -disable-llvm-passes -o - | FileCheck %s \
+// RUN:   --check-prefixes=CHECK,NATIVE_HALF,SPIR_NATIVE_HALF,SPIR_CHECK
+// RUN: %clang_cc1 -finclude-default-header -x hlsl -triple \
+// RUN:   spirv-unknown-vulkan-compute %s -emit-llvm -disable-llvm-passes \
+// RUN:   -o - | FileCheck %s --check-prefixes=CHECK,NO_HALF,SPIR_NO_HALF,SPIR_CHECK
+
+// DXIL_NATIVE_HALF: define noundef half @
+// SPIR_NATIVE_HALF: define spir_func noundef half @
+// DXIL_NATIVE_HALF: call half @llvm.dx.step.f16(half
+// SPIR_NATIVE_HALF: call half @llvm.spv.step.f16(half
+// DXIL_NO_HALF: call float @llvm.dx.step.f32(float
+// SPIR_NO_HALF: call float @llvm.spv.step.f32(float
+// NATIVE_HALF: ret half
+// NO_HALF: ret float
+half test_step_half(half p0, half p1)
+{
+    return step(p0, p1);
+}
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bogner wrote:

The in-tree builtin tests were updated recently to clean up a bunch of the differences between DXIL and SPIRV (See #105930). Could you please update this test to that newer style?

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