================
@@ -0,0 +1,25 @@
+// RUN: %clang_cc1 -triple dxil-pc-shadermodel6.8-vertex -x hlsl -emit-llvm
-finclude-default-header -disable-llvm-passes -o - %s | FileCheck
--check-prefix=CHECK-DXIL %s
+// RUN: %clang_cc1 -triple spirv-pc-vulkan1.3-vertex -x hlsl -emit-llvm
-finclude-default-header -disable-llvm-passes -o - %s | FileCheck
--check-prefix=CHECK-SPIRV %s
+
+// CHECK-SPIRV: @SV_StartVertexLocation = external hidden thread_local
addrspace(7) externally_initialized constant i32, !spirv.Decorations ![[#MD_0:]]
+
+// The start vertex is read with a dedicated operation and is not part of the
+// input signature, so the user input that follows keeps signature element 0.
+
+// CHECK-DXIL-LABEL: define void @main()
+// CHECK-DXIL: %[[START:.*]] = call i32 @llvm.dx.start.vertex.location()
+// CHECK-DXIL: %[[POS:.*]] = call <4 x float> @llvm.dx.load.input.v4f32(i32 0,
i32 0, i8 0, i32 poison)
+// CHECK-DXIL: call <4 x float> @_Z4mainiDv4_f(i32 %[[START]], <4 x float>
%[[POS]])
+// CHECK-DXIL-NOT: !"SV_StartVertexLocation"
+
+// CHECK-SPIRV-LABEL: define void @main()
+// CHECK-SPIRV: %[[START:.*]] = load i32, ptr addrspace(7)
@SV_StartVertexLocation, align 4
+// CHECK-SPIRV: call spir_func <4 x float> @_Z4mainiDv4_f(i32 %[[START]],
+float4 main(int start : SV_StartVertexLocation, float4 pos : POSITION) :
SV_Position {
+ return pos + start;
+}
+
+// CHECK-SPIRV-DAG: ![[#MD_0]] = !{![[#MD_1:]]}
+// CHECK-SPIRV-DAG: ![[#MD_1]] = !{i32 11, i32 4424}
+// | `-> BuiltIn BaseVertex
+// `-> SPIR-V decoration 'BuiltIn'
----------------
joaosaffran wrote:
nit:
```suggestion
// The metadata bellow contains, BuiltIn BaseVertex followed by
// SPIR-V decoration 'BuiltIn'
// CHECK-SPIRV-DAG: ![[#MD_1]] = !{i32 11, i32 4424}
```
https://github.com/llvm/llvm-project/pull/235831
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