DirectXShaderCompiler/tools/clang/test/CodeGenSPIRV/empty-struct-interface.vs.hlsl2spv

// Run: %dxc -T vs_6_0 -E main

// There is no interface variable for VSIn or VSOut empty structs (See OpEntryPoint below).

struct VSIn {};

struct VSOut {};

VSOut main(VSIn input)
{
  VSOut result;
  return result;
}

// CHECK-WHOLE-SPIR-V:
// OpCapability Shader
// OpMemoryModel Logical GLSL450
// OpEntryPoint Vertex %main "main" %gl_PerVertexOut
// OpName %bb_entry "bb.entry"
// OpName %src_main "src.main"
// OpName %main "main"
// OpName %type_gl_PerVertex "type.gl_PerVertex"
// OpName %gl_PerVertexOut "gl_PerVertexOut"
// OpName %VSIn "VSIn"
// OpName %param_var_input "param.var.input"
// OpName %input "input"
// OpName %result "result"
// OpMemberDecorate %type_gl_PerVertex 0 BuiltIn Position
// OpMemberDecorate %type_gl_PerVertex 1 BuiltIn PointSize
// OpMemberDecorate %type_gl_PerVertex 2 BuiltIn ClipDistance
// OpMemberDecorate %type_gl_PerVertex 3 BuiltIn CullDistance
// OpDecorate %type_gl_PerVertex Block
// %void = OpTypeVoid
// %3 = OpTypeFunction %void
// %float = OpTypeFloat 32
// %v4float = OpTypeVector %float 4
// %uint = OpTypeInt 32 0
// %uint_1 = OpConstant %uint 1
// %_arr_float_uint_1 = OpTypeArray %float %uint_1
// %type_gl_PerVertex = OpTypeStruct %v4float %float %_arr_float_uint_1 %_arr_float_uint_1
// %_ptr_Output_type_gl_PerVertex = OpTypePointer Output %type_gl_PerVertex
// %VSIn = OpTypeStruct
// %_ptr_Function_VSIn = OpTypePointer Function %VSIn
// %19 = OpTypeFunction %VSIn %_ptr_Function_VSIn
// %gl_PerVertexOut = OpVariable %_ptr_Output_type_gl_PerVertex Output
// %main = OpFunction %void None %3
// %13 = OpLabel
// %param_var_input = OpVariable %_ptr_Function_VSIn Function
// %17 = OpCompositeConstruct %VSIn
// OpStore %param_var_input %17
// %18 = OpFunctionCall %VSIn %src_main %param_var_input
// OpReturn
// OpFunctionEnd
// %src_main = OpFunction %VSIn None %19
// %input = OpFunctionParameter %_ptr_Function_VSIn
// %bb_entry = OpLabel
// %result = OpVariable %_ptr_Function_VSIn Function
// %23 = OpLoad %VSIn %result
// OpReturnValue %23
// OpFunctionEnd