               OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint Vertex %main "main" %3 %pos
               OpName %sk_PerVertex "sk_PerVertex"
               OpMemberName %sk_PerVertex 0 "sk_Position"
               OpMemberName %sk_PerVertex 1 "sk_PointSize"
               OpName %pos "pos"
               OpName %main "main"
               OpMemberDecorate %sk_PerVertex 0 BuiltIn Position
               OpMemberDecorate %sk_PerVertex 1 BuiltIn PointSize
               OpDecorate %sk_PerVertex Block
               OpDecorate %pos Location 0
      %float = OpTypeFloat 32
    %v4float = OpTypeVector %float 4
%sk_PerVertex = OpTypeStruct %v4float %float
%_ptr_Output_sk_PerVertex = OpTypePointer Output %sk_PerVertex
          %3 = OpVariable %_ptr_Output_sk_PerVertex Output
%_ptr_Input_v4float = OpTypePointer Input %v4float
        %pos = OpVariable %_ptr_Input_v4float Input
       %void = OpTypeVoid
         %11 = OpTypeFunction %void
        %int = OpTypeInt 32 1
      %int_0 = OpConstant %int 0
%_ptr_Output_v4float = OpTypePointer Output %v4float
       %main = OpFunction %void None %11
         %12 = OpLabel
         %13 = OpLoad %v4float %pos
         %16 = OpAccessChain %_ptr_Output_v4float %3 %int_0
               OpStore %16 %13
               OpReturn
               OpFunctionEnd
