OpCapability Shader
          %1 = OpExtInstImport "GLSL.std.450"
               OpMemoryModel Logical GLSL450
               OpEntryPoint GLCompute %main "main"
               OpExecutionMode %main LocalSize 1 1 1
               OpSource GLSL 450
               OpName %main "main"
               OpDecorate %7 SpecId 3
               OpDecorate %8 SpecId 4
               OpDecorate %gl_WorkGroupSize BuiltIn WorkgroupSize
       %void = OpTypeVoid
          %3 = OpTypeFunction %void
       %uint = OpTypeInt 32 0
          %7 = OpSpecConstant %uint 2048
          %8 = OpSpecConstant %uint 1
     %uint_1 = OpConstant %uint 1
     %v3uint = OpTypeVector %uint 3
%gl_WorkGroupSize = OpSpecConstantComposite %v3uint %7 %8 %uint_1
       %main = OpFunction %void None %3
          %5 = OpLabel
               OpReturn
               OpFunctionEnd