dawn-cmake/test/shader_io/invariant_struct_member.wgs...

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; SPIR-V
; Version: 1.3
; Generator: Google Tint Compiler; 0
; Bound: 22
; Schema: 0
OpCapability Shader
OpMemoryModel Logical GLSL450
OpEntryPoint Vertex %main "main" %tint_pointsize %tint_symbol_1
OpName %tint_pointsize "tint_pointsize"
OpName %tint_symbol_1 "tint_symbol_1"
OpName %Out "Out"
OpMemberName %Out 0 "pos"
OpName %tint_symbol_2 "tint_symbol_2"
OpName %tint_symbol "tint_symbol"
OpName %main "main"
OpDecorate %tint_pointsize BuiltIn PointSize
OpDecorate %tint_symbol_1 BuiltIn Position
OpDecorate %tint_symbol_1 Invariant
OpMemberDecorate %Out 0 Offset 0
%float = OpTypeFloat 32
%_ptr_Output_float = OpTypePointer Output %float
%4 = OpConstantNull %float
%tint_pointsize = OpVariable %_ptr_Output_float Output %4
%v4float = OpTypeVector %float 4
%_ptr_Output_v4float = OpTypePointer Output %v4float
%8 = OpConstantNull %v4float
%tint_symbol_1 = OpVariable %_ptr_Output_v4float Output %8
%void = OpTypeVoid
%Out = OpTypeStruct %v4float
%9 = OpTypeFunction %void %Out
%16 = OpTypeFunction %void
%float_1 = OpConstant %float 1
%21 = OpConstantNull %Out
%tint_symbol_2 = OpFunction %void None %9
%tint_symbol = OpFunctionParameter %Out
%14 = OpLabel
%15 = OpCompositeExtract %v4float %tint_symbol 0
OpStore %tint_symbol_1 %15
OpReturn
OpFunctionEnd
%main = OpFunction %void None %16
%18 = OpLabel
OpStore %tint_pointsize %float_1
%20 = OpFunctionCall %void %tint_symbol_2 %21
OpReturn
OpFunctionEnd