Crash when a geometry shader uses the same struct for input and output

[tristanlabelle]

Repro:

struct GSInOut { float value : TEXCOORD0; };

[maxvertexcount(1)]
void main(point GSInOut input[1], inout PointStream<GSInOut> output)
{
    output.Append(input[0]);
}

Call stack:

>	dxcompiler.dll!llvm_assert(const char * _Message, const char * _File, unsigned int _Line, const char * _Function) Line 23	C++
 	dxcompiler.dll!llvm::StoreInst::AssertOK() Line 993	C++
 	dxcompiler.dll!llvm::StoreInst::StoreInst(llvm::Value * val, llvm::Value * addr, bool isVolatile, unsigned int Align, llvm::AtomicOrdering Order, llvm::SynchronizationScope SynchScope, llvm::Instruction * InsertBefore) Line 1037	C++
 	dxcompiler.dll!llvm::StoreInst::StoreInst(llvm::Value * val, llvm::Value * addr, bool isVolatile, unsigned int Align, llvm::Instruction * InsertBefore) Line 1017	C++
 	dxcompiler.dll!llvm::StoreInst::StoreInst(llvm::Value * val, llvm::Value * addr, bool isVolatile, llvm::Instruction * InsertBefore) Line 1008	C++
 	dxcompiler.dll!llvm::IRBuilder<1,llvm::ConstantFolder,llvm::IRBuilderDefaultInserter<1> >::CreateStore(llvm::Value * Val, llvm::Value * Ptr, bool isVolatile) Line 986	C++
 	dxcompiler.dll!SimplePtrCopy(llvm::Value * DestPtr, llvm::Value * SrcPtr, llvm::SmallVector<llvm::Value *,16> & idxList, llvm::IRBuilder<1,llvm::ConstantFolder,llvm::IRBuilderDefaultInserter<1> > & Builder) Line 2200	C++
 	dxcompiler.dll!SimpleCopy(llvm::Value * Dest, llvm::Value * Src, llvm::SmallVector<llvm::Value *,16> & idxList, llvm::IRBuilder<1,llvm::ConstantFolder,llvm::IRBuilderDefaultInserter<1> > & Builder) Line 2225	C++
 	dxcompiler.dll!SplitCpy(llvm::Type * Ty, llvm::Value * Dest, llvm::Value * Src, llvm::SmallVector<llvm::Value *,16> & idxList, llvm::IRBuilder<1,llvm::ConstantFolder,llvm::IRBuilderDefaultInserter<1> > & Builder, const llvm::DataLayout & DL, hlsl::DxilTypeSystem & typeSys, hlsl::DxilFieldAnnotation * fieldAnnotation, const bool bEltMemCpy) Line 2366	C++
 	dxcompiler.dll!SplitCpy(llvm::Type * Ty, llvm::Value * Dest, llvm::Value * Src, llvm::SmallVector<llvm::Value *,16> & idxList, llvm::IRBuilder<1,llvm::ConstantFolder,llvm::IRBuilderDefaultInserter<1> > & Builder, const llvm::DataLayout & DL, hlsl::DxilTypeSystem & typeSys, hlsl::DxilFieldAnnotation * fieldAnnotation, const bool bEltMemCpy) Line 2284	C++
 	dxcompiler.dll!`anonymous namespace'::SROA_Parameter_HLSL::flattenArgument(llvm::Function * F, llvm::Value * Arg, bool bForParam, hlsl::DxilParameterAnnotation & paramAnnotation, std::vector<llvm::Value *,std::allocator<llvm::Value *> > & FlatParamList, std::vector<hlsl::DxilParameterAnnotation,std::allocator<hlsl::DxilParameterAnnotation> > & FlatAnnotationList, llvm::IRBuilder<1,llvm::ConstantFolder,llvm::IRBuilderDefaultInserter<1> > & Builder, llvm::DbgDeclareInst * DDI) Line 5606	C++
 	dxcompiler.dll!`anonymous namespace'::SROA_Parameter_HLSL::createFlattenedFunction(llvm::Function * F) Line 6072	C++
 	dxcompiler.dll!`anonymous namespace'::SROA_Parameter_HLSL::runOnModule(llvm::Module & M) Line 4284	C++

[tristanlabelle]

This is an SROA issue, note that reversing the order of the parameters works around the bug:

void main(inout PointStream<GSInOut> output, point GSInOut input[1])