I'm facing the below error when trying to use PackUnsigned with Short8 - PLEASE HELP

[podeti vishal]

PackUnsigned for Short8 Reactor Types

Hi All,
I'm facing the below error when trying to use PackUnsigned with Short8

swiftshader/third_party/llvm-10.0/llvm/lib/IR/Instructions.cpp:400:
void llvm::CallInst::init(llvm::FunctionType*, llvm::Value*, llvm::ArrayRef<llvm::Value*>, llvm::ArrayRef<llvm::OperandBundleDefT<llvm::Value*> >, const llvm::Twine&):
 Assertion `(i >= FTy->getNumParams() || FTy->getParamType(i) == Args[i]->getType()) && "Calling a function with a bad signature!"' failed.
 
The underlying function which PackUnsigned is calling (packuswb_avx2) is as below :

RValue<Byte16> packuswb_avx2(RValue<Short8> x, RValue<Short8> y)
{
        llvm::Function *packuswb = llvm::Intrinsic::getDeclaration(jit->module.get(), llvm::Intrinsic::x86_avx2_packuswb);
        //RValue<Short8> dest = Short8();
        //Value* v =  V(jit->builder->CreateCall3(packuswb, ARGS(V(dest.value), V(x.value), V(y.value))));
        return As<Byte16>(V(jit->builder->CreateCall2(packuswb, ARGS(V(x.value), V(y.value)))));
}

        current.z = As<Short8>(PackUnsigned(current.x, current.z));
        current.y = As<Short8>(PackUnsigned(current.y, current.y));

Can anyone please help ?

[Alexis Hétu]

Are you running this on AVX2 capable hardware?

https://en.wikipedia.org/wiki/Advanced_Vector_Extensions#CPUs_with_AVX2

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[podeti vishal]

Thanks alexis for the reply. 

My host machine supports avx2. 

I checked it with cat /proc/cpuinfo | grep avx2

[podeti vishal]

The error was due to type mismatch of data types when using the x86_avx2_packuswb. 

This instruction (https://www.felixcloutier.com/x86/packuswb) expects v16_i16 as input types. 

Calling this intrinsic with Short8 Reactor Type whose type is v8_i16 caused the 'calling function with bad signature' 

error.  

Thanks :)