sizeof VC object

[Matthias Kretz]

[please enable javascript to see the address] wrote:
> A code example is below.  Can someone explain where to research
> code that makes sizeof return these values?

I'm not sure I understand your question. Are you asking why sizeof returns the 
values it returns?

In any case, sizeof(Vector<T>)/sizeof(T) is not guaranteed to be equal to 
Vector<T>::size().

Cheers,
  Matthias

> I am researching because this
> approach does not work with UMESimd.
>  
> I uploaded my extraction from VecGeom to 
> https://github.com/nicholasferguson/Portable_SIMD
>  
> for code below, preprocessor is VECCORE_ENABLE_VC
>  
> ==================== code for file backend.cpp ===================
>  
> #include <VecCore/VecCore>
>  
> int main(int argc, char *argv[])
> {
> using T = Vc_1::Vector<float, struct Vc_1::VectorAbi::Avx>;
> size_t c = sizeof(T);  // c is 32
> size_t t = sizeof(vecCore::Scalar<T>); // t is 4
> size_t VectorSize = c / t;  // VectorSize is 8
>  
> return 0;
> }
> ==================== code ===================
>  
>  
> 
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 Dr. Matthias Kretz                                https://kretzfamily.de
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 SIMD easy and portable                     https://github.com/VcDevel/Vc
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