uchar4 doct product

[Aadrien]

I have two uchar4 struct : A and B.

Is there an instruction such that :
int res = dotProd(A,B )

or do I have to cast each field to int and then sum it :
int res = 0;
int ax = (int) a.x;
int bx = (int) b.x;
res += ax*bx;
…

thanks much

[alex_dubinsky]

I have two uchar4 struct : A and B.

Is there an instruction such that :

int res = dotProd(A,B )

or do I have to cast each field to int and then sum it :

int res = 0;

int ax = (int) a.x;

int bx = (int) b.x;

res += ax*bx;

…

thanks much

[snapback]445525[/snapback]

I think on a hardware level it’ll all be the same. CUDA registers are all scalar and 32 bit.