topic memset / ippsZero in Intel® Integrated Performance Primitives

memset / ippsZero

khalouda — Wed, 12 Oct 2005 05:04:22 GMT

hi all,

i use memset to initialize structures , for example

if i have an instance of a structure named struct1

i usually write

memset(&struct1,0,sizeof(someStructure));

if i want to do the same using IPP

i tried

ippsZero_8u ( (Ipp8u*) &struct1,sizeof(someStructure));

is this the optimal way ?

i mean if there is a direct way to pass the structure pointer instead of accessing it byte by byte

Re: memset / ippsZero

Vladimir_Dudnik — Mon, 17 Oct 2005 22:55:43 GMT

Hi,

The function ippsZero_8u is dedicated to work with vector of Ipp8u values, so it was declared in ipps.h as:

IPPAPI ( IppStatus, ippsZero_8u,( Ipp8u* pDst, int len ))

and though, you have to provide pointer to Ipp8u vector. But this does not mean that function will do their work just accessing byte-by-byte. On systems with SIMD instructions available it will perform vectorization inside.

Regards,
Vladimir