topic Re: does ippiDiv works? in Intel® Integrated Performance Primitives

does ippiDiv works?

hk1 — Wed, 01 Feb 2006 18:45:53 GMT

Hi,

I have a problem using ippiDiv_8u_C1RSfs and ippiDiv_8u_C1IRSfs as well. A destination bufferis always filled with zeros, no matter what is a content of source buffers. Even if I use same buffer as src1 and src2, the result of divide is zero filled buffer, but it should be 1's? I tried with many scale factors, including 1, 255, 65535

Thanks

Re: does ippiDiv works?

hk1 — Wed, 01 Feb 2006 18:47:49 GMT

I have tried with IPP4.0 and IPP5.0

Re: does ippiDiv works?

Intel_C_Intel — Thu, 02 Feb 2006 14:59:26 GMT

scalefactor=1 means that the result is multiplied by 2^(-1) ie x/x will be 1>>1=0 (see manual, Volume 1 p 2-11)

Have you tried with scalefactor=0 or scalefactor<0?

Re: does ippiDiv works?

hk1 — Thu, 02 Feb 2006 18:02:43 GMT

Many thanks,

I tried with scalefactor = -8 and it is ok. Result is scaled by 256.

The problem was, that ippi manual doesn't mention it in ippiDiv function description. And in IppiMan.pdf on the page 2-11 thereare status constants descriptions only.

Re: does ippiDiv works?

Intel_C_Intel — Fri, 03 Feb 2006 16:24:19 GMT

I may be wrong with the page number. The paragraph name is "Integer Scaling" or "Integer Result Scaling"