topic Hello Tang, Wei, in Intel® oneAPI Math Kernel Library

Routine to compute A=xy'?

tang__wei — Fri, 27 Mar 2020 17:23:09 GMT

The BLAS Level 2 routine cblas_?ger computes A := alpha*x*y'+ A. Is there a simpler routine that just calculates A := alpha*x*y'?

Setting A=0 offers the same results, but does it provide good performance too? i.e. am I wasting computation in doing the additions?

Hello Tang, Wei,

Ruqiu_C_Intel — Tue, 31 Mar 2020 05:44:39 GMT

Hello Tang, Wei,

MKL only provides A := alpha*x*y'+ A for cblas_?ger. Yes, you can set A=0 to meet your expectation of A := alpha*x*y'. And it has good performance without any performance degradation.

Best Regards,

Ruqiu