VML complex functions timing

[Shueng_Chuan_Kiu]

Hi,

I was browsing the following page which lists the Clocks Per Element timing for all the VML functions.

http://software.intel.com/sites/products/documentation/hpc/mkl/vml3/functions/_performanceall.html

Does anyone else think the timings for the Complex functions seem suspect?

E.g.

Real Add : 0.79

Complex Add : 19.11

Surely Complex Add should only be 2x slower?

[Ilya_B_Intel]

Complex add/sub functions support FP overflow error handling, while real add/sub functions do not guarantee that. This is the reason for difference in performance.