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VML complex functions timing

Shueng_Chuan_Kiu
Beginner
‎01-31-2011 10:58 PM
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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?
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Ilya_B_Intel
Employee
‎02-01-2011 03:42 AM
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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.
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