Agner`s CPU blog

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Still no library that is optimal on all processors
Author: Agner Date: 2012-05-17 13:40
Guest wrote:
does anyone have any news on whether Intel has any intention of removing the performance throttle against AMD?
It's not getting better. The latest version of Intel's SVML (small vector math library) has some functions that can only be called from processors with AVX because the input parameter is an AVX vector (YMM register). There is no logical reason why these functions should have a CPU dispatcher, yet they have two different code paths for the same instruction set: An optimized version for Intel processors with AVX and an inferior version for other brands of CPU with AVX.
 
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