Agner`s CPU blog

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New Intel compiler version - still the same!
Author: Daniel Date: 2011-12-23 12:33
First of all I want to thank you for all your research an work coding a fair dispatcher override concerning Intel's Compiler. Without your work this Compiler wouldn't be usable for me at all because code that favorizes Intel CPU's is inacceptable for me!

I'd like to add, that in version 12 of Intel's C++ Compiler for Windows your dispatcher override code works for 32bit, but not for 64bit. Seems like the x64 equivalent for AVX is smaller than the 32bit number.

Adding a simple switch for 64bit and changing the the value at the line __intel_cpu_indicator = 0x20000; from 0x20000 to 1<<16 for the 64bit branch solves the problem. I'm not sure whether the other values are correct or not because the only AMD CPU I have available supports AVX.

The Code vor the MKL and VML are fine though.

Regards
Daniel

 
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