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There are several benchmarks out there showing that the Intel compiler can give a boost for AMD chips over MS VC++ and MingG++ on Windows.

They should have originally used supported flags for different features instead of blacklisting the name, but it's still difficult to know what chips support what and whether it's worth using those features, due to different instruction latency, etc.

ICC get register dynamic code switching to different paths in the exe, so that if the chip supports AVX2, it'll use that code path.



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