jasonmolenda added a comment.

I suppose a possible alternative would be to figure out the avx2 / avx512 
features manually based on the cpuid instead of letting the compiler do it for 
us.  e.g. 
https://stackoverflow.com/questions/1666093/cpuid-implementations-in-c and then 
checking the bits as e.g. described in https://en.wikipedia.org/wiki/CPUID .  
Bummer to do it so low level if we can delegate this to the compiler though.


Repository:
  rL LLVM

https://reviews.llvm.org/D41962



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