On Thu, 3 Mar 2016, Florian Weimer wrote: > Both hardware with amd without avx512f capability. There is run-time > detection for it, but for it to be effective, most of the program has > to be compiled without -mavx512f, otherwise the program will use > avx512f instructions before getting to the detection code. I think separate compilation is the proper tool for this. Your initial message seems to imply you seek another method; why? Thanks. Alexander