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Re:Hand-Coded Assembly Beats Intrinsics in Speed and Simplicity by nteon on Tuesday August 11, 2015 @04:18PM (#10044062)
for an example, checkout this: http://pasky.or.cz/dev/glibc/ifunc.c

Two implementations are compiled (one is optimized using instructions only available on certain processors), and the decision of which one to use is made at program startup.

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