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Then I also thought of handling something like <= 16 .. 32 sizes inline and the rest in a deeper never_inline function. This would probably improve the situation without adding so much complexity.

In the trunk now... >=16 now handled by non-inline function. There is impact in your benchmark (the one that runs for all sizes), less impact in my benchmark (with ransom sizes), but I think this is the right move...

Another benefit is that we can now consider using AVX (testing for AVX presence would be clumsy in inline function I think).

Mirek