[PATCH v2] x86-64: AVX2 Optimize strcat/strcpy/stpcpy routines

[Florian Weimer]

* leonardo sandoval gonzalez:

> Optimize strcat/strcpy/stpcpy routines and its max-offset versions with
> AVX2. It uses vector comparison as much as possible. Observed speedups
> compared to sse2_unaligned:

Shouldn't we keep the stpcpy specialization from the original patch?  Or
at least call the new strcpy from a wrapper function?  The generic
function uses strlen plus memcpy, which I believe is slower than calling
strcpy and recomputing the return value.

How does this new strcpy compare against the old one for short strings?

Thanks,
Florian