svn commit: r323329 - head/sys/sys

[Ngie Cooper (yaneurabeya)]

> On Sep 8, 2017, at 13:09, Mateusz Guzik <mjg at FreeBSD.org> wrote:
> 
> Author: mjg
> Date: Fri Sep  8 20:09:14 2017
> New Revision: 323329
> URL: https://svnweb.freebsd.org/changeset/base/323329
> 
> Log:
>  Allow __builtin_memset instead of bzero for small buffers of known size
> 
>  In particular this eliminates function calls and related register save/restore
>  when only few writes would suffice.
> 
>  Example speed up can be seen in a fstat microbenchmark on AMD Ryzen cpus, where
>  the throughput went up by ~4.5%.
> 
>  Thanks to cem@ for benchmarking and reviewing the patch.

This change breaks all platforms that use gcc. If it’s not reverted in the next 3 hours, I’ll revert it.

Please fix ASAP if possible: https://ci.freebsd.org/job/FreeBSD-head-riscv64-build/3668/console .

Thanks,
-Ngie
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