[PATCH] Don't write beyond destination in __mempcpy_avx512_no_vzeroupper (bug 23196)

[H.J. Lu]

On Tue, May 22, 2018 at 5:38 AM, Andreas Schwab <schwab@suse.de> wrote:
> On Mai 22 2018, "H.J. Lu" <hjl.tools@gmail.com> wrote:
>
>> It should also fail without the fix.
>
> Again, tell me how to do that.

You need to trigger this condition on all AVX512 machines.

>> __mempcpy_avx512_no_vzeroupper can be implemented with
>> memmove-vec-unaligned-erms.S.
>
> In which way?  There is no definition of __mempcpy_avx512_no_vzeroupper
> in memmove-vec-unaligned-erms.S.
>

memmove-vec-unaligned-erms.S is a template.  It can be used to
implement AVX512 memmove without vzeroupper.


-- 
H.J.