[PATCH] x86-64: Implement strcpy family IFUNC selectors in C

[H.J. Lu]

On Sun, Jun 11, 2017 at 11:22 AM, Florian Weimer
<fweimer@gapps.redhat.com> wrote:
> On 06/11/2017 03:50 PM, H.J. Lu wrote:
>>
>> All internal calls within libc.so can use IFUNC on x86-64 since unlike
>> x86, x86-64 doesn't need to reserve a register to make a PLT call.
>
>
> Shouldn't this rather say, “because, unlike x86, x86-64 supports PC-relative
> addressing to access the GOT entry”?  That's probably the root cause of the

Both are true.  The end result is there is no extra needed for call
via PLT.

> performance difference.
>
> Thanks,
> Florian



-- 
H.J.