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

[H.J. Lu]

On Sun, Jun 11, 2017 at 12:46 PM, H.J. Lu <hjl.tools@gmail.com> wrote:
> 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.
>>

Here is the patch with updated commit message.  I also renamed
ifunc-strcpy.h to ifunc-unaligned-ssse3.h so that it can be used for
strcat.

Any other comments?

-- 
H.J.
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