[Bug libc/19759] mempcpy shouldn't be inlined

["carlos at redhat dot com" <sourceware-bugzilla at sourceware dot org>]

https://sourceware.org/bugzilla/show_bug.cgi?id=19759

--- Comment #2 from Carlos O'Donell <carlos at redhat dot com> ---
(In reply to Carlos O'Donell from comment #1)
> I believe this issue should also extend to the following arches which have
> optimized mempcpy and would benefit from the compiler optimization which
> reduces register pressure.
> 
> * i386/i586/i686
> * ppc32/ppc64
> 
> For s390 we need an optimized mempcpy to be implemented to gain back that
> callee saved register before we disable the inlining. For s390 I've filed
> bug 19765 and asked Stefan Liebler (IBM) to review.

So for ppc3 and ppc64 the __builtin_mempcpy is not optimal.

   0:   38 a0 00 20     li      r5,32
   4:   48 00 00 00     b       4 <foo+0x4>
                        4: R_PPC_REL24  mempcpy
   8:   60 00 00 00     nop
   c:   60 42 00 00     ori     r2,r2,0

It doesn't inline the implementation, even at -O3. So it looks like only x86
needs changing.

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