Should we compile x86-64 ld.so with -mno-sse -mno-sse?

[Ondrej Bilka]

On Wed, Oct 31, 2012 at 04:18:10PM -0700, H.J. Lu wrote:
> On Wed, Oct 31, 2012 at 3:59 PM, Richard Henderson <rth@twiddle.net> wrote:
> > On 2012-11-01 03:10, Carlos O'Donell wrote:
> >> What use case is there for not wanting to touch SEE in ld.so?
> >
> > I can only imagine HJL is worried about AVX performance if the
> > dynamic linker uses SSE insns.
> >
> 
> That is not the main reason.  We make sure that ld.so string/memory
> functions never touch SSE/AVX registers.  It is not for performance,
> but for correctness.  Otherwise callee will get random values in
> vector registers,

Or we can save and restore used xmm registers or I am missing something?
> 
> -- 
> H.J.