[PATCH, AARCH64] Optimized memset

[Wilco Dijkstra]

> Wilco Dijkstra wrote:
> > Marcus Shawcroft wrote:
> > On 10 July 2015 at 13:44, Wilco Dijkstra <wdijkstr@arm.com> wrote:
> >
> > > It turns out to be slightly faster on A53 too, so I've updated my patch.
> > >
> > > Wilco
> > >
> > > ChangeLog:
> > > 2015-07-10  Wilco Dijkstra  <wdijkstr@arm.com>
> > >
> > >         * newlib/libc/machine/aarch64/memset.S (memset):
> > >         Rewrite of optimized memset.
> > >
> > > OK for commit?
> >
> > Wilco, This patch appears to cause various aarch64_be-none-elf gcc
> > testsuite tests to drop into infinite loops. One example is:
> >
> > RUNTESTFLAGS="builtins.exp=fprintf.c" make check-gcc
> >
> > would you mind investigating please?
> >
> > I'm going to revert the patch while we investigate this.
> 
> It turns out there was a typo in this instruction due to testing for
> different zva values:
> 
> 	and	tmp1w, tmp1w, 4 (should be 15)
> 
> As a result memset fails if you use a dz zva value other than the
> common setting of 64 bytes. With the change it correctly works with
> any legal setting, and aarch64_be-none-elf passes.
> 
> Attached is the fixed version of the patch.

Marcus, could you check the new version in please?

Wilco