Re: [PATCH v2] x86: Fix missing __wmemcmp def for disable-multiarch build

Re: [PATCH v2] x86: Fix missing __wmemcmp def for disable-multiarch build

[Sunil Pandey]

On Tue, Apr 19, 2022 at 6:20 PM Noah Goldstein via Libc-alpha
<libc-alpha@sourceware.org> wrote:
>
> On Tue, Apr 19, 2022 at 6:56 PM H.J. Lu <hjl.tools@gmail.com> wrote:
> >
> > On Tue, Apr 19, 2022 at 4:53 PM Noah Goldstein <goldstein.w.n@gmail.com> wrote:
> > >
> > > commit 8804157ad9da39631703b92315460808eac86b0c
> > > Author: Noah Goldstein <goldstein.w.n@gmail.com>
> > > Date:   Fri Apr 15 12:27:59 2022 -0500
> > >
> > >     x86: Optimize memcmp SSE2 in memcmp.S
> > >
> > > Only defined wmemcmp and missed __wmemcmp. This commit fixes that by
> > > defining __wmemcmp and setting wmemcmp as a weak alias to __wmemcmp.
> > >
> > > Both multiarch and disable-multiarch builds succeed and full xchecks
> > > pass.
> > > ---
> > >  sysdeps/x86_64/multiarch/wmemcmp-sse2.S | 8 ++------
> > >  sysdeps/x86_64/wmemcmp.S                | 6 ++++--
> > >  2 files changed, 6 insertions(+), 8 deletions(-)
> > >
> > > diff --git a/sysdeps/x86_64/multiarch/wmemcmp-sse2.S b/sysdeps/x86_64/multiarch/wmemcmp-sse2.S
> > > index 57be1c446e..f09192ed77 100644
> > > --- a/sysdeps/x86_64/multiarch/wmemcmp-sse2.S
> > > +++ b/sysdeps/x86_64/multiarch/wmemcmp-sse2.S
> > > @@ -16,10 +16,6 @@
> > >     License along with the GNU C Library; if not, see
> > >     <https://www.gnu.org/licenses/>.  */
> > >
> > > -#if IS_IN (libc)
> > > -# define MEMCMP        __wmemcmp_sse2
> > > -#else
> > > -# define MEMCMP        wmemcmp
> > > -#endif
> > >  #define USE_AS_WMEMCMP 1
> > > -#include "memcmp-sse2.S"
> > > +#define MEMCMP __wmemcmp_sse2
> > > +#include "../memcmp.S"
> > > diff --git a/sysdeps/x86_64/wmemcmp.S b/sysdeps/x86_64/wmemcmp.S
> > > index 032f389158..8bd3cf80db 100644
> > > --- a/sysdeps/x86_64/wmemcmp.S
> > > +++ b/sysdeps/x86_64/wmemcmp.S
> > > @@ -16,6 +16,8 @@
> > >     License along with the GNU C Library; if not, see
> > >     <https://www.gnu.org/licenses/>.  */
> > >
> > > -#define MEMCMP wmemcmp
> > > +#define MEMCMP __wmemcmp
> > >  #define USE_AS_WMEMCMP 1
> > > -#include "multiarch/memcmp-sse2.S"
> > > +#include "memcmp.S"
> > > +
> > > +weak_alias (__wmemcmp, wmemcmp)
> > > --
> > > 2.25.1
> > >
> >
> > LGTM.
> >
> > Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
> >
> > Thanks.
>
> Thanks pushed.
> >
> > --
> > H.J.

I would like to backport this patch to release branches.
Any comments or objections?

--Sunil