[PATCH] x86_64: Add sinh with FMA

[Sunil Pandey]

On Wed, Mar 12, 2025 at 4:46 PM H.J. Lu <hjl.tools@gmail.com> wrote:

> On Wed, Mar 12, 2025 at 3:41 PM Sunil K Pandey <skpgkp2@gmail.com> wrote:
> >
> > On Skylake, it improves sinh bench performance by:
> >
> >         Before          After           Improvement
> > max     112.749         84.361          25%
> > min     20.772          21.418          -3%
>
> Why is this slower?  Do you have data on newer machines?
>

My SKX server machine has big run-to-run variation.  Following are the data
from other machines.

SPR:



                  Before          After           Improvement
max         56.49          43.367         23%

Min         10.87            8.344           23%

Mean     12.7086      10.6824      16%





Skylake client:



              Before          After              Improvement

Max     104.207         99.272          4.7%

Min       22.708          20.8235        8%

Mean   27.5725        25.7811        6.4%



>
> > mean    25.5503         24.6861         3%
> > ---
> >  sysdeps/ieee754/dbl-64/e_sinh.c           |  8 ++++++
> >  sysdeps/x86_64/fpu/multiarch/Makefile     |  2 ++
> >  sysdeps/x86_64/fpu/multiarch/e_sinh-fma.c | 12 ++++++++
> >  sysdeps/x86_64/fpu/multiarch/e_sinh.c     | 35 +++++++++++++++++++++++
> >  4 files changed, 57 insertions(+)
> >  create mode 100644 sysdeps/x86_64/fpu/multiarch/e_sinh-fma.c
> >  create mode 100644 sysdeps/x86_64/fpu/multiarch/e_sinh.c
> >
> > diff --git a/sysdeps/ieee754/dbl-64/e_sinh.c
> b/sysdeps/ieee754/dbl-64/e_sinh.c
> > index b4b5857ddd..3f787967f9 100644
> > --- a/sysdeps/ieee754/dbl-64/e_sinh.c
> > +++ b/sysdeps/ieee754/dbl-64/e_sinh.c
> > @@ -41,6 +41,11 @@ static char rcsid[] = "$NetBSD: e_sinh.c,v 1.7
> 1995/05/10 20:46:13 jtc Exp $";
> >
> >  static const double one = 1.0, shuge = 1.0e307;
> >
> > +#ifndef SECTION
> > +# define SECTION
> > +#endif
> > +
> > +SECTION
> >  double
> >  __ieee754_sinh (double x)
> >  {
> > @@ -90,4 +95,7 @@ __ieee754_sinh (double x)
> >    /* |x| > overflowthresold, sinh(x) overflow */
> >    return math_narrow_eval (x * shuge);
> >  }
> > +
> > +#ifndef __ieee754_sinh
> >  libm_alias_finite (__ieee754_sinh, __sinh)
> > +#endif
> > diff --git a/sysdeps/x86_64/fpu/multiarch/Makefile
> b/sysdeps/x86_64/fpu/multiarch/Makefile
> > index e823d2fcc6..d2d96dd089 100644
> > --- a/sysdeps/x86_64/fpu/multiarch/Makefile
> > +++ b/sysdeps/x86_64/fpu/multiarch/Makefile
> > @@ -5,6 +5,7 @@ CFLAGS-e_exp-fma.c = -mfma -mavx2
> >  CFLAGS-e_log-fma.c = -mfma -mavx2
> >  CFLAGS-e_log2-fma.c = -mfma -mavx2
> >  CFLAGS-e_pow-fma.c = -mfma -mavx2
> > +CFLAGS-e_sinh-fma.c = -mfma -mavx2
> >  CFLAGS-s_atan-fma.c = -mfma -mavx2
> >  CFLAGS-s_expm1-fma.c = -mfma -mavx2
> >  CFLAGS-s_log1p-fma.c = -mfma -mavx2
> > @@ -68,6 +69,7 @@ libm-sysdep_routines += \
> >    e_logf-fma \
> >    e_pow-fma \
> >    e_powf-fma \
> > +  e_sinh-fma \
> >    s_atan-avx \
> >    s_atan-fma \
> >    s_ceil-sse4_1 \
> > diff --git a/sysdeps/x86_64/fpu/multiarch/e_sinh-fma.c
> b/sysdeps/x86_64/fpu/multiarch/e_sinh-fma.c
> > new file mode 100644
> > index 0000000000..e0e1e39a7a
> > --- /dev/null
> > +++ b/sysdeps/x86_64/fpu/multiarch/e_sinh-fma.c
> > @@ -0,0 +1,12 @@
> > +#define __ieee754_sinh __ieee754_sinh_fma
> > +#define __ieee754_exp __ieee754_exp_fma
> > +#define __expm1 __expm1_fma
> > +
> > +/* NB: __expm1 may be expanded to __expm1_fma in the following
> > +   prototypes.  */
> > +extern long double __expm1l (long double);
> > +extern long double __expm1f128 (long double);
> > +
> > +#define SECTION __attribute__ ((section (".text.fma")))
> > +
> > +#include <sysdeps/ieee754/dbl-64/e_sinh.c>
> > diff --git a/sysdeps/x86_64/fpu/multiarch/e_sinh.c
> b/sysdeps/x86_64/fpu/multiarch/e_sinh.c
> > new file mode 100644
> > index 0000000000..3d3c18ccdf
> > --- /dev/null
> > +++ b/sysdeps/x86_64/fpu/multiarch/e_sinh.c
> > @@ -0,0 +1,35 @@
> > +/* Multiple versions of sinh.
> > +   Copyright (C) 2025 Free Software Foundation, Inc.
> > +   This file is part of the GNU C Library.
> > +
> > +   The GNU C Library is free software; you can redistribute it and/or
> > +   modify it under the terms of the GNU Lesser General Public
> > +   License as published by the Free Software Foundation; either
> > +   version 2.1 of the License, or (at your option) any later version.
> > +
> > +   The GNU C Library is distributed in the hope that it will be useful,
> > +   but WITHOUT ANY WARRANTY; without even the implied warranty of
> > +   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
> > +   Lesser General Public License for more details.
> > +
> > +   You should have received a copy of the GNU Lesser General Public
> > +   License along with the GNU C Library; if not, see
> > +   <https://www.gnu.org/licenses/>.  */
> > +
> > +#include <sysdeps/x86/isa-level.h>
> > +#if MINIMUM_X86_ISA_LEVEL < AVX2_X86_ISA_LEVEL
> > +# include <libm-alias-finite.h>
> > +
> > +extern double __redirect_ieee754_sinh (double);
> > +
> > +# define SYMBOL_NAME ieee754_sinh
> > +# include "ifunc-fma.h"
> > +
> > +libc_ifunc_redirected (__redirect_ieee754_sinh, __ieee754_sinh,
> > +                      IFUNC_SELECTOR ());
> > +
> > +libm_alias_finite (__ieee754_sinh, __sinh)
> > +
> > +# define __ieee754_sinh __ieee754_sinh_sse2
> > +#endif
> > +#include <sysdeps/ieee754/dbl-64/e_sinh.c>
> > --
> > 2.48.1
> >
>
>
> --
> H.J.
>
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