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x86_64: Add tanh with FMA

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On Skylake, it improves tanh bench performance by:

	Before 		After 		Improvement
max	110.89		95.826		14%
min	20.966		20.157		4%
mean	30.9601		29.8431		4%

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>
(cherry picked from commit c6352111c72a20b3588ae304dd99b63e25dd6d85)
This commit is contained in:
Sunil K Pandey 2025-03-10 10:24:07 -07:00
parent ce9b765522
commit 6a3a4a5e58
4 changed files with 49 additions and 0 deletions
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5
sysdeps/ieee754/dbl-64/s_tanh.c
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@ -46,6 +46,11 @@ static char rcsid[] = "$NetBSD: s_tanh.c,v 1.7 1995/05/10 20:48:22 jtc Exp $";
static const double one = 1.0, two = 2.0, tiny = 1.0e-300;
#ifndef SECTION
# define SECTION
#endif
SECTION
double
__tanh (double x)
{

2
sysdeps/x86_64/fpu/multiarch/Makefile
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@ -10,6 +10,7 @@ CFLAGS-s_expm1-fma.c = -mfma -mavx2
CFLAGS-s_log1p-fma.c = -mfma -mavx2
CFLAGS-s_sin-fma.c = -mfma -mavx2
CFLAGS-s_tan-fma.c = -mfma -mavx2
CFLAGS-s_tanh-fma.c = -mfma -mavx2
CFLAGS-s_sincos-fma.c = -mfma -mavx2
CFLAGS-s_exp10m1f-fma.c = -mfma -mavx2
CFLAGS-s_exp2m1f-fma.c = -mfma -mavx2
@ -96,6 +97,7 @@ libm-sysdep_routines += \
s_sinf-sse2 \
s_tan-avx \
s_tan-fma \
s_tanh-fma \
s_trunc-sse4_1 \
s_truncf-sse4_1 \
# libm-sysdep_routines

11
sysdeps/x86_64/fpu/multiarch/s_tanh-fma.c Normal file
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@ -0,0 +1,11 @@
#define __tanh __tanh_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/s_tanh.c>

31
sysdeps/x86_64/fpu/multiarch/s_tanh.c Normal file
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@ -0,0 +1,31 @@
/* Multiple versions of tanh.
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
extern double __redirect_tanh (double);
# define SYMBOL_NAME tanh
# include "ifunc-fma.h"
libc_ifunc_redirected (__redirect_tanh, __tanh, IFUNC_SELECTOR ());
# define __tanh __tanh_sse2
#endif
#include <sysdeps/ieee754/dbl-64/s_tanh.c>