commit 0edcc77fe7e13b29d99e7f4d7fe3373b3666468e
Author: Sunil K Pandey <skpgkp2@gmail.com>
Date:   Mon Mar 10 10:24:07 2025 -0700

    x86_64: Add tanh with FMA
    
    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)

diff --git a/sysdeps/ieee754/dbl-64/s_tanh.c b/sysdeps/ieee754/dbl-64/s_tanh.c
index 673a97102de292fd..13063db04ebb198c 100644
--- a/sysdeps/ieee754/dbl-64/s_tanh.c
+++ b/sysdeps/ieee754/dbl-64/s_tanh.c
@@ -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)
 {
diff --git a/sysdeps/x86_64/fpu/multiarch/Makefile b/sysdeps/x86_64/fpu/multiarch/Makefile
index cbe09d49f49581f1..0f69f7089c06af73 100644
--- a/sysdeps/x86_64/fpu/multiarch/Makefile
+++ b/sysdeps/x86_64/fpu/multiarch/Makefile
@@ -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-e_exp2f-fma.c = -mfma -mavx2
@@ -92,6 +93,7 @@ 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
diff --git a/sysdeps/x86_64/fpu/multiarch/s_tanh-fma.c b/sysdeps/x86_64/fpu/multiarch/s_tanh-fma.c
new file mode 100644
index 0000000000000000..1b808b1227f50cf5
--- /dev/null
+++ b/sysdeps/x86_64/fpu/multiarch/s_tanh-fma.c
@@ -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>
diff --git a/sysdeps/x86_64/fpu/multiarch/s_tanh.c b/sysdeps/x86_64/fpu/multiarch/s_tanh.c
new file mode 100644
index 0000000000000000..5539b6c61c63548d
--- /dev/null
+++ b/sysdeps/x86_64/fpu/multiarch/s_tanh.c
@@ -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>