x86_64: Add sinh with FMA

On SPR, it improves sinh bench performance by:

			Before		After		Improvement
reciprocal-throughput	14.2017		11.815		17%
latency			36.4917		35.2114		4%

Reviewed-by: H.J. Lu <hjl.tools@gmail.com>

benchtests/sinh-inputs

@@ -1,6 +1,7 @@
 ## args: double
 ## ret: double
 ## includes: math.h
+## name: workload-random
 0x1.bcb6129b5ff2bp8
 -0x1.63057386325ebp9
 0x1.62f1d7dc4e8bfp9

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

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
@@ -69,6 +70,7 @@ 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 \

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>

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>