[PATCH 15/15] x86_64: Add asinpif with FMA

[Adhemerval Zanella]

The CORE-MATH asinpif implementation showed slight worse performance
when using x86_64 baseline ABI due its usage of fma on fast path.
This patch adds a ifunc variant with similar performance for x86_64-v3.
---
 sysdeps/ieee754/flt-32/s_asinpif.c           |  2 ++
 sysdeps/x86_64/fpu/multiarch/Makefile        |  2 ++
 sysdeps/x86_64/fpu/multiarch/s_asinpif-fma.c |  4 +++
 sysdeps/x86_64/fpu/multiarch/s_asinpif.c     | 33 ++++++++++++++++++++
 4 files changed, 41 insertions(+)
 create mode 100644 sysdeps/x86_64/fpu/multiarch/s_asinpif-fma.c
 create mode 100644 sysdeps/x86_64/fpu/multiarch/s_asinpif.c

diff --git a/sysdeps/ieee754/flt-32/s_asinpif.c b/sysdeps/ieee754/flt-32/s_asinpif.c
index 585dc3f06e..42dbafdf97 100644
--- a/sysdeps/ieee754/flt-32/s_asinpif.c
+++ b/sysdeps/ieee754/flt-32/s_asinpif.c
@@ -133,4 +133,6 @@ __asinpif (float x)
       return r;
     }
 }
+#ifndef __asinpif
 libm_alias_float (__asinpi, asinpi)
+#endif
diff --git a/sysdeps/x86_64/fpu/multiarch/Makefile b/sysdeps/x86_64/fpu/multiarch/Makefile
index e823d2fcc6..e00d76eb81 100644
--- a/sysdeps/x86_64/fpu/multiarch/Makefile
+++ b/sysdeps/x86_64/fpu/multiarch/Makefile
@@ -13,6 +13,7 @@ CFLAGS-s_tan-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
+CFLAGS-s_asinpif-fma.c = -mfma -mavx2
 
 CFLAGS-e_exp2f-fma.c = -mfma -mavx2
 CFLAGS-e_expf-fma.c = -mfma -mavx2
@@ -68,6 +69,7 @@ libm-sysdep_routines += \
   e_logf-fma \
   e_pow-fma \
   e_powf-fma \
+  s_asinpif-fma \
   s_atan-avx \
   s_atan-fma \
   s_ceil-sse4_1 \
diff --git a/sysdeps/x86_64/fpu/multiarch/s_asinpif-fma.c b/sysdeps/x86_64/fpu/multiarch/s_asinpif-fma.c
new file mode 100644
index 0000000000..3c85bec1c9
--- /dev/null
+++ b/sysdeps/x86_64/fpu/multiarch/s_asinpif-fma.c
@@ -0,0 +1,4 @@
+#define __asinpif __asinpif_fma
+#define SECTION __attribute__ ((section (".text.fma")))
+
+#include <sysdeps/ieee754/flt-32/s_asinpif.c>
diff --git a/sysdeps/x86_64/fpu/multiarch/s_asinpif.c b/sysdeps/x86_64/fpu/multiarch/s_asinpif.c
new file mode 100644
index 0000000000..98add04b7f
--- /dev/null
+++ b/sysdeps/x86_64/fpu/multiarch/s_asinpif.c
@@ -0,0 +1,33 @@
+/* Multiple versions of asinpif.
+   Copyright (C) 2024-2025 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-float.h>
+
+extern float __redirect_asinpif (float);
+
+# define SYMBOL_NAME asinpif
+# include "ifunc-fma.h"
+
+libc_ifunc_redirected (__redirect_asinpif, __asinpif, IFUNC_SELECTOR ());
+libm_alias_float (__asinpi, asinpi)
+
+# define __asinpif __asinpif_sse2
+#endif
+#include <sysdeps/ieee754/flt-32/s_asinpif.c>
-- 
2.43.0