LoongArch: Hard Float Support for fmaxmag{f/ }, fminmag{f/ }.

Use hardware Floating-point instruction f{maxa/mina}.{s/d},
to implement fmaxmag{f/ }, fminmag{f/ }.

       *  sysdeps/loongarch/fpu/s_fmaxmag.c: New file.
       *  sysdeps/loongarch/fpu/s_fmaxmagf.c: Likewise.
       *  sysdeps/loongarch/fpu/s_fminmag.c: Likewise.
       *  sysdeps/loongarch/fpu/s_fminmagf.c: Likewise.

1 files changed, 29 insertions, 0 deletions

diff --git a/sysdeps/loongarch/fpu/s_fminmag.c b/sysdeps/loongarch/fpu/s_fminmag.c
new file mode 100644
index 0000000000..2badf3d3e5
--- /dev/null
+++ b/sysdeps/loongarch/fpu/s_fminmag.c
@@ -0,0 +1,29 @@
+/* fminmag().  LoongArch version.
+   Copyright (C) 2022 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/>.  */
+
+#define NO_MATH_REDIRECT
+#include <math.h>
+#include <libm-alias-double.h>
+
+double
+__fminmag (double x, double y)
+{
+  asm volatile ("fmina.d \t%0, %1, %2" : "=f" (x) : "f" (x), "f" (y));
+  return x;
+}
+libm_alias_double (__fminmag, fminmag)