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

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

[Yinyu Cai]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=73e35174f5673d58cb8e1bd5f34c086a7759ff20

commit 73e35174f5673d58cb8e1bd5f34c086a7759ff20
Author: Xiaolin Tang <tangxiaolin@loongson.cn>
Date:   Mon Nov 7 22:08:19 2022 +0800

    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.

Diff:
---
 sysdeps/loongarch/fpu/s_fmaxmag.c  | 29 +++++++++++++++++++++++++++++
 sysdeps/loongarch/fpu/s_fmaxmagf.c | 29 +++++++++++++++++++++++++++++
 sysdeps/loongarch/fpu/s_fminmag.c  | 29 +++++++++++++++++++++++++++++
 sysdeps/loongarch/fpu/s_fminmagf.c | 29 +++++++++++++++++++++++++++++
 4 files changed, 116 insertions(+)

diff --git a/sysdeps/loongarch/fpu/s_fmaxmag.c b/sysdeps/loongarch/fpu/s_fmaxmag.c
new file mode 100644
index 0000000000..8570a3ba48
--- /dev/null
+++ b/sysdeps/loongarch/fpu/s_fmaxmag.c
@@ -0,0 +1,29 @@
+/* fmaxmag().  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
+__fmaxmag (double x, double y)
+{
+  asm volatile ("fmaxa.d \t%0, %1, %2" : "=f" (x) : "f" (x), "f" (y));
+  return x;
+}
+libm_alias_double (__fmaxmag, fmaxmag)
diff --git a/sysdeps/loongarch/fpu/s_fmaxmagf.c b/sysdeps/loongarch/fpu/s_fmaxmagf.c
new file mode 100644
index 0000000000..413e7683dd
--- /dev/null
+++ b/sysdeps/loongarch/fpu/s_fmaxmagf.c
@@ -0,0 +1,29 @@
+/* fmaxmagf().  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-float.h>
+
+float
+__fmaxmagf (float x, float y)
+{
+  asm volatile ("fmaxa.s \t%0, %1, %2" : "=f" (x) : "f" (x), "f" (y));
+  return x;
+}
+libm_alias_float (__fmaxmag, fmaxmag)
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)
diff --git a/sysdeps/loongarch/fpu/s_fminmagf.c b/sysdeps/loongarch/fpu/s_fminmagf.c
new file mode 100644
index 0000000000..4d625312c0
--- /dev/null
+++ b/sysdeps/loongarch/fpu/s_fminmagf.c
@@ -0,0 +1,29 @@
+/* fminmagf().  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-float.h>
+
+float
+__fminmagf (float x, float y)
+{
+  asm volatile ("fmina.s \t%0, %1, %2" : "=f" (x) : "f" (x), "f" (y));
+  return x;
+}
+libm_alias_float (__fminmag, fminmag)