1  /* fmaximum().  LoongArch version.
       2     Copyright (C) 2022-2023 Free Software Foundation, Inc.
       3     This file is part of the GNU C Library.
       4  
       5     The GNU C Library is free software; you can redistribute it and/or
       6     modify it under the terms of the GNU Lesser General Public
       7     License as published by the Free Software Foundation; either
       8     version 2.1 of the License, or (at your option) any later version.
       9  
      10     The GNU C Library is distributed in the hope that it will be useful,
      11     but WITHOUT ANY WARRANTY; without even the implied warranty of
      12     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      13     Lesser General Public License for more details.
      14  
      15     You should have received a copy of the GNU Lesser General Public
      16     License along with the GNU C Library; if not, see
      17     <https://www.gnu.org/licenses/>.  */
      18  
      19  #define NO_MATH_REDIRECT
      20  #include <math.h>
      21  #include <libm-alias-double.h>
      22  #include <fpu_control.h>
      23  
      24  double
      25  __fmaximum (double x, double y)
      26  {
      27    int x_cond;
      28    int y_cond;
      29    asm volatile ("fclass.d \t%0, %1" : "=f" (x_cond) : "f" (x));
      30    asm volatile ("fclass.d \t%0, %1" : "=f" (y_cond) : "f" (y));
      31  
      32    if (__glibc_unlikely((x_cond | y_cond) & _FCLASS_NAN))
      33        return x * y;
      34    else
      35      {
      36        asm volatile ("fmax.d \t%0, %1, %2" : "=f" (x) : "f" (x), "f" (y));
      37        return x;
      38      }
      39  }
      40  libm_alias_double (__fmaximum, fmaximum)