1  /* Copyright (C) 2000-2023 Free Software Foundation, Inc.
       2     This file is part of the GNU C Library.
       3  
       4     The GNU C Library is free software; you can redistribute it and/or
       5     modify it under the terms of the GNU Lesser General Public
       6     License as published by the Free Software Foundation; either
       7     version 2.1 of the License, or (at your option) any later version.
       8  
       9     The GNU C Library is distributed in the hope that it will be useful,
      10     but WITHOUT ANY WARRANTY; without even the implied warranty of
      11     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12     Lesser General Public License for more details.
      13  
      14     You should have received a copy of the GNU Lesser General Public
      15     License along with the GNU C Library.  If not, see
      16     <https://www.gnu.org/licenses/>.  */
      17  
      18  #define NO_MATH_REDIRECT
      19  #include <math.h>
      20  #include <math_ldbl_opt.h>
      21  #include <libm-alias-double.h>
      22  
      23  
      24  double
      25  __rint (double x)
      26  {
      27    if (isnan (x))
      28      return x + x;
      29  
      30    if (isless (fabs (x), 9007199254740992.0))	/* 1 << DBL_MANT_DIG */
      31      {
      32        double tmp1, new_x;
      33        __asm ("cvttq/svid %2,%1\n\t"
      34  	     "cvtqt/d %1,%0\n\t"
      35  	     : "=f"(new_x), "=&f"(tmp1)
      36  	     : "f"(x));
      37  
      38        /* rint(-0.1) == -0, and in general we'll always have the same
      39  	 sign as our input.  */
      40        x = copysign(new_x, x);
      41      }
      42    return x;
      43  }
      44  
      45  libm_alias_double (__rint, rint)