sysdeps/powerpc/fpu/s_llround.c

   1 /* Round double value to long long int.
   2    Copyright (C) 1997-2015 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    <http://www.gnu.org/licenses/>.  */
  18
  19 #include <math.h>
  20 #include <math_ldbl_opt.h>
  21
  22 /* Round to the nearest integer, with values exactly on a 0.5 boundary
  23    rounded away from zero, regardless of the current rounding mode.
  24    If (long long)x, when x is out of range of a long long, clips at
  25    LLONG_MAX or LLONG_MIN, then this implementation also clips.  */
  26
  27 long long int
  28 __llround (double x)
  29 {
  30   long long xr = (long long) x;
  31   double xrf = (double) xr;
  32
  33   if (x >= 0.0)
  34     {
  35       if (x - xrf >= 0.5)
  36         xr += (long long) ((unsigned long long) xr + 1) > 0;
  37     }
  38   else
  39     {
  40       if (xrf - x >= 0.5)
  41         xr -= (long long) ((unsigned long long) xr - 1) < 0;
  42     }
  43   return xr;
  44 }
  45 weak_alias (__llround, llround)
  46 #ifdef NO_LONG_DOUBLE
  47 strong_alias (__llround, __llroundl)
  48 weak_alias (__llround, llroundl)
  49 #endif
  50 #if LONG_DOUBLE_COMPAT (libm, GLIBC_2_1)
  51 compat_symbol (libm, __llround, llroundl, GLIBC_2_1);
  52 #endif