sysdeps/ieee754/ldbl-128ibm/s_floorl.c

   1 /* Round to int long double floating-point values.
   2    IBM extended format long double version.
   3    Copyright (C) 2006-2024 Free Software Foundation, Inc.
   4    This file is part of the GNU C Library.
   5
   6    The GNU C Library is free software; you can redistribute it and/or
   7    modify it under the terms of the GNU Lesser General Public
   8    License as published by the Free Software Foundation; either
   9    version 2.1 of the License, or (at your option) any later version.
  10
  11    The GNU C Library is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14    Lesser General Public License for more details.
  15
  16    You should have received a copy of the GNU Lesser General Public
  17    License along with the GNU C Library; if not, see
  18    <https://www.gnu.org/licenses/>.  */
  19
  20 #define NO_MATH_REDIRECT
  21 #include <math.h>
  22 #include <math_private.h>
  23 #include <math_ldbl_opt.h>
  24 #include <float.h>
  25 #include <ieee754.h>
  26
  27 double floor (double) asm ("__floor");
  28
  29
  30 long double
  31 __floorl (long double x)
  32 {
  33   double xh, xl, hi, lo;
  34
  35   ldbl_unpack (x, &xh, &xl);
  36
  37   /* Return Inf, Nan, +/-0 unchanged.  */
  38   if (__builtin_expect (xh != 0.0
  39                         && __builtin_isless (__builtin_fabs (xh),
  40                                              __builtin_inf ()), 1))
  41     {
  42       hi = floor (xh);
  43       if (hi != xh)
  44         {
  45           /* The high part is not an integer; the low part does not
  46              affect the result.  */
  47           xh = hi;
  48           xl = 0;
  49         }
  50       else
  51         {
  52           /* The high part is a nonzero integer.  */
  53           lo = floor (xl);
  54           xh = hi;
  55           xl = lo;
  56           ldbl_canonicalize_int (&xh, &xl);
  57         }
  58     }
  59   else
  60     /* Quiet signaling NaN arguments.  */
  61     xh += xh;
  62
  63   return ldbl_pack (xh, xl);
  64 }
  65
  66 long_double_symbol (libm, __floorl, floorl);