sysdeps/powerpc/fpu/s_modff.c

   1 /* Copyright (C) 2013-2023 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 Library General Public License as
   6    published by the Free Software Foundation; either version 2 of the
   7    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    Library General Public License for more details.
  13
  14    You should have received a copy of the GNU Library General Public
  15    License along with the GNU C Library; see the file COPYING.LIB.  If
  16    not, see <https://www.gnu.org/licenses/>.  */
  17
  18 /* ISA 2.07 provides fast GPR to FP instruction (mfvsr{d,wz}) which make
  19    generic implementation faster.  Also disables for old ISAs that do not
  20    have ceil/floor instructions.  */
  21 #if defined(_ARCH_PWR8) || !defined(_ARCH_PWR5X)
  22 # include <sysdeps/ieee754/flt-32/s_modff.c>
  23 #else
  24 # include <math.h>
  25 # include <libm-alias-float.h>
  26
  27 float
  28 __modff (float x, float *iptr)
  29 {
  30   if (__builtin_isinff (x))
  31     {
  32       *iptr = x;
  33       return copysignf (0.0, x);
  34     }
  35   else if (__builtin_isnanf (x))
  36     {
  37       *iptr = NAN;
  38       return NAN;
  39     }
  40
  41   if (x >= 0.0)
  42     {
  43       *iptr = floorf (x);
  44       return copysignf (x - *iptr, x);
  45     }
  46   else
  47     {
  48       *iptr = ceilf (x);
  49       return copysignf (x - *iptr, x);
  50     }
  51 }
  52 # ifndef __modff
  53 libm_alias_float (__modf, modf)
  54 # endif
  55 #endif