sysdeps/powerpc/fpu/s_isnan.c

   1 /* Return 1 if argument is a NaN, else 0.
   2    Copyright (C) 1997-2018 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 /* Ugly kludge to avoid declarations.  */
  20 #define __isnanf __Xisnanf
  21 #define isnanf Xisnanf
  22 #define __GI___isnanf __GI___Xisnanf
  23
  24 #include <math.h>
  25 #include <math_ldbl_opt.h>
  26 #include <fenv_libc.h>
  27
  28 #undef __isnanf
  29 #undef isnanf
  30 #undef __GI___isnanf
  31
  32
  33 /* The hidden_proto in include/math.h was obscured by the macro hackery.  */
  34 __typeof (__isnan) __isnanf;
  35 hidden_proto (__isnanf)
  36
  37
  38 int
  39 __isnan (double x)
  40 {
  41   fenv_t savedstate;
  42   int result;
  43   savedstate = fegetenv_register ();
  44   reset_fpscr_bit (FPSCR_VE);
  45   result = !(x == x);
  46   fesetenv_register (savedstate);
  47   return result;
  48 }
  49 hidden_def (__isnan)
  50 weak_alias (__isnan, isnan)
  51
  52
  53 /* It turns out that the 'double' version will also always work for
  54    single-precision.  */
  55 strong_alias (__isnan, __isnanf)
  56 hidden_def (__isnanf)
  57 weak_alias (__isnanf, isnanf)
  58
  59 #ifdef NO_LONG_DOUBLE
  60 strong_alias (__isnan, __isnanl)
  61 weak_alias (__isnan, isnanl)
  62 #endif