lib/isfinite.c

   1 /* Test for finite value (zero, subnormal, or normal, and not infinite or NaN).
   2    Copyright (C) 2007-2024 Free Software Foundation, Inc.
   3
   4    This file is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU Lesser General Public License as
   6    published by the Free Software Foundation, either version 3 of the
   7    License, or (at your option) any later version.
   8
   9    This file 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
  12    GNU Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Ben Pfaff <blp@gnu.org>, 2007. */
  18
  19 #include <config.h>
  20
  21 #include "isnanf-nolibm.h"
  22 #include "isnand-nolibm.h"
  23 #include "isnanl-nolibm.h"
  24
  25 /* The "cc" compiler on HP-UX 11.11, when optimizing, simplifies the test
  26    x - y == 0.0  to  x == y, a simplification which is invalid when x and y
  27    are Infinity.  Disable this optimization.  */
  28 #if defined __hpux && !defined __GNUC__
  29 static float zerof;
  30 static double zerod;
  31 static long double zerol;
  32 #else
  33 # define zerof 0.f
  34 # define zerod 0.
  35 # define zerol 0.L
  36 #endif
  37
  38 int gl_isfinitef (float x)
  39 {
  40   return !isnanf (x) && x - x == zerof;
  41 }
  42
  43 int gl_isfinited (double x)
  44 {
  45   return !isnand (x) && x - x == zerod;
  46 }
  47
  48 int gl_isfinitel (long double x)
  49 {
  50   return !isnanl (x) && x - x == zerol;
  51 }