newlib/libm/common/sl_finite.c

   1 /* Copyright (C) 2015 by  Red Hat, Incorporated. All rights reserved.
   2  *
   3  * Permission to use, copy, modify, and distribute this software
   4  * is freely granted, provided that this notice is preserved.
   5  */
   6
   7 /* finitel(x) returns 1 is x is finite, else 0; */
   8
   9 #include <math.h>
  10
  11 int
  12 finitel (long double x)
  13 {
  14 #ifdef _LDBL_EQ_DBL
  15   return finite (x);
  16 #else
  17   /* Let the compiler do this for us.
  18      Note - we do not know how many bits there are in a long double.
  19      Some architectures for example have an 80-bit long double whereas
  20      others use 128-bits.  We use macros and comiler builtin functions
  21      to avoid specific knowledge of the long double format.  */
  22   return __builtin_isfinite (x);
  23 #endif
  24 }
  25