sysdeps/ieee754/dbl-64/wordsize-64/s_finite.c

   1 /*
   2  * ====================================================
   3  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   4  *
   5  * Developed at SunPro, a Sun Microsystems, Inc. business.
   6  * Permission to use, copy, modify, and distribute this
   7  * software is freely granted, provided that this notice
   8  * is preserved.
   9  * ====================================================
  10  */
  11
  12 /*
  13  * finite(x) returns 1 is x is finite, else 0;
  14  * no branching!
  15  */
  16
  17 #include <math.h>
  18 #include <math_private.h>
  19
  20 #undef __finite
  21 int
  22 __finite(double x)
  23 {
  24   int64_t lx;
  25   EXTRACT_WORDS64(lx,x);
  26   return (int)((uint64_t)((lx&INT64_C(0x7fffffffffffffff))-INT64_C(0x7ff0000000000000))>>63);
  27 }
  28 hidden_def (__finite)
  29 weak_alias (__finite, finite)
  30 #ifdef NO_LONG_DOUBLE
  31 strong_alias (__finite, __finitel)
  32 weak_alias (__finite, finitel)
  33 #endif