newlib/libm/common/s_finite.c

   1
   2 /* @(#)s_finite.c 5.1 93/09/24 */
   3 /*
   4  * ====================================================
   5  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   6  *
   7  * Developed at SunPro, a Sun Microsystems, Inc. business.
   8  * Permission to use, copy, modify, and distribute this
   9  * software is freely granted, provided that this notice
  10  * is preserved.
  11  * ====================================================
  12  */
  13
  14 /*
  15  * finite(x) returns 1 is x is finite, else 0;
  16  * no branching!
  17  */
  18
  19 #include "fdlibm.h"
  20
  21 #ifndef _DOUBLE_IS_32BITS
  22
  23 #ifdef __STDC__
  24         int finite(double x)
  25 #else
  26         int finite(x)
  27         double x;
  28 #endif
  29 {
  30         __int32_t hx;
  31         GET_HIGH_WORD(hx,x);
  32         return  (int)((__uint32_t)((hx&0x7fffffff)-0x7ff00000)>>31);
  33 }
  34
  35 #endif /* _DOUBLE_IS_32BITS */