sysdeps/ieee754/ldbl-128/s_isnanl.c

   1 /* s_isnanl.c -- long double version of s_isnan.c.
   2  */
   3
   4 /*
   5  * ====================================================
   6  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   7  *
   8  * Developed at SunPro, a Sun Microsystems, Inc. business.
   9  * Permission to use, copy, modify, and distribute this
  10  * software is freely granted, provided that this notice
  11  * is preserved.
  12  * ====================================================
  13  */
  14
  15 #if defined(LIBM_SCCS) && !defined(lint)
  16 static char rcsid[] = "$NetBSD: $";
  17 #endif
  18
  19 /*
  20  * isnanl(x) returns 1 is x is nan, else 0;
  21  * no branching!
  22  */
  23
  24 #include <math.h>
  25 #include <math_private.h>
  26
  27 int __isnanl(_Float128 x)
  28 {
  29         int64_t hx,lx;
  30         GET_LDOUBLE_WORDS64(hx,lx,x);
  31         hx &= 0x7fffffffffffffffLL;
  32         hx |= (uint64_t)(lx|(-lx))>>63;
  33         hx = 0x7fff000000000000LL - hx;
  34         return (int)((uint64_t)hx>>63);
  35 }
  36 mathx_hidden_def (__isnanl)
  37 weak_alias (__isnanl, isnanl)