sysdeps/ieee754/ldbl-128ibm/s_isnanl.c

   1 /* s_isnanl.c -- long double version of s_isnan.c.
   2  * Conversion to long double by Jakub Jelinek, jj@ultra.linux.cz.
   3  */
   4
   5 /*
   6  * ====================================================
   7  * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
   8  *
   9  * Developed at SunPro, a Sun Microsystems, Inc. business.
  10  * Permission to use, copy, modify, and distribute this
  11  * software is freely granted, provided that this notice
  12  * is preserved.
  13  * ====================================================
  14  */
  15
  16 #if defined(LIBM_SCCS) && !defined(lint)
  17 static char rcsid[] = "$NetBSD: $";
  18 #endif
  19
  20 /*
  21  * isnanl(x) returns 1 is x is nan, else 0;
  22  * no branching!
  23  */
  24
  25 #include <math.h>
  26 #include <math_private.h>
  27 #include <math_ldbl_opt.h>
  28
  29 int
  30 ___isnanl (long double x)
  31 {
  32   uint64_t hx;
  33   double xhi;
  34
  35   xhi = ldbl_high (x);
  36   EXTRACT_WORDS64 (hx, xhi);
  37   hx &= 0x7fffffffffffffffLL;
  38   hx = 0x7ff0000000000000LL - hx;
  39   return (int) (hx >> 63);
  40 }
  41 hidden_ver (___isnanl, __isnanl)
  42 #ifndef IS_IN_libm
  43 weak_alias (___isnanl, ____isnanl)
  44 long_double_symbol (libc, ___isnanl, isnanl);
  45 long_double_symbol (libc, ____isnanl, __isnanl);
  46 #endif