libquadmath/math/isnanq.c

   1 /* isnanq.c -- __float128 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 #include "quadmath-imp.h"
  17
  18 int
  19 isnanq (const __float128 x)
  20 {
  21   int64_t hx,lx;
  22   GET_FLT128_WORDS64(hx,lx,x);
  23   hx &= 0x7fffffffffffffffLL;
  24   hx |= (uint64_t)(lx|(-lx))>>63;
  25   hx = 0x7fff000000000000LL - hx;
  26   return (int)((uint64_t)hx>>63);
  27 }