gcc-4.8.3/libquadmath/math/isnanq.c


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/* isnanq.c -- __float128 version of s_isnan.c.
 * Conversion to long double by Jakub Jelinek, jj@ultra.linux.cz.
 */

/*
 * ====================================================
 * Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved.
 *
 * Developed at SunPro, a Sun Microsystems, Inc. business.
 * Permission to use, copy, modify, and distribute this
 * software is freely granted, provided that this notice
 * is preserved.
 * ====================================================
 */

#include "quadmath-imp.h"

int
isnanq (const __float128 x)
{
  int64_t hx,lx;
  GET_FLT128_WORDS64(hx,lx,x);
  hx &= 0x7fffffffffffffffLL;
  hx |= (uint64_t)(lx|(-lx))>>63;
  hx = 0x7fff000000000000LL - hx;
  return (int)((uint64_t)hx>>63);
}