source: soft/giet_vm/giet_libs/math/s_isnan.c @ 581

/*
 * ====================================================
 * 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.
 * ====================================================
 */

/* Modified for GIET-VM static OS at UPMC, France 2015.
 */

/*
 * isnan(x) returns 1 is x is nan, else 0;
 * no branching!
 */

#include "../math.h"
#include "math_private.h"

int isnan(double x)
{
        int32_t hx,lx;
        EXTRACT_WORDS(hx,lx,x);
        hx &= 0x7fffffff;
        hx |= (u_int32_t)(lx|(-lx))>>31;
        hx = 0x7ff00000 - hx;
        return (int)(((u_int32_t)hx)>>31);
}