/* s_modfl.c -- long double version of s_modf.c.

 * Conversion to long double by Ulrich Drepper,

 * Cygnus Support, drepper@cygnus.com.

 */

/*

 * ====================================================

 * 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.

 * ====================================================

 */

/*

 * modfl(long double x, long double *iptr)

 * return fraction part of x, and return x's integral part in *iptr.

 * Method:

 *	Bit twiddling.

 *

 * Exception:

 *	No exception.

 */

#include <math.h>

#include <math_private.h>

#include <libm-alias-ldouble.h>

static const long double one = 1.0;

long double

__modfl(long double x, long double *iptr)

{

	int32_t i0,i1,j0;

	uint32_t i,se;

	GET_LDOUBLE_WORDS(se,i0,i1,x);

	j0 = (se&0x7fff)-0x3fff;	/* exponent of x */

	if(j0<32) {			/* integer part in high x */

	    if(j0<0) {			/* |x|<1 */

		SET_LDOUBLE_WORDS(*iptr,se&0x8000,0,0);	/* *iptr = +-0 */

		return x;

	    } else {

		i = (0x7fffffff)>>j0;

		if(((i0&i)|i1)==0) {		/* x is integral */

		    *iptr = x;

		    SET_LDOUBLE_WORDS(x,se&0x8000,0,0);	/* return +-0 */

		    return x;

		} else {

		    SET_LDOUBLE_WORDS(*iptr,se,i0&(~i),0);

		    return x - *iptr;

		}

	    }

	} else if (__builtin_expect(j0>63, 0)) { /* no fraction part */

	    *iptr = x*one;

	    /* We must handle NaNs separately.  */

	    if (j0 == 0x4000 && ((i0 & 0x7fffffff) | i1))

	      return x*one;

	    SET_LDOUBLE_WORDS(x,se&0x8000,0,0);	/* return +-0 */

	    return x;

	} else {			/* fraction part in low x */

	    i = ((uint32_t)(0x7fffffff))>>(j0-32);

	    if((i1&i)==0) { 		/* x is integral */

		*iptr = x;

		SET_LDOUBLE_WORDS(x,se&0x8000,0,0);	/* return +-0 */

		return x;

	    } else {

		SET_LDOUBLE_WORDS(*iptr,se,i0,i1&(~i));

		return x - *iptr;

	    }

	}

}

libm_alias_ldouble (__modf, modf)