/*      $NetBSD: frnd.c,v 1.5 2012/02/04 17:03:10 skrll Exp $   */

/*      $OpenBSD: frnd.c,v 1.5 2001/03/29 03:58:18 mickey Exp $ */

/*
 * Copyright 1996 1995 by Open Software Foundation, Inc.
 *              All Rights Reserved
 *
 * Permission to use, copy, modify, and distribute this software and
 * its documentation for any purpose and without fee is hereby granted,
 * provided that the above copyright notice appears in all copies and
 * that both the copyright notice and this permission notice appear in
 * supporting documentation.
 *
 * OSF DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
 * FOR A PARTICULAR PURPOSE.
 *
 * IN NO EVENT SHALL OSF BE LIABLE FOR ANY SPECIAL, INDIRECT, OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM
 * LOSS OF USE, DATA OR PROFITS, WHETHER IN ACTION OF CONTRACT,
 * NEGLIGENCE, OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
 * WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 *
 */
/*
 * pmk1.1
 */
/*
 * (c) Copyright 1986 HEWLETT-PACKARD COMPANY
 *
 * To anyone who acknowledges that this file is provided "AS IS"
 * without any express or implied warranty:
 *     permission to use, copy, modify, and distribute this file
 * for any purpose is hereby granted without fee, provided that
 * the above copyright notice and this notice appears in all
 * copies, and that the name of Hewlett-Packard Company not be
 * used in advertising or publicity pertaining to distribution
 * of the software without specific, written prior permission.
 * Hewlett-Packard Company makes no representations about the
 * suitability of this software for any purpose.
 */

#include <sys/cdefs.h>
__KERNEL_RCSID(0, "$NetBSD: frnd.c,v 1.5 2012/02/04 17:03:10 skrll Exp $");

#include "../spmath/float.h"
#include "../spmath/sgl_float.h"
#include "../spmath/dbl_float.h"
#include "../spmath/quad_float.h"
#include "../spmath/cnv_float.h"

/*
 *  Single Floating-point Round to Integer
 */

/*ARGSUSED*/
int
sgl_frnd(sgl_floating_point *srcptr, sgl_floating_point *dstptr,
    unsigned int *status)
{
        register unsigned int src, result;
        register int src_exponent;
        register int inexact = false;

        src = *srcptr;
        /*
         * check source operand for NaN or infinity
         */
        if ((src_exponent = Sgl_exponent(src)) == SGL_INFINITY_EXPONENT) {
                /*
                 * is signaling NaN?
                 */
                if (Sgl_isone_signaling(src)) {
                        /* trap if INVALIDTRAP enabled */
                        if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION);
                        /* make NaN quiet */
                        Set_invalidflag();
                        Sgl_set_quiet(src);
                }
                /*
                 * return quiet NaN or infinity
                 */
                *dstptr = src;
                return(NOEXCEPTION);
        }
        /*
         * Need to round?
         */
        if ((src_exponent -= SGL_BIAS) >= SGL_P - 1) {
                *dstptr = src;
                return(NOEXCEPTION);
        }
        /*
         * Generate result
         */
        if (src_exponent >= 0) {
                Sgl_clear_exponent_set_hidden(src);
                result = src;
                Sgl_rightshift(result,(SGL_P-1) - (src_exponent));
                /* check for inexact */
                if (Sgl_isinexact_to_fix(src,src_exponent)) {
                        inexact = true;
                        /*  round result  */
                        switch (Rounding_mode()) {
                        case ROUNDPLUS:
                             if (Sgl_iszero_sign(src)) Sgl_increment(result);
                             break;
                        case ROUNDMINUS:
                             if (Sgl_isone_sign(src)) Sgl_increment(result);
                             break;
                        case ROUNDNEAREST:
                             if (Sgl_isone_roundbit(src,src_exponent))
                                if (Sgl_isone_stickybit(src,src_exponent)
                                || (Sgl_isone_lowmantissa(result)))
                                        Sgl_increment(result);
                        }
                }
                Sgl_leftshift(result,(SGL_P-1) - (src_exponent));
                if (Sgl_isone_hiddenoverflow(result))
                        Sgl_set_exponent(result,src_exponent + (SGL_BIAS+1));
                else Sgl_set_exponent(result,src_exponent + SGL_BIAS);
        }
        else {
                result = src;           /* set sign */
                Sgl_setzero_exponentmantissa(result);
                /* check for inexact */
                if (Sgl_isnotzero_exponentmantissa(src)) {
                        inexact = true;
                        /*  round result  */
                        switch (Rounding_mode()) {
                        case ROUNDPLUS:
                             if (Sgl_iszero_sign(src))
                                Sgl_set_exponent(result,SGL_BIAS);
                             break;
                        case ROUNDMINUS:
                             if (Sgl_isone_sign(src))
                                Sgl_set_exponent(result,SGL_BIAS);
                             break;
                        case ROUNDNEAREST:
                             if (src_exponent == -1)
                                if (Sgl_isnotzero_mantissa(src))
                                   Sgl_set_exponent(result,SGL_BIAS);
                        }
                }
        }
        *dstptr = result;
        if (inexact) {
                if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
                else Set_inexactflag();
        }
        return(NOEXCEPTION);
}

/*
 *  Double Floating-point Round to Integer
 */

/*ARGSUSED*/
int
dbl_frnd(dbl_floating_point *srcptr, dbl_floating_point *dstptr,
    unsigned int *status)
{
        register unsigned int srcp1, srcp2, resultp1, resultp2;
        register int src_exponent;
        register int inexact = false;

        Dbl_copyfromptr(srcptr,srcp1,srcp2);
        /*
         * check source operand for NaN or infinity
         */
        if ((src_exponent = Dbl_exponent(srcp1)) == DBL_INFINITY_EXPONENT) {
                /*
                 * is signaling NaN?
                 */
                if (Dbl_isone_signaling(srcp1)) {
                        /* trap if INVALIDTRAP enabled */
                        if (Is_invalidtrap_enabled()) return(INVALIDEXCEPTION);
                        /* make NaN quiet */
                        Set_invalidflag();
                        Dbl_set_quiet(srcp1);
                }
                /*
                 * return quiet NaN or infinity
                 */
                Dbl_copytoptr(srcp1,srcp2,dstptr);
                return(NOEXCEPTION);
        }
        /*
         * Need to round?
         */
        if ((src_exponent -= DBL_BIAS) >= DBL_P - 1) {
                Dbl_copytoptr(srcp1,srcp2,dstptr);
                return(NOEXCEPTION);
        }
        /*
         * Generate result
         */
        if (src_exponent >= 0) {
                Dbl_clear_exponent_set_hidden(srcp1);
                resultp1 = srcp1;
                resultp2 = srcp2;
                Dbl_rightshift(resultp1,resultp2,(DBL_P-1) - (src_exponent));
                /* check for inexact */
                if (Dbl_isinexact_to_fix(srcp1,srcp2,src_exponent)) {
                        inexact = true;
                        /*  round result  */
                        switch (Rounding_mode()) {
                        case ROUNDPLUS:
                             if (Dbl_iszero_sign(srcp1))
                                Dbl_increment(resultp1,resultp2);
                             break;
                        case ROUNDMINUS:
                             if (Dbl_isone_sign(srcp1))
                                Dbl_increment(resultp1,resultp2);
                             break;
                        case ROUNDNEAREST:
                             if (Dbl_isone_roundbit(srcp1,srcp2,src_exponent))
                              if (Dbl_isone_stickybit(srcp1,srcp2,src_exponent)
                                  || (Dbl_isone_lowmantissap2(resultp2)))
                                        Dbl_increment(resultp1,resultp2);
                        }
                }
                Dbl_leftshift(resultp1,resultp2,(DBL_P-1) - (src_exponent));
                if (Dbl_isone_hiddenoverflow(resultp1))
                        Dbl_set_exponent(resultp1,src_exponent + (DBL_BIAS+1));
                else Dbl_set_exponent(resultp1,src_exponent + DBL_BIAS);
        }
        else {
                resultp1 = srcp1;  /* set sign */
                Dbl_setzero_exponentmantissa(resultp1,resultp2);
                /* check for inexact */
                if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) {
                        inexact = true;
                        /*  round result  */
                        switch (Rounding_mode()) {
                        case ROUNDPLUS:
                             if (Dbl_iszero_sign(srcp1))
                                Dbl_set_exponent(resultp1,DBL_BIAS);
                             break;
                        case ROUNDMINUS:
                             if (Dbl_isone_sign(srcp1))
                                Dbl_set_exponent(resultp1,DBL_BIAS);
                             break;
                        case ROUNDNEAREST:
                             if (src_exponent == -1)
                                if (Dbl_isnotzero_mantissa(srcp1,srcp2))
                                   Dbl_set_exponent(resultp1,DBL_BIAS);
                        }
                }
        }
        Dbl_copytoptr(resultp1,resultp2,dstptr);
        if (inexact) {
                if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
                else Set_inexactflag();
        }
        return(NOEXCEPTION);
}

/*ARGSUSED*/
int
quad_frnd(quad_floating_point *srcptr, quad_floating_point *dstptr,
    unsigned int *status)
{
        return(UNIMPLEMENTEDEXCEPTION);
}