/*      $NetBSD: fcnvfxt.c,v 1.5 2012/02/04 17:03:09 skrll Exp $        */

/*      $OpenBSD: fcnvfxt.c,v 1.8 2010/07/30 18:05:23 kettenis 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: fcnvfxt.c,v 1.5 2012/02/04 17:03:09 skrll Exp $");

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

/*
 *  Convert single floating-point to single fixed-point format
 *  with truncated result
 */
/*ARGSUSED*/
int
sgl_to_sgl_fcnvfxt(sgl_floating_point *srcptr, int *dstptr,
    unsigned int *status)
{
        register unsigned int src, temp;
        register int src_exponent, result;

        src = *srcptr;
        src_exponent = Sgl_exponent(src) - SGL_BIAS;

        /*
         * Test for overflow
         */
        if (src_exponent > SGL_FX_MAX_EXP) {
                /* check for MININT */
                if ((src_exponent > SGL_FX_MAX_EXP + 1) ||
                Sgl_isnotzero_mantissa(src) || Sgl_iszero_sign(src)) {
                        if (Sgl_iszero_sign(src)) result = 0x7fffffff;
                        else result = 0x80000000;

                        if (Is_invalidtrap_enabled()) {
                                return(INVALIDEXCEPTION);
                        }
                        Set_invalidflag();
                        *dstptr = result;
                        return(NOEXCEPTION);
                }
        }
        /*
         * Generate result
         */
        if (src_exponent >= 0) {
                temp = src;
                Sgl_clear_signexponent_set_hidden(temp);
                Int_from_sgl_mantissa(temp,src_exponent);
                if (Sgl_isone_sign(src))  result = -Sgl_all(temp);
                else result = Sgl_all(temp);
                *dstptr = result;

                /* check for inexact */
                if (Sgl_isinexact_to_fix(src,src_exponent)) {
                        if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
                        else Set_inexactflag();
                }
        }
        else {
                *dstptr = 0;

                /* check for inexact */
                if (Sgl_isnotzero_exponentmantissa(src)) {
                        if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
                        else Set_inexactflag();
                }
        }
        return(NOEXCEPTION);
}

/*
 *  Single Floating-point to Double Fixed-point
 */
/*ARGSUSED*/
int
sgl_to_dbl_fcnvfxt(sgl_floating_point *srcptr, dbl_integer *dstptr,
    unsigned int *status)
{
        register int src_exponent, resultp1;
        register unsigned int src, temp, resultp2;

        src = *srcptr;
        src_exponent = Sgl_exponent(src) - SGL_BIAS;

        /*
         * Test for overflow
         */
        if (src_exponent > DBL_FX_MAX_EXP) {
                /* check for MININT */
                if ((src_exponent > DBL_FX_MAX_EXP + 1) ||
                Sgl_isnotzero_mantissa(src) || Sgl_iszero_sign(src)) {
                        if (Sgl_iszero_sign(src)) {
                                resultp1 = 0x7fffffff;
                                resultp2 = 0xffffffff;
                        }
                        else {
                                resultp1 = 0x80000000;
                                resultp2 = 0;
                        }

                        if (Is_invalidtrap_enabled()) {
                                return(INVALIDEXCEPTION);
                        }
                        Set_invalidflag();
                        Dint_copytoptr(resultp1,resultp2,dstptr);
                        return(NOEXCEPTION);
                }
                Dint_set_minint(resultp1,resultp2);
                Dint_copytoptr(resultp1,resultp2,dstptr);
                return(NOEXCEPTION);
        }
        /*
         * Generate result
         */
        if (src_exponent >= 0) {
                temp = src;
                Sgl_clear_signexponent_set_hidden(temp);
                Dint_from_sgl_mantissa(temp,src_exponent,resultp1,resultp2);
                if (Sgl_isone_sign(src)) {
                        Dint_setone_sign(resultp1,resultp2);
                }
                Dint_copytoptr(resultp1,resultp2,dstptr);

                /* check for inexact */
                if (Sgl_isinexact_to_fix(src,src_exponent)) {
                        if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
                        else Set_inexactflag();
                }
        }
        else {
                Dint_setzero(resultp1,resultp2);
                Dint_copytoptr(resultp1,resultp2,dstptr);

                /* check for inexact */
                if (Sgl_isnotzero_exponentmantissa(src)) {
                        if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
                        else Set_inexactflag();
                }
        }
        return(NOEXCEPTION);
}

/*
 *  Double Floating-point to Single Fixed-point
 */
/*ARGSUSED*/
int
dbl_to_sgl_fcnvfxt(dbl_floating_point *srcptr, int *dstptr,
    unsigned int *status)
{
        register unsigned int srcp1, srcp2, tempp1, tempp2;
        register int src_exponent, result;

        Dbl_copyfromptr(srcptr,srcp1,srcp2);
        src_exponent = Dbl_exponent(srcp1) - DBL_BIAS;

        /*
         * Test for overflow
         */
        if (src_exponent > SGL_FX_MAX_EXP) {
                /* check for MININT */
                if (Dbl_isoverflow_to_int(src_exponent,srcp1,srcp2)) {
                        if (Dbl_iszero_sign(srcp1)) result = 0x7fffffff;
                        else result = 0x80000000;

                        if (Is_invalidtrap_enabled()) {
                                return(INVALIDEXCEPTION);
                        }
                        Set_invalidflag();
                        *dstptr = result;
                        return(NOEXCEPTION);
                }
        }
        /*
         * Generate result
         */
        if (src_exponent >= 0) {
                tempp1 = srcp1;
                tempp2 = srcp2;
                Dbl_clear_signexponent_set_hidden(tempp1);
                Int_from_dbl_mantissa(tempp1,tempp2,src_exponent);
                if (Dbl_isone_sign(srcp1) && (src_exponent <= SGL_FX_MAX_EXP))
                        result = -Dbl_allp1(tempp1);
                else result = Dbl_allp1(tempp1);
                *dstptr = result;

                /* check for inexact */
                if (Dbl_isinexact_to_fix(srcp1,srcp2,src_exponent)) {
                        if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
                        else Set_inexactflag();
                }
        }
        else {
                *dstptr = 0;

                /* check for inexact */
                if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) {
                        if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
                        else Set_inexactflag();
                }
        }
        return(NOEXCEPTION);
}

/*
 *  Double Floating-point to Double Fixed-point
 */
/*ARGSUSED*/
int
dbl_to_dbl_fcnvfxt(dbl_floating_point *srcptr, dbl_integer *dstptr,
    unsigned int *status)
{
        register int src_exponent, resultp1;
        register unsigned int srcp1, srcp2, tempp1, tempp2, resultp2;

        Dbl_copyfromptr(srcptr,srcp1,srcp2);
        src_exponent = Dbl_exponent(srcp1) - DBL_BIAS;

        /*
         * Test for overflow
         */
        if (src_exponent > DBL_FX_MAX_EXP) {
                /* check for MININT */
                if ((src_exponent > DBL_FX_MAX_EXP + 1) ||
                Dbl_isnotzero_mantissa(srcp1,srcp2) || Dbl_iszero_sign(srcp1)) {
                        if (Dbl_iszero_sign(srcp1)) {
                                resultp1 = 0x7fffffff;
                                resultp2 = 0xffffffff;
                        }
                        else {
                                resultp1 = 0x80000000;
                                resultp2 = 0;
                        }

                        if (Is_invalidtrap_enabled()) {
                                return(INVALIDEXCEPTION);
                        }
                        Set_invalidflag();
                        Dint_copytoptr(resultp1,resultp2,dstptr);
                        return(NOEXCEPTION);
                }
        }
        /*
         * Generate result
         */
        if (src_exponent >= 0) {
                tempp1 = srcp1;
                tempp2 = srcp2;
                Dbl_clear_signexponent_set_hidden(tempp1);
                Dint_from_dbl_mantissa(tempp1,tempp2,src_exponent,
                resultp1,resultp2);
                if (Dbl_isone_sign(srcp1)) {
                        Dint_setone_sign(resultp1,resultp2);
                }
                Dint_copytoptr(resultp1,resultp2,dstptr);

                /* check for inexact */
                if (Dbl_isinexact_to_fix(srcp1,srcp2,src_exponent)) {
                        if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
                        else Set_inexactflag();
                }
        }
        else {
                Dint_setzero(resultp1,resultp2);
                Dint_copytoptr(resultp1,resultp2,dstptr);

                /* check for inexact */
                if (Dbl_isnotzero_exponentmantissa(srcp1,srcp2)) {
                        if (Is_inexacttrap_enabled()) return(INEXACTEXCEPTION);
                        else Set_inexactflag();
                }
        }
        return(NOEXCEPTION);
}