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/*

    NetWinder Floating Point Emulator

    (c) Rebel.COM, 1998,1999

    Direct questions, comments to Scott Bambrough <scottb@netwinder.org>

    This program is free software; you can redistribute it and/or modify

    it under the terms of the GNU General Public License as published by

    the Free Software Foundation; either version 2 of the License, or

    (at your option) any later version.

    This program is distributed in the hope that it will be useful,

    but WITHOUT ANY WARRANTY; without even the implied warranty of

    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License

    along with this program; if not, write to the Free Software

    Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

*/

#include "fpa11.h"

#include "softfloat.h"

#include "fpopcode.h"

union float64_components {

        float64 f64;

        unsigned int i[2];

};

float64 float64_exp(float64 Fm);

float64 float64_ln(float64 Fm);

float64 float64_sin(float64 rFm);

float64 float64_cos(float64 rFm);

float64 float64_arcsin(float64 rFm);

float64 float64_arctan(float64 rFm);

float64 float64_log(float64 rFm);

float64 float64_tan(float64 rFm);

float64 float64_arccos(float64 rFm);

float64 float64_pow(float64 rFn, float64 rFm);

float64 float64_pol(float64 rFn, float64 rFm);

static float64 float64_rsf(float64 rFn, float64 rFm)

{

        return float64_sub(rFm, rFn);

}

static float64 float64_rdv(float64 rFn, float64 rFm)

{

        return float64_div(rFm, rFn);

}

static float64 (*const dyadic_double[16])(float64 rFn, float64 rFm) = {

        [ADF_CODE >> 20] = float64_add,

        [MUF_CODE >> 20] = float64_mul,

        [SUF_CODE >> 20] = float64_sub,

        [RSF_CODE >> 20] = float64_rsf,

        [DVF_CODE >> 20] = float64_div,

        [RDF_CODE >> 20] = float64_rdv,

        [RMF_CODE >> 20] = float64_rem,

        /* strictly, these opcodes should not be implemented */

        [FML_CODE >> 20] = float64_mul,

        [FDV_CODE >> 20] = float64_div,

        [FRD_CODE >> 20] = float64_rdv,

};

static float64 float64_mvf(float64 rFm)

{

        return rFm;

}

static float64 float64_mnf(float64 rFm)

{

        union float64_components u;

        u.f64 = rFm;

        u.i[1] ^= 0x80000000;

        return u.f64;

}

static float64 float64_abs(float64 rFm)

{

        union float64_components u;

        u.f64 = rFm;

        u.i[1] &= 0x7fffffff;

        return u.f64;

}

static float64 (*const monadic_double[16])(float64 rFm) = {

        [MVF_CODE >> 20] = float64_mvf,

        [MNF_CODE >> 20] = float64_mnf,

        [ABS_CODE >> 20] = float64_abs,

        [RND_CODE >> 20] = float64_round_to_int,

        [URD_CODE >> 20] = float64_round_to_int,

        [SQT_CODE >> 20] = float64_sqrt,

        [NRM_CODE >> 20] = float64_mvf,

};

unsigned int DoubleCPDO(const unsigned int opcode, FPREG * rFd)

{

        FPA11 *fpa11 = GET_FPA11();

        float64 rFm;

        unsigned int Fm, opc_mask_shift;

        Fm = getFm(opcode);

        if (CONSTANT_FM(opcode)) {

                rFm = getDoubleConstant(Fm);

        } else {

                switch (fpa11->fType[Fm]) {

                case typeSingle:

                        rFm = float32_to_float64(fpa11->fpreg[Fm].fSingle);

                        break;

                case typeDouble:

                        rFm = fpa11->fpreg[Fm].fDouble;

                        break;

                default:

                        return 0;

                }

        }

        opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;

        if (!MONADIC_INSTRUCTION(opcode)) {

                unsigned int Fn = getFn(opcode);

                float64 rFn;

                switch (fpa11->fType[Fn]) {

                case typeSingle:

                        rFn = float32_to_float64(fpa11->fpreg[Fn].fSingle);

                        break;

                case typeDouble:

                        rFn = fpa11->fpreg[Fn].fDouble;

                        break;

                default:

                        return 0;

                }

                if (dyadic_double[opc_mask_shift]) {

                        rFd->fDouble = dyadic_double[opc_mask_shift](rFn, rFm);

                } else {

                        return 0;

                }

        } else {

                if (monadic_double[opc_mask_shift]) {

                        rFd->fDouble = monadic_double[opc_mask_shift](rFm);

                } else {

                        return 0;

                }

        }

        return 1;

}