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/*

    NetWinder Floating Point Emulator

    (c) Rebel.COM, 1998,1999

    (c) Philip Blundell, 2001

    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"

float32 float32_exp(float32 Fm);

float32 float32_ln(float32 Fm);

float32 float32_sin(float32 rFm);

float32 float32_cos(float32 rFm);

float32 float32_arcsin(float32 rFm);

float32 float32_arctan(float32 rFm);

float32 float32_log(float32 rFm);

float32 float32_tan(float32 rFm);

float32 float32_arccos(float32 rFm);

float32 float32_pow(float32 rFn, float32 rFm);

float32 float32_pol(float32 rFn, float32 rFm);

static float32 float32_rsf(float32 rFn, float32 rFm)

{

        return float32_sub(rFm, rFn);

}

static float32 float32_rdv(float32 rFn, float32 rFm)

{

        return float32_div(rFm, rFn);

}

static float32 (*const dyadic_single[16])(float32 rFn, float32 rFm) = {

        [ADF_CODE >> 20] = float32_add,

        [MUF_CODE >> 20] = float32_mul,

        [SUF_CODE >> 20] = float32_sub,

        [RSF_CODE >> 20] = float32_rsf,

        [DVF_CODE >> 20] = float32_div,

        [RDF_CODE >> 20] = float32_rdv,

        [RMF_CODE >> 20] = float32_rem,

        [FML_CODE >> 20] = float32_mul,

        [FDV_CODE >> 20] = float32_div,

        [FRD_CODE >> 20] = float32_rdv,

};

static float32 float32_mvf(float32 rFm)

{

        return rFm;

}

static float32 float32_mnf(float32 rFm)

{

        return rFm ^ 0x80000000;

}

static float32 float32_abs(float32 rFm)

{

        return rFm & 0x7fffffff;

}

static float32 (*const monadic_single[16])(float32 rFm) = {

        [MVF_CODE >> 20] = float32_mvf,

        [MNF_CODE >> 20] = float32_mnf,

        [ABS_CODE >> 20] = float32_abs,

        [RND_CODE >> 20] = float32_round_to_int,

        [URD_CODE >> 20] = float32_round_to_int,

        [SQT_CODE >> 20] = float32_sqrt,

        [NRM_CODE >> 20] = float32_mvf,

};

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

{

        FPA11 *fpa11 = GET_FPA11();

        float32 rFm;

        unsigned int Fm, opc_mask_shift;

        Fm = getFm(opcode);

        if (CONSTANT_FM(opcode)) {

                rFm = getSingleConstant(Fm);

        } else if (fpa11->fType[Fm] == typeSingle) {

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

        } else {

                return 0;

        }

        opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;

        if (!MONADIC_INSTRUCTION(opcode)) {

                unsigned int Fn = getFn(opcode);

                float32 rFn;

                if (fpa11->fType[Fn] == typeSingle &&

                    dyadic_single[opc_mask_shift]) {

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

                        rFd->fSingle = dyadic_single[opc_mask_shift](rFn, rFm);

                } else {

                        return 0;

                }

        } else {

                if (monadic_single[opc_mask_shift]) {

                        rFd->fSingle = monadic_single[opc_mask_shift](rFm);

                } else {

                        return 0;

                }

        }

        return 1;

}