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extended_cpdo.c

/*
    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"

floatx80 floatx80_exp(floatx80 Fm);
floatx80 floatx80_ln(floatx80 Fm);
floatx80 floatx80_sin(floatx80 rFm);
floatx80 floatx80_cos(floatx80 rFm);
floatx80 floatx80_arcsin(floatx80 rFm);
floatx80 floatx80_arctan(floatx80 rFm);
floatx80 floatx80_log(floatx80 rFm);
floatx80 floatx80_tan(floatx80 rFm);
floatx80 floatx80_arccos(floatx80 rFm);
floatx80 floatx80_pow(floatx80 rFn, floatx80 rFm);
floatx80 floatx80_pol(floatx80 rFn, floatx80 rFm);

static floatx80 floatx80_rsf(struct roundingData *roundData, floatx80 rFn, floatx80 rFm)
{
      return floatx80_sub(roundData, rFm, rFn);
}

static floatx80 floatx80_rdv(struct roundingData *roundData, floatx80 rFn, floatx80 rFm)
{
      return floatx80_div(roundData, rFm, rFn);
}

static floatx80 (*const dyadic_extended[16])(struct roundingData*, floatx80 rFn, floatx80 rFm) = {
      [ADF_CODE >> 20] = floatx80_add,
      [MUF_CODE >> 20] = floatx80_mul,
      [SUF_CODE >> 20] = floatx80_sub,
      [RSF_CODE >> 20] = floatx80_rsf,
      [DVF_CODE >> 20] = floatx80_div,
      [RDF_CODE >> 20] = floatx80_rdv,
      [RMF_CODE >> 20] = floatx80_rem,

      /* strictly, these opcodes should not be implemented */
      [FML_CODE >> 20] = floatx80_mul,
      [FDV_CODE >> 20] = floatx80_div,
      [FRD_CODE >> 20] = floatx80_rdv,
};

static floatx80 floatx80_mvf(struct roundingData *roundData, floatx80 rFm)
{
      return rFm;
}

static floatx80 floatx80_mnf(struct roundingData *roundData, floatx80 rFm)
{
      rFm.high ^= 0x8000;
      return rFm;
}

static floatx80 floatx80_abs(struct roundingData *roundData, floatx80 rFm)
{
      rFm.high &= 0x7fff;
      return rFm;
}

static floatx80 (*const monadic_extended[16])(struct roundingData*, floatx80 rFm) = {
      [MVF_CODE >> 20] = floatx80_mvf,
      [MNF_CODE >> 20] = floatx80_mnf,
      [ABS_CODE >> 20] = floatx80_abs,
      [RND_CODE >> 20] = floatx80_round_to_int,
      [URD_CODE >> 20] = floatx80_round_to_int,
      [SQT_CODE >> 20] = floatx80_sqrt,
      [NRM_CODE >> 20] = floatx80_mvf,
};

unsigned int ExtendedCPDO(struct roundingData *roundData, const unsigned int opcode, FPREG * rFd)
{
      FPA11 *fpa11 = GET_FPA11();
      floatx80 rFm;
      unsigned int Fm, opc_mask_shift;

      Fm = getFm(opcode);
      if (CONSTANT_FM(opcode)) {
            rFm = getExtendedConstant(Fm);
      } else {
            switch (fpa11->fType[Fm]) {
            case typeSingle:
                  rFm = float32_to_floatx80(fpa11->fpreg[Fm].fSingle);
                  break;

            case typeDouble:
                  rFm = float64_to_floatx80(fpa11->fpreg[Fm].fDouble);
                  break;

            case typeExtended:
                  rFm = fpa11->fpreg[Fm].fExtended;
                  break;

            default:
                  return 0;
            }
      }

      opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
      if (!MONADIC_INSTRUCTION(opcode)) {
            unsigned int Fn = getFn(opcode);
            floatx80 rFn;

            switch (fpa11->fType[Fn]) {
            case typeSingle:
                  rFn = float32_to_floatx80(fpa11->fpreg[Fn].fSingle);
                  break;

            case typeDouble:
                  rFn = float64_to_floatx80(fpa11->fpreg[Fn].fDouble);
                  break;

            case typeExtended:
                  rFn = fpa11->fpreg[Fn].fExtended;
                  break;

            default:
                  return 0;
            }

            if (dyadic_extended[opc_mask_shift]) {
                  rFd->fExtended = dyadic_extended[opc_mask_shift](roundData, rFn, rFm);
            } else {
                  return 0;
            }
      } else {
            if (monadic_extended[opc_mask_shift]) {
                  rFd->fExtended = monadic_extended[opc_mask_shift](roundData, rFm);
            } else {
                  return 0;
            }
      }

      return 1;
}

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