Logo Search packages:      
Sourcecode: linux version File versions  Download package

single_cpdo.c

/*
    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(struct roundingData *roundData, float32 rFn, float32 rFm)
{
      return float32_sub(roundData, rFm, rFn);
}

static float32 float32_rdv(struct roundingData *roundData, float32 rFn, float32 rFm)
{
      return float32_div(roundData, rFm, rFn);
}

static float32 (*const dyadic_single[16])(struct roundingData *, 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(struct roundingData *roundData, float32 rFm)
{
      return rFm;
}

static float32 float32_mnf(struct roundingData *roundData, float32 rFm)
{
      return rFm ^ 0x80000000;
}

static float32 float32_abs(struct roundingData *roundData, float32 rFm)
{
      return rFm & 0x7fffffff;
}

static float32 (*const monadic_single[16])(struct roundingData*, 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(struct roundingData *roundData, 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](roundData, rFn, rFm);
            } else {
                  return 0;
            }
      } else {
            if (monadic_single[opc_mask_shift]) {
                  rFd->fSingle = monadic_single[opc_mask_shift](roundData, rFm);
            } else {
                  return 0;
            }
      }

      return 1;
}

Generated by  Doxygen 1.6.0   Back to index