嵌入式Linux

开发平台：
Unix_Linux

single_cpdo.c：源码内容
							/*
    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"
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);
unsigned int SingleCPDO(const unsigned int opcode)
{
   FPA11 *fpa11 = GET_FPA11();
   float32 rFm, rFn;
   unsigned int Fd, Fm, Fn, nRc = 1;
   Fm = getFm(opcode);
   if (CONSTANT_FM(opcode))
   {
     rFm = getSingleConstant(Fm);
   }
   else
   {  
     switch (fpa11->fType[Fm])
     {
        case typeSingle:
          rFm = fpa11->fpreg[Fm].fSingle;
        break;
        
        default: return 0;
     }
   }
   if (!MONADIC_INSTRUCTION(opcode))
   {
      Fn = getFn(opcode);
      switch (fpa11->fType[Fn])
      {
        case typeSingle:
          rFn = fpa11->fpreg[Fn].fSingle;
        break;
        default: return 0;
      }
   }
   Fd = getFd(opcode);
   switch (opcode & MASK_ARITHMETIC_OPCODE)
   {
      /* dyadic opcodes */
      case ADF_CODE:
         fpa11->fpreg[Fd].fSingle = float32_add(rFn,rFm);
      break;
      case MUF_CODE:
      case FML_CODE:
        fpa11->fpreg[Fd].fSingle = float32_mul(rFn,rFm);
      break;
      case SUF_CODE:
         fpa11->fpreg[Fd].fSingle = float32_sub(rFn,rFm);
      break;
      case RSF_CODE:
         fpa11->fpreg[Fd].fSingle = float32_sub(rFm,rFn);
      break;
      case DVF_CODE:
      case FDV_CODE:
         fpa11->fpreg[Fd].fSingle = float32_div(rFn,rFm);
      break;
      case RDF_CODE:
      case FRD_CODE:
         fpa11->fpreg[Fd].fSingle = float32_div(rFm,rFn);
      break;
#if 0
      case POW_CODE:
         fpa11->fpreg[Fd].fSingle = float32_pow(rFn,rFm);
      break;
      case RPW_CODE:
         fpa11->fpreg[Fd].fSingle = float32_pow(rFm,rFn);
      break;
#endif
      case RMF_CODE:
         fpa11->fpreg[Fd].fSingle = float32_rem(rFn,rFm);
      break;
#if 0
      case POL_CODE:
         fpa11->fpreg[Fd].fSingle = float32_pol(rFn,rFm);
      break;
#endif
      /* monadic opcodes */
      case MVF_CODE:
         fpa11->fpreg[Fd].fSingle = rFm;
      break;
      case MNF_CODE:
         rFm ^= 0x80000000;
         fpa11->fpreg[Fd].fSingle = rFm;
      break;
      case ABS_CODE:
         rFm &= 0x7fffffff;
         fpa11->fpreg[Fd].fSingle = rFm;
      break;
      case RND_CODE:
      case URD_CODE:
         fpa11->fpreg[Fd].fSingle = float32_round_to_int(rFm);
      break;
      case SQT_CODE:
         fpa11->fpreg[Fd].fSingle = float32_sqrt(rFm);
      break;
#if 0
      case LOG_CODE:
         fpa11->fpreg[Fd].fSingle = float32_log(rFm);
      break;
      case LGN_CODE:
         fpa11->fpreg[Fd].fSingle = float32_ln(rFm);
      break;
      case EXP_CODE:
         fpa11->fpreg[Fd].fSingle = float32_exp(rFm);
      break;
      case SIN_CODE:
         fpa11->fpreg[Fd].fSingle = float32_sin(rFm);
      break;
      case COS_CODE:
         fpa11->fpreg[Fd].fSingle = float32_cos(rFm);
      break;
      case TAN_CODE:
         fpa11->fpreg[Fd].fSingle = float32_tan(rFm);
      break;
      case ASN_CODE:
         fpa11->fpreg[Fd].fSingle = float32_arcsin(rFm);
      break;
      case ACS_CODE:
         fpa11->fpreg[Fd].fSingle = float32_arccos(rFm);
      break;
      case ATN_CODE:
         fpa11->fpreg[Fd].fSingle = float32_arctan(rFm);
      break;
#endif
      case NRM_CODE:
      break;
      
      default:
      {
        nRc = 0;
      }
   }
   if (0 != nRc) fpa11->fType[Fd] = typeSingle;
   return nRc;
}
#if 0
float32 float32_exp(float32 Fm)
{
//series
}
float32 float32_ln(float32 Fm)
{
//series
}
float32 float32_sin(float32 rFm)
{
//series
}
float32 float32_cos(float32 rFm)
{
//series
}
float32 float32_arcsin(float32 rFm)
{
//series
}
float32 float32_arctan(float32 rFm)
{
  //series
}
float32 float32_arccos(float32 rFm)
{
   //return float32_sub(halfPi,float32_arcsin(rFm));
}
float32 float32_log(float32 rFm)
{
  return float32_div(float32_ln(rFm),getSingleConstant(7));
}
float32 float32_tan(float32 rFm)
{
  return float32_div(float32_sin(rFm),float32_cos(rFm));
}
float32 float32_pow(float32 rFn,float32 rFm)
{
  return float32_exp(float32_mul(rFm,float32_ln(rFn))); 
}
float32 float32_pol(float32 rFn,float32 rFm)
{
  return float32_arctan(float32_div(rFn,rFm)); 
}
#endif

						