289 строки
6.1 KiB
C
289 строки
6.1 KiB
C
/*
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NetWinder Floating Point Emulator
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(c) Rebel.COM, 1998,1999
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Direct questions, comments to Scott Bambrough <scottb@netwinder.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include "fpa11.h"
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#include "softfloat.h"
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#include "fpopcode.h"
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float64 float64_exp(float64 Fm);
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float64 float64_ln(float64 Fm);
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float64 float64_sin(float64 rFm);
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float64 float64_cos(float64 rFm);
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float64 float64_arcsin(float64 rFm);
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float64 float64_arctan(float64 rFm);
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float64 float64_log(float64 rFm);
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float64 float64_tan(float64 rFm);
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float64 float64_arccos(float64 rFm);
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float64 float64_pow(float64 rFn,float64 rFm);
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float64 float64_pol(float64 rFn,float64 rFm);
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unsigned int DoubleCPDO(const unsigned int opcode)
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{
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FPA11 *fpa11 = GET_FPA11();
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float64 rFm, rFn = 0; //FIXME - should be zero?
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unsigned int Fd, Fm, Fn, nRc = 1;
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//printk("DoubleCPDO(0x%08x)\n",opcode);
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Fm = getFm(opcode);
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if (CONSTANT_FM(opcode))
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{
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rFm = getDoubleConstant(Fm);
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}
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else
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{
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switch (fpa11->fType[Fm])
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{
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case typeSingle:
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rFm = float32_to_float64(fpa11->fpreg[Fm].fSingle);
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break;
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case typeDouble:
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rFm = fpa11->fpreg[Fm].fDouble;
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break;
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case typeExtended:
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// !! patb
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//printk("not implemented! why not?\n");
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//!! ScottB
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// should never get here, if extended involved
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// then other operand should be promoted then
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// ExtendedCPDO called.
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break;
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default: return 0;
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}
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}
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if (!MONADIC_INSTRUCTION(opcode))
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{
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Fn = getFn(opcode);
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switch (fpa11->fType[Fn])
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{
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case typeSingle:
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rFn = float32_to_float64(fpa11->fpreg[Fn].fSingle);
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break;
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case typeDouble:
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rFn = fpa11->fpreg[Fn].fDouble;
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break;
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default: return 0;
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}
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}
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Fd = getFd(opcode);
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/* !! this switch isn't optimized; better (opcode & MASK_ARITHMETIC_OPCODE)>>24, sort of */
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switch (opcode & MASK_ARITHMETIC_OPCODE)
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{
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/* dyadic opcodes */
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case ADF_CODE:
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fpa11->fpreg[Fd].fDouble = float64_add(rFn,rFm);
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break;
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case MUF_CODE:
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case FML_CODE:
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fpa11->fpreg[Fd].fDouble = float64_mul(rFn,rFm);
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break;
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case SUF_CODE:
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fpa11->fpreg[Fd].fDouble = float64_sub(rFn,rFm);
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break;
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case RSF_CODE:
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fpa11->fpreg[Fd].fDouble = float64_sub(rFm,rFn);
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break;
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case DVF_CODE:
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case FDV_CODE:
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fpa11->fpreg[Fd].fDouble = float64_div(rFn,rFm);
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break;
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case RDF_CODE:
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case FRD_CODE:
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fpa11->fpreg[Fd].fDouble = float64_div(rFm,rFn);
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break;
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#if 0
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case POW_CODE:
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fpa11->fpreg[Fd].fDouble = float64_pow(rFn,rFm);
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break;
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case RPW_CODE:
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fpa11->fpreg[Fd].fDouble = float64_pow(rFm,rFn);
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break;
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#endif
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case RMF_CODE:
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fpa11->fpreg[Fd].fDouble = float64_rem(rFn,rFm);
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break;
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#if 0
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case POL_CODE:
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fpa11->fpreg[Fd].fDouble = float64_pol(rFn,rFm);
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break;
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#endif
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/* monadic opcodes */
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case MVF_CODE:
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fpa11->fpreg[Fd].fDouble = rFm;
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break;
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case MNF_CODE:
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{
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unsigned int *p = (unsigned int*)&rFm;
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p[1] ^= 0x80000000;
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fpa11->fpreg[Fd].fDouble = rFm;
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}
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break;
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case ABS_CODE:
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{
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unsigned int *p = (unsigned int*)&rFm;
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p[1] &= 0x7fffffff;
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fpa11->fpreg[Fd].fDouble = rFm;
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}
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break;
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case RND_CODE:
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case URD_CODE:
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fpa11->fpreg[Fd].fDouble = float64_round_to_int(rFm);
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break;
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case SQT_CODE:
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fpa11->fpreg[Fd].fDouble = float64_sqrt(rFm);
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break;
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#if 0
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case LOG_CODE:
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fpa11->fpreg[Fd].fDouble = float64_log(rFm);
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break;
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case LGN_CODE:
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fpa11->fpreg[Fd].fDouble = float64_ln(rFm);
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break;
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case EXP_CODE:
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fpa11->fpreg[Fd].fDouble = float64_exp(rFm);
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break;
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case SIN_CODE:
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fpa11->fpreg[Fd].fDouble = float64_sin(rFm);
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break;
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case COS_CODE:
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fpa11->fpreg[Fd].fDouble = float64_cos(rFm);
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break;
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case TAN_CODE:
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fpa11->fpreg[Fd].fDouble = float64_tan(rFm);
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break;
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case ASN_CODE:
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fpa11->fpreg[Fd].fDouble = float64_arcsin(rFm);
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break;
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case ACS_CODE:
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fpa11->fpreg[Fd].fDouble = float64_arccos(rFm);
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break;
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case ATN_CODE:
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fpa11->fpreg[Fd].fDouble = float64_arctan(rFm);
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break;
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#endif
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case NRM_CODE:
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break;
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default:
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{
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nRc = 0;
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}
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}
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if (0 != nRc) fpa11->fType[Fd] = typeDouble;
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return nRc;
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}
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#if 0
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float64 float64_exp(float64 rFm)
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{
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return rFm;
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//series
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}
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float64 float64_ln(float64 rFm)
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{
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return rFm;
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//series
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}
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float64 float64_sin(float64 rFm)
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{
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return rFm;
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//series
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}
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float64 float64_cos(float64 rFm)
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{
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return rFm;
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//series
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}
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#if 0
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float64 float64_arcsin(float64 rFm)
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{
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//series
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}
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float64 float64_arctan(float64 rFm)
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{
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//series
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}
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#endif
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float64 float64_log(float64 rFm)
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{
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return float64_div(float64_ln(rFm),getDoubleConstant(7));
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}
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float64 float64_tan(float64 rFm)
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{
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return float64_div(float64_sin(rFm),float64_cos(rFm));
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}
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float64 float64_arccos(float64 rFm)
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{
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return rFm;
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//return float64_sub(halfPi,float64_arcsin(rFm));
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}
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float64 float64_pow(float64 rFn,float64 rFm)
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{
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return float64_exp(float64_mul(rFm,float64_ln(rFn)));
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}
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float64 float64_pol(float64 rFn,float64 rFm)
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{
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return float64_arctan(float64_div(rFn,rFm));
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}
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#endif
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