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/*
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(floatx80 rFn, floatx80 rFm)
{
return floatx80_sub(rFm, rFn);
}
static floatx80 floatx80_rdv(floatx80 rFn, floatx80 rFm)
{
return floatx80_div(rFm, rFn);
}
static floatx80 (*const dyadic_extended[16])(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(floatx80 rFm)
{
return rFm;
}
static floatx80 floatx80_mnf(floatx80 rFm)
{
rFm.high ^= 0x8000;
return rFm;
}
static floatx80 floatx80_abs(floatx80 rFm)
{
rFm.high &= 0x7fff;
return rFm;
}
static floatx80 (*const monadic_extended[16])(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(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](rFn, rFm);
} else {
return 0;
}
} else {
if (monadic_extended[opc_mask_shift]) {
rFd->fExtended = monadic_extended[opc_mask_shift](rFm);
} else {
return 0;
}
}
return 1;
}
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