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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"
union float64_components {
float64 f64;
unsigned int i[2];
};
float64 float64_exp(float64 Fm);
float64 float64_ln(float64 Fm);
float64 float64_sin(float64 rFm);
float64 float64_cos(float64 rFm);
float64 float64_arcsin(float64 rFm);
float64 float64_arctan(float64 rFm);
float64 float64_log(float64 rFm);
float64 float64_tan(float64 rFm);
float64 float64_arccos(float64 rFm);
float64 float64_pow(float64 rFn, float64 rFm);
float64 float64_pol(float64 rFn, float64 rFm);
static float64 float64_rsf(float64 rFn, float64 rFm)
{
return float64_sub(rFm, rFn);
}
static float64 float64_rdv(float64 rFn, float64 rFm)
{
return float64_div(rFm, rFn);
}
static float64 (*const dyadic_double[16])(float64 rFn, float64 rFm) = {
[ADF_CODE >> 20] = float64_add,
[MUF_CODE >> 20] = float64_mul,
[SUF_CODE >> 20] = float64_sub,
[RSF_CODE >> 20] = float64_rsf,
[DVF_CODE >> 20] = float64_div,
[RDF_CODE >> 20] = float64_rdv,
[RMF_CODE >> 20] = float64_rem,
/* strictly, these opcodes should not be implemented */
[FML_CODE >> 20] = float64_mul,
[FDV_CODE >> 20] = float64_div,
[FRD_CODE >> 20] = float64_rdv,
};
static float64 float64_mvf(float64 rFm)
{
return rFm;
}
static float64 float64_mnf(float64 rFm)
{
union float64_components u;
u.f64 = rFm;
#ifdef __ARMEB__
u.i[0] ^= 0x80000000;
#else
u.i[1] ^= 0x80000000;
#endif
return u.f64;
}
static float64 float64_abs(float64 rFm)
{
union float64_components u;
u.f64 = rFm;
#ifdef __ARMEB__
u.i[0] &= 0x7fffffff;
#else
u.i[1] &= 0x7fffffff;
#endif
return u.f64;
}
static float64 (*const monadic_double[16])(float64 rFm) = {
[MVF_CODE >> 20] = float64_mvf,
[MNF_CODE >> 20] = float64_mnf,
[ABS_CODE >> 20] = float64_abs,
[RND_CODE >> 20] = float64_round_to_int,
[URD_CODE >> 20] = float64_round_to_int,
[SQT_CODE >> 20] = float64_sqrt,
[NRM_CODE >> 20] = float64_mvf,
};
unsigned int DoubleCPDO(const unsigned int opcode, FPREG * rFd)
{
FPA11 *fpa11 = GET_FPA11();
float64 rFm;
unsigned int Fm, opc_mask_shift;
Fm = getFm(opcode);
if (CONSTANT_FM(opcode)) {
rFm = getDoubleConstant(Fm);
} else {
switch (fpa11->fType[Fm]) {
case typeSingle:
rFm = float32_to_float64(fpa11->fpreg[Fm].fSingle);
break;
case typeDouble:
rFm = fpa11->fpreg[Fm].fDouble;
break;
default:
return 0;
}
}
opc_mask_shift = (opcode & MASK_ARITHMETIC_OPCODE) >> 20;
if (!MONADIC_INSTRUCTION(opcode)) {
unsigned int Fn = getFn(opcode);
float64 rFn;
switch (fpa11->fType[Fn]) {
case typeSingle:
rFn = float32_to_float64(fpa11->fpreg[Fn].fSingle);
break;
case typeDouble:
rFn = fpa11->fpreg[Fn].fDouble;
break;
default:
return 0;
}
if (dyadic_double[opc_mask_shift]) {
rFd->fDouble = dyadic_double[opc_mask_shift](rFn, rFm);
} else {
return 0;
}
} else {
if (monadic_double[opc_mask_shift]) {
rFd->fDouble = monadic_double[opc_mask_shift](rFm);
} else {
return 0;
}
}
return 1;
}
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