mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
155 lines
3.4 KiB
155 lines
3.4 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
|
/* |
|
NetWinder Floating Point Emulator |
|
(c) Rebel.COM, 1998,1999 |
|
|
|
Direct questions, comments to Scott Bambrough <[email protected]> |
|
|
|
*/ |
|
|
|
#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(struct roundingData *roundData, float64 rFn, float64 rFm) |
|
{ |
|
return float64_sub(roundData, rFm, rFn); |
|
} |
|
|
|
static float64 float64_rdv(struct roundingData *roundData, float64 rFn, float64 rFm) |
|
{ |
|
return float64_div(roundData, rFm, rFn); |
|
} |
|
|
|
static float64 (*const dyadic_double[16])(struct roundingData*, 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(struct roundingData *roundData,float64 rFm) |
|
{ |
|
return rFm; |
|
} |
|
|
|
static float64 float64_mnf(struct roundingData *roundData,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(struct roundingData *roundData,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])(struct roundingData *, 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(struct roundingData *roundData, 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](roundData, rFn, rFm); |
|
} else { |
|
return 0; |
|
} |
|
} else { |
|
if (monadic_double[opc_mask_shift]) { |
|
rFd->fDouble = monadic_double[opc_mask_shift](roundData, rFm); |
|
} else { |
|
return 0; |
|
} |
|
} |
|
|
|
return 1; |
|
}
|
|
|