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.
142 lines
3.4 KiB
142 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" |
|
|
|
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(struct roundingData *roundData, floatx80 rFn, floatx80 rFm) |
|
{ |
|
return floatx80_sub(roundData, rFm, rFn); |
|
} |
|
|
|
static floatx80 floatx80_rdv(struct roundingData *roundData, floatx80 rFn, floatx80 rFm) |
|
{ |
|
return floatx80_div(roundData, rFm, rFn); |
|
} |
|
|
|
static floatx80 (*const dyadic_extended[16])(struct roundingData*, 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(struct roundingData *roundData, floatx80 rFm) |
|
{ |
|
return rFm; |
|
} |
|
|
|
static floatx80 floatx80_mnf(struct roundingData *roundData, floatx80 rFm) |
|
{ |
|
rFm.high ^= 0x8000; |
|
return rFm; |
|
} |
|
|
|
static floatx80 floatx80_abs(struct roundingData *roundData, floatx80 rFm) |
|
{ |
|
rFm.high &= 0x7fff; |
|
return rFm; |
|
} |
|
|
|
static floatx80 (*const monadic_extended[16])(struct roundingData*, 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(struct roundingData *roundData, 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](roundData, rFn, rFm); |
|
} else { |
|
return 0; |
|
} |
|
} else { |
|
if (monadic_extended[opc_mask_shift]) { |
|
rFd->fExtended = monadic_extended[opc_mask_shift](roundData, rFm); |
|
} else { |
|
return 0; |
|
} |
|
} |
|
|
|
return 1; |
|
}
|
|
|