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Diffstat (limited to 'arch/arm/nwfpe/extended_cpdo.c')
| -rw-r--r-- | arch/arm/nwfpe/extended_cpdo.c | 154 |
1 files changed, 154 insertions, 0 deletions
diff --git a/arch/arm/nwfpe/extended_cpdo.c b/arch/arm/nwfpe/extended_cpdo.c new file mode 100644 index 0000000..c39f68a --- /dev/null +++ b/arch/arm/nwfpe/extended_cpdo.c @@ -0,0 +1,154 @@ +/* + 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; +} |
