diff options
Diffstat (limited to 'arch/arm/nwfpe/double_cpdo.c')
| -rw-r--r-- | arch/arm/nwfpe/double_cpdo.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/arch/arm/nwfpe/double_cpdo.c b/arch/arm/nwfpe/double_cpdo.c new file mode 100644 index 00000000000..7ffd8cb9bc9 --- /dev/null +++ b/arch/arm/nwfpe/double_cpdo.c @@ -0,0 +1,167 @@ +/* + 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; +} |