circuitpython/py/objfloat.c at pdm · ProGamerCode/circuitpython · GitHub

History

319 lines (285 loc) · 10.7 KB

Raw

100

101

102

103

104

105

106

107

108

109

110

111

112

113

114

115

116

117

118

119

120

121

122

123

124

125

126

127

128

129

130

131

132

133

134

135

136

137

138

139

140

141

142

143

144

145

146

147

148

149

150

151

152

153

154

155

156

157

158

159

160

161

162

163

164

165

166

167

168

169

170

171

172

173

174

175

176

177

178

179

180

181

182

183

184

185

186

187

188

189

190

191

192

193

194

195

196

197

198

199

200

201

202

203

204

205

206

207

208

209

210

211

212

213

214

215

216

217

218

219

220

221

222

223

224

225

226

227

228

229

230

231

232

233

234

235

236

237

238

239

240

241

242

243

244

245

246

247

248

249

250

251

252

253

254

255

256

257

258

259

260

261

262

263

264

265

266

267

268

269

270

271

272

273

274

275

276

277

278

279

280

281

282

283

284

285

286

287

288

289

290

291

292

293

294

295

296

297

298

299

300

301

302

303

304

305

306

307

308

309

310

311

312

313

314

315

316

317

318

319

* This file is part of the Micro Python project, http://micropython.org/

* The MIT License (MIT)

* Permission is hereby granted, free of charge, to any person obtaining a copy

* of this software and associated documentation files (the "Software"), to deal

* in the Software without restriction, including without limitation the rights

* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell

* copies of the Software, and to permit persons to whom the Software is

* furnished to do so, subject to the following conditions:

* The above copyright notice and this permission notice shall be included in

* all copies or substantial portions of the Software.

* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE

* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,

* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN

* THE SOFTWARE.

#include <stdlib.h>

#include <stdio.h>

#include <string.h>

#include <assert.h>

#include "py/nlr.h"

#include "py/parsenum.h"

#include "py/runtime0.h"

#include "py/runtime.h"

#if MICROPY_PY_BUILTINS_FLOAT

#include <math.h>

#include "py/formatfloat.h"

#pragma GCC diagnostic push

#pragma GCC diagnostic ignored "-Wfloat-equal"

#if MICROPY_OBJ_REPR != MICROPY_OBJ_REPR_C && MICROPY_OBJ_REPR != MICROPY_OBJ_REPR_D

// M_E and M_PI are not part of the math.h standard and may not be defined

#ifndef M_E

#define M_E (2.7182818284590452354)

#endif

#ifndef M_PI

#define M_PI (3.14159265358979323846)

#endif

typedef struct _mp_obj_float_t {

mp_obj_base_t base;

mp_float_t value;

} mp_obj_float_t;

const mp_obj_float_t mp_const_float_e_obj = {{&mp_type_float}, M_E};

const mp_obj_float_t mp_const_float_pi_obj = {{&mp_type_float}, M_PI};

#endif

#if MICROPY_FLOAT_HIGH_QUALITY_HASH

// must return actual integer value if it fits in mp_int_t

mp_int_t mp_float_hash(mp_float_t src) {

#if MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_DOUBLE

typedef uint64_t mp_float_uint_t;

#elif MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_FLOAT

typedef uint32_t mp_float_uint_t;

#endif

union {

mp_float_t f;

#if MP_ENDIANNESS_LITTLE

struct { mp_float_uint_t frc:MP_FLOAT_FRAC_BITS, exp:MP_FLOAT_EXP_BITS, sgn:1; } p;

#else

struct { mp_float_uint_t sgn:1, exp:MP_FLOAT_EXP_BITS, frc:MP_FLOAT_FRAC_BITS; } p;

#endif

mp_float_uint_t i;

} u = {.f = src};

mp_int_t val;

const int adj_exp = (int)u.p.exp - MP_FLOAT_EXP_BIAS;

if (adj_exp < 0) {

// value < 1; must be sure to handle 0.0 correctly (ie return 0)

val = u.i;

} else {

// if adj_exp is max then: u.p.frc==0 indicates inf, else NaN

// else: 1 <= value

mp_float_uint_t frc = u.p.frc | ((mp_float_uint_t)1 << MP_FLOAT_FRAC_BITS);

if (adj_exp <= MP_FLOAT_FRAC_BITS) {

// number may have a fraction; xor the integer part with the fractional part

val = (frc >> (MP_FLOAT_FRAC_BITS - adj_exp))

^ (frc & ((1 << (MP_FLOAT_FRAC_BITS - adj_exp)) - 1));

} else if ((unsigned int)adj_exp < BITS_PER_BYTE * sizeof(mp_int_t) - 1) {

// the number is a (big) whole integer and will fit in val's signed-width

val = (mp_int_t)frc << (adj_exp - MP_FLOAT_FRAC_BITS);

} else {

// integer part will overflow val's width so just use what bits we can

val = frc;

}

if (u.p.sgn) {

val = -val;

}

return val;

}

#endif

STATIC void float_print(const mp_print_t *print, mp_obj_t o_in, mp_print_kind_t kind) {

(void)kind;

mp_float_t o_val = mp_obj_float_get(o_in);

#if MICROPY_FLOAT_IMPL == MICROPY_FLOAT_IMPL_FLOAT

char buf[16];

#if MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_C

const int precision = 6;

#else

const int precision = 7;

#endif

#else

char buf[32];

const int precision = 16;

#endif

mp_format_float(o_val, buf, sizeof(buf), 'g', precision, '\0');

mp_print_str(print, buf);

if (strchr(buf, '.') == NULL && strchr(buf, 'e') == NULL && strchr(buf, 'n') == NULL) {

// Python floats always have decimal point (unless inf or nan)

mp_print_str(print, ".0");

}

STATIC mp_obj_t float_make_new(const mp_obj_type_t *type_in, size_t n_args, size_t n_kw, const mp_obj_t *args) {

(void)type_in;

mp_arg_check_num(n_args, n_kw, 0, 1, false);

switch (n_args) {

case 0:

return mp_obj_new_float(0);

case 1:

default:

if (MP_OBJ_IS_STR(args[0])) {

// a string, parse it

size_t l;

const char *s = mp_obj_str_get_data(args[0], &l);

return mp_parse_num_decimal(s, l, false, false, NULL);

} else if (mp_obj_is_float(args[0])) {

// a float, just return it

return args[0];

} else {

// something else, try to cast it to a float

return mp_obj_new_float(mp_obj_get_float(args[0]));

}

STATIC mp_obj_t float_unary_op(mp_uint_t op, mp_obj_t o_in) {

mp_float_t val = mp_obj_float_get(o_in);

switch (op) {

case MP_UNARY_OP_BOOL: return mp_obj_new_bool(val != 0);

case MP_UNARY_OP_HASH: return MP_OBJ_NEW_SMALL_INT(mp_float_hash(val));

case MP_UNARY_OP_POSITIVE: return o_in;

case MP_UNARY_OP_NEGATIVE: return mp_obj_new_float(-val);

default: return MP_OBJ_NULL; // op not supported

}

STATIC mp_obj_t float_binary_op(mp_uint_t op, mp_obj_t lhs_in, mp_obj_t rhs_in) {

mp_float_t lhs_val = mp_obj_float_get(lhs_in);

#if MICROPY_PY_BUILTINS_COMPLEX

if (MP_OBJ_IS_TYPE(rhs_in, &mp_type_complex)) {

return mp_obj_complex_binary_op(op, lhs_val, 0, rhs_in);

} else

#endif

{

return mp_obj_float_binary_op(op, lhs_val, rhs_in);

}

const mp_obj_type_t mp_type_float = {

{ &mp_type_type },

.name = MP_QSTR_float,

.print = float_print,

.make_new = float_make_new,

.unary_op = float_unary_op,

.binary_op = float_binary_op,

};

#if MICROPY_OBJ_REPR != MICROPY_OBJ_REPR_C && MICROPY_OBJ_REPR != MICROPY_OBJ_REPR_D

mp_obj_t mp_obj_new_float(mp_float_t value) {

mp_obj_float_t *o = m_new(mp_obj_float_t, 1);

o->base.type = &mp_type_float;

o->value = value;

return MP_OBJ_FROM_PTR(o);

}

mp_float_t mp_obj_float_get(mp_obj_t self_in) {

assert(mp_obj_is_float(self_in));

mp_obj_float_t *self = MP_OBJ_TO_PTR(self_in);

return self->value;

}

#endif

STATIC void mp_obj_float_divmod(mp_float_t *x, mp_float_t *y) {

// logic here follows that of CPython

// https://docs.python.org/3/reference/expressions.html#binary-arithmetic-operations

// x == (x//y)*y + (x%y)

// divmod(x, y) == (x//y, x%y)

mp_float_t mod = MICROPY_FLOAT_C_FUN(fmod)(*x, *y);

mp_float_t div = (*x - mod) / *y;

// Python specs require that mod has same sign as second operand

if (mod == 0.0) {

mod = MICROPY_FLOAT_C_FUN(copysign)(0.0, *y);

} else {

if ((mod < 0.0) != (*y < 0.0)) {

mod += *y;

div -= 1.0;

}

mp_float_t floordiv;

if (div == 0.0) {

// if division is zero, take the correct sign of zero

floordiv = MICROPY_FLOAT_C_FUN(copysign)(0.0, *x / *y);

} else {

// Python specs require that x == (x//y)*y + (x%y)

floordiv = MICROPY_FLOAT_C_FUN(floor)(div);

if (div - floordiv > 0.5) {

floordiv += 1.0;

}

// return results

*x = floordiv;

*y = mod;

}

mp_obj_t mp_obj_float_binary_op(mp_uint_t op, mp_float_t lhs_val, mp_obj_t rhs_in) {

mp_float_t rhs_val = mp_obj_get_float(rhs_in); // can be any type, this function will convert to float (if possible)

switch (op) {

case MP_BINARY_OP_ADD:

case MP_BINARY_OP_INPLACE_ADD: lhs_val += rhs_val; break;

case MP_BINARY_OP_SUBTRACT:

case MP_BINARY_OP_INPLACE_SUBTRACT: lhs_val -= rhs_val; break;

case MP_BINARY_OP_MULTIPLY:

case MP_BINARY_OP_INPLACE_MULTIPLY: lhs_val *= rhs_val; break;

case MP_BINARY_OP_FLOOR_DIVIDE:

case MP_BINARY_OP_INPLACE_FLOOR_DIVIDE:

if (rhs_val == 0) {

zero_division_error:

mp_raise_msg(&mp_type_ZeroDivisionError, "division by zero");

}

// Python specs require that x == (x//y)*y + (x%y) so we must

// call divmod to compute the correct floor division, which

// returns the floor divide in lhs_val.

mp_obj_float_divmod(&lhs_val, &rhs_val);

break;

case MP_BINARY_OP_TRUE_DIVIDE:

case MP_BINARY_OP_INPLACE_TRUE_DIVIDE:

if (rhs_val == 0) {

goto zero_division_error;

}

lhs_val /= rhs_val;

break;

case MP_BINARY_OP_MODULO:

case MP_BINARY_OP_INPLACE_MODULO:

if (rhs_val == 0) {

goto zero_division_error;

}

lhs_val = MICROPY_FLOAT_C_FUN(fmod)(lhs_val, rhs_val);

// Python specs require that mod has same sign as second operand

if (lhs_val == 0.0) {

lhs_val = MICROPY_FLOAT_C_FUN(copysign)(0.0, rhs_val);

} else {

if ((lhs_val < 0.0) != (rhs_val < 0.0)) {

lhs_val += rhs_val;

}

break;

case MP_BINARY_OP_POWER:

case MP_BINARY_OP_INPLACE_POWER:

if (lhs_val == 0 && rhs_val < 0) {

goto zero_division_error;

}

lhs_val = MICROPY_FLOAT_C_FUN(pow)(lhs_val, rhs_val);

break;

case MP_BINARY_OP_DIVMOD: {

if (rhs_val == 0) {

goto zero_division_error;

}

mp_obj_float_divmod(&lhs_val, &rhs_val);

mp_obj_t tuple[2] = {

mp_obj_new_float(lhs_val),

mp_obj_new_float(rhs_val),

};

return mp_obj_new_tuple(2, tuple);

}

case MP_BINARY_OP_LESS: return mp_obj_new_bool(lhs_val < rhs_val);

case MP_BINARY_OP_MORE: return mp_obj_new_bool(lhs_val > rhs_val);

case MP_BINARY_OP_EQUAL: return mp_obj_new_bool(lhs_val == rhs_val);

case MP_BINARY_OP_LESS_EQUAL: return mp_obj_new_bool(lhs_val <= rhs_val);

case MP_BINARY_OP_MORE_EQUAL: return mp_obj_new_bool(lhs_val >= rhs_val);

default:

return MP_OBJ_NULL; // op not supported

}

return mp_obj_new_float(lhs_val);

}

#pragma GCC diagnostic pop

#endif // MICROPY_PY_BUILTINS_FLOAT

circuitpython/py/objfloat.c at pdm · ProGamerCode/circuitpython · GitHub

Expand file tree

Breadcrumbs

objfloat.c

Latest commit

History

Breadcrumbs

objfloat.c

File metadata and controls