1 /* 2 * This file is part of the MicroPython project, http://micropython.org/ 3 * 4 * The MIT License (MIT) 5 * 6 * Copyright (c) 2013, 2014 Damien P. George 7 * 8 * Permission is hereby granted, free of charge, to any person obtaining a copy 9 * of this software and associated documentation files (the "Software"), to deal 10 * in the Software without restriction, including without limitation the rights 11 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell 12 * copies of the Software, and to permit persons to whom the Software is 13 * furnished to do so, subject to the following conditions: 14 * 15 * The above copyright notice and this permission notice shall be included in 16 * all copies or substantial portions of the Software. 17 * 18 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 19 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 20 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE 21 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 22 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, 23 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN 24 * THE SOFTWARE. 25 */ 26 #ifndef MICROPY_INCLUDED_PY_SMALLINT_H 27 #define MICROPY_INCLUDED_PY_SMALLINT_H 28 29 #include "py/mpconfig.h" 30 #include "py/misc.h" 31 32 // Functions for small integer arithmetic 33 34 #ifndef MP_SMALL_INT_MIN 35 36 // In SMALL_INT, next-to-highest bits is used as sign, so both must match for value in range 37 #if MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_A || MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_C 38 39 #define MP_SMALL_INT_MIN ((mp_int_t)(((mp_int_t)MP_OBJ_WORD_MSBIT_HIGH) >> 1)) 40 #define MP_SMALL_INT_FITS(n) ((((n) ^ ((mp_uint_t)(n) << 1)) & MP_OBJ_WORD_MSBIT_HIGH) == 0) 41 // Mask to truncate mp_int_t to positive value 42 #define MP_SMALL_INT_POSITIVE_MASK ~(MP_OBJ_WORD_MSBIT_HIGH | (MP_OBJ_WORD_MSBIT_HIGH >> 1)) 43 44 #elif MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_B 45 46 #define MP_SMALL_INT_MIN ((mp_int_t)(((mp_int_t)MP_OBJ_WORD_MSBIT_HIGH) >> 2)) 47 #define MP_SMALL_INT_FITS(n) ((((n) & MP_SMALL_INT_MIN) == 0) || (((n) & MP_SMALL_INT_MIN) == MP_SMALL_INT_MIN)) 48 // Mask to truncate mp_int_t to positive value 49 #define MP_SMALL_INT_POSITIVE_MASK ~(MP_OBJ_WORD_MSBIT_HIGH | (MP_OBJ_WORD_MSBIT_HIGH >> 1) | (MP_OBJ_WORD_MSBIT_HIGH >> 2)) 50 51 #elif MICROPY_OBJ_REPR == MICROPY_OBJ_REPR_D 52 53 #define MP_SMALL_INT_MIN ((mp_int_t)(((mp_int_t)0xffff800000000000) >> 1)) 54 #define MP_SMALL_INT_FITS(n) ((((n) ^ ((n) << 1)) & 0xffff800000000000) == 0) 55 // Mask to truncate mp_int_t to positive value 56 #define MP_SMALL_INT_POSITIVE_MASK ~(0xffff800000000000 | (0xffff800000000000 >> 1)) 57 58 #endif 59 60 #endif 61 62 #define MP_SMALL_INT_MAX ((mp_int_t)(~(MP_SMALL_INT_MIN))) 63 64 bool mp_small_int_mul_overflow(mp_int_t x, mp_int_t y); 65 mp_int_t mp_small_int_modulo(mp_int_t dividend, mp_int_t divisor); 66 mp_int_t mp_small_int_floor_divide(mp_int_t num, mp_int_t denom); 67 68 #endif // MICROPY_INCLUDED_PY_SMALLINT_H 69