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       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                 :            : 
      27                 :            : #include "py/smallint.h"
      28                 :            : 
      29                 :    3415421 : bool mp_small_int_mul_overflow(mp_int_t x, mp_int_t y) {
      30                 :            :     // Check for multiply overflow; see CERT INT32-C
      31         [ +  + ]:    3415421 :     if (x > 0) { // x is positive
      32         [ +  + ]:    2623480 :         if (y > 0) { // x and y are positive
      33         [ +  + ]:    2621808 :             if (x > (MP_SMALL_INT_MAX / y)) {
      34                 :       1388 :                 return true;
      35                 :            :             }
      36                 :            :         } else { // x positive, y nonpositive
      37         [ +  + ]:       1672 :             if (y < (MP_SMALL_INT_MIN / x)) {
      38                 :          4 :                 return true;
      39                 :            :             }
      40                 :            :         } // x positive, y nonpositive
      41                 :            :     } else { // x is nonpositive
      42         [ +  + ]:     791941 :         if (y > 0) { // x is nonpositive, y is positive
      43         [ +  + ]:     791853 :             if (x < (MP_SMALL_INT_MIN / y)) {
      44                 :          4 :                 return true;
      45                 :            :             }
      46                 :            :         } else { // x and y are nonpositive
      47   [ +  +  +  + ]:         88 :             if (x != 0 && y < (MP_SMALL_INT_MAX / x)) {
      48                 :          4 :                 return true;
      49                 :            :             }
      50                 :            :         } // End if x and y are nonpositive
      51                 :            :     } // End if x is nonpositive
      52                 :            :     return false;
      53                 :            : }
      54                 :            : 
      55                 :      97654 : mp_int_t mp_small_int_modulo(mp_int_t dividend, mp_int_t divisor) {
      56                 :            :     // Python specs require that mod has same sign as second operand
      57                 :      97654 :     dividend %= divisor;
      58   [ +  +  +  + ]:      97654 :     if ((dividend < 0 && divisor > 0) || (dividend > 0 && divisor < 0)) {
      59                 :        112 :         dividend += divisor;
      60                 :            :     }
      61                 :      97654 :     return dividend;
      62                 :            : }
      63                 :            : 
      64                 :       5428 : mp_int_t mp_small_int_floor_divide(mp_int_t num, mp_int_t denom) {
      65         [ +  + ]:       5428 :     if (num >= 0) {
      66         [ +  + ]:       5228 :         if (denom < 0) {
      67                 :        132 :             num += -denom - 1;
      68                 :            :         }
      69                 :            :     } else {
      70         [ +  + ]:        200 :         if (denom >= 0) {
      71                 :        100 :             num += -denom + 1;
      72                 :            :         }
      73                 :            :     }
      74                 :       5428 :     return num / denom;
      75                 :            : }