1  /* libgcc routines for MSP430
       2     Copyright (C) 2005-2023 Free Software Foundation, Inc.
       3     Contributed by Red Hat.
       4  
       5     This file is part of GCC.
       6  
       7     GCC is free software; you can redistribute it and/or modify it
       8     under the terms of the GNU General Public License as published
       9     by the Free Software Foundation; either version 3, or (at your
      10     option) any later version.
      11  
      12     GCC is distributed in the hope that it will be useful, but WITHOUT
      13     ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
      14     or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
      15     License for more details.
      16  
      17     Under Section 7 of GPL version 3, you are granted additional
      18     permissions described in the GCC Runtime Library Exception, version
      19     3.1, as published by the Free Software Foundation.
      20  
      21     You should have received a copy of the GNU General Public License and
      22     a copy of the GCC Runtime Library Exception along with this program;
      23     see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      24     <http://www.gnu.org/licenses/>.  */
      25  
      26  UINT_TYPE C3(udivmod,NAME_MODE,4) (UINT_TYPE, UINT_TYPE, word_type);
      27  SINT_TYPE C3(__div,NAME_MODE,3)   (SINT_TYPE, SINT_TYPE);
      28  SINT_TYPE C3(__mod,NAME_MODE,3)   (SINT_TYPE, SINT_TYPE);
      29  UINT_TYPE C3(__udiv,NAME_MODE,3)  (UINT_TYPE, UINT_TYPE);
      30  UINT_TYPE C3(__umod,NAME_MODE,3)  (UINT_TYPE, UINT_TYPE);
      31  
      32  UINT_TYPE
      33  C3(udivmod,NAME_MODE,4) (UINT_TYPE num, UINT_TYPE den, word_type modwanted)
      34  {
      35    UINT_TYPE bit = 1;
      36    UINT_TYPE res = 0;
      37  
      38    while (den < num && bit && !(den & (1L << BITS_MINUS_1)))
      39      {
      40        den <<= 1;
      41        bit <<= 1;
      42      }
      43    while (bit)
      44      {
      45        if (num >= den)
      46  	{
      47  	  num -= den;
      48  	  res |= bit;
      49  	}
      50        bit >>= 1;
      51        den >>= 1;
      52      }
      53    if (modwanted)
      54      return num;
      55    return res;
      56  }
      57  
      58  SINT_TYPE
      59  C3(__div,NAME_MODE,3) (SINT_TYPE a, SINT_TYPE b)
      60  {
      61    word_type neg = 0;
      62    SINT_TYPE res;
      63  
      64    if (a < 0)
      65      {
      66        a = -a;
      67        neg = !neg;
      68      }
      69  
      70    if (b < 0)
      71      {
      72        b = -b;
      73        neg = !neg;
      74      }
      75  
      76    res = C3(udivmod,NAME_MODE,4) (a, b, 0);
      77  
      78    if (neg)
      79      res = -res;
      80  
      81    return res;
      82  }
      83  
      84  SINT_TYPE
      85  C3(__mod,NAME_MODE,3) (SINT_TYPE a, SINT_TYPE b)
      86  {
      87    word_type neg = 0;
      88    SINT_TYPE res;
      89  
      90    if (a < 0)
      91      {
      92        a = -a;
      93        neg = 1;
      94      }
      95  
      96    if (b < 0)
      97      b = -b;
      98  
      99    res = C3(udivmod,NAME_MODE,4) (a, b, 1);
     100  
     101    if (neg)
     102      res = -res;
     103  
     104    return res;
     105  }
     106  
     107  UINT_TYPE
     108  C3(__udiv,NAME_MODE,3) (UINT_TYPE a, UINT_TYPE b)
     109  {
     110    return C3(udivmod,NAME_MODE,4) (a, b, 0);
     111  }
     112  
     113  UINT_TYPE
     114  C3(__umod,NAME_MODE,3) (UINT_TYPE a, UINT_TYPE b)
     115  {
     116    return C3(udivmod,NAME_MODE,4) (a, b, 1);
     117  }