1  /* Copyright (C) 2012-2023 Free Software Foundation, Inc.
       2     Contributed by Altera and Mentor Graphics, Inc.
       3  
       4  This file is free software; you can redistribute it and/or modify it
       5  under the terms of the GNU General Public License as published by the
       6  Free Software Foundation; either version 3, or (at your option) any
       7  later version.
       8  
       9  This file is distributed in the hope that it will be useful, but
      10  WITHOUT ANY WARRANTY; without even the implied warranty of
      11  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      12  General Public License for more details.
      13  
      14  Under Section 7 of GPL version 3, you are granted additional
      15  permissions described in the GCC Runtime Library Exception, version
      16  3.1, as published by the Free Software Foundation.
      17  
      18  You should have received a copy of the GNU General Public License and
      19  a copy of the GCC Runtime Library Exception along with this program;
      20  see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      21  <http://www.gnu.org/licenses/>.  */
      22  
      23  #include "lib2-gcn.h"
      24  
      25  /* 16-bit HI divide and modulo as used in gcn.  */
      26  
      27  static UHItype
      28  udivmodhi4 (UHItype num, UHItype den, word_type modwanted)
      29  {
      30    UHItype bit = 1;
      31    UHItype res = 0;
      32  
      33    while (den < num && bit && !(den & (1L<<15)))
      34      {
      35        den <<=1;
      36        bit <<=1;
      37      }
      38    while (bit)
      39      {
      40        if (num >= den)
      41  	{
      42  	  num -= den;
      43  	  res |= bit;
      44  	}
      45        bit >>=1;
      46        den >>=1;
      47      }
      48    if (modwanted)
      49      return num;
      50    return res;
      51  }
      52  
      53  
      54  HItype
      55  __divhi3 (HItype a, HItype b)
      56  {
      57    word_type neg = 0;
      58    HItype res;
      59  
      60    if (a < 0)
      61      {
      62        a = -a;
      63        neg = !neg;
      64      }
      65  
      66    if (b < 0)
      67      {
      68        b = -b;
      69        neg = !neg;
      70      }
      71  
      72    res = udivmodhi4 (a, b, 0);
      73  
      74    if (neg)
      75      res = -res;
      76  
      77    return res;
      78  }
      79  
      80  
      81  HItype
      82  __modhi3 (HItype a, HItype b)
      83  {
      84    word_type neg = 0;
      85    HItype res;
      86  
      87    if (a < 0)
      88      {
      89        a = -a;
      90        neg = 1;
      91      }
      92  
      93    if (b < 0)
      94      b = -b;
      95  
      96    res = udivmodhi4 (a, b, 1);
      97  
      98    if (neg)
      99      res = -res;
     100  
     101    return res;
     102  }
     103  
     104  
     105  UHItype
     106  __udivhi3 (UHItype a, UHItype b)
     107  {
     108    return udivmodhi4 (a, b, 0);
     109  }
     110  
     111  
     112  UHItype
     113  __umodhi3 (UHItype a, UHItype b)
     114  {
     115    return udivmodhi4 (a, b, 1);
     116  }
     117