1  /* libgcc routines for R8C/M16C/M32C
       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  typedef          int  sint32_type   __attribute__ ((mode (SI)));
      27  typedef unsigned int  uint32_type   __attribute__ ((mode (SI)));
      28  typedef int           word_type     __attribute__ ((mode (__word__)));
      29  
      30  uint32_type udivmodsi4 (uint32_type, uint32_type, word_type);
      31  sint32_type __divsi3   (sint32_type, sint32_type);
      32  sint32_type __modsi3   (sint32_type, sint32_type);
      33  
      34  uint32_type
      35  udivmodsi4 (uint32_type num, uint32_type den, word_type modwanted)
      36  {
      37    uint32_type bit = 1;
      38    uint32_type res = 0;
      39  
      40    while (den < num && bit && !(den & (1L << 31)))
      41      {
      42        den <<= 1;
      43        bit <<= 1;
      44      }
      45    while (bit)
      46      {
      47        if (num >= den)
      48  	{
      49  	  num -= den;
      50  	  res |= bit;
      51  	}
      52        bit >>= 1;
      53        den >>= 1;
      54      }
      55    if (modwanted)
      56      return num;
      57    return res;
      58  }
      59  
      60  sint32_type
      61  __divsi3 (sint32_type a, sint32_type b)
      62  {
      63    word_type neg = 0;
      64    sint32_type res;
      65  
      66    if (a < 0)
      67      {
      68        a = -a;
      69        neg = !neg;
      70      }
      71  
      72    if (b < 0)
      73      {
      74        b = -b;
      75        neg = !neg;
      76      }
      77  
      78    res = udivmodsi4 (a, b, 0);
      79  
      80    if (neg)
      81      res = -res;
      82  
      83    return res;
      84  }
      85  
      86  sint32_type
      87  __modsi3 (sint32_type a, sint32_type b)
      88  {
      89    word_type neg = 0;
      90    sint32_type res;
      91  
      92    if (a < 0)
      93      {
      94        a = -a;
      95        neg = 1;
      96      }
      97  
      98    if (b < 0)
      99      b = -b;
     100  
     101    res = udivmodsi4 (a, b, 1);
     102  
     103    if (neg)
     104      res = -res;
     105  
     106    return res;
     107  }
     108  
     109  /* See the comment by the definition of LIBGCC2_UNITS_PER_WORD in
     110     m32c.h for why we are creating extra versions of some of the
     111     functions defined in libgcc2.c.  */
     112  
     113  #define LIBGCC2_UNITS_PER_WORD 2
     114  
     115  #define L_clzsi2
     116  #define L_ctzsi2
     117  #define L_ffssi2
     118  #define L_paritysi2
     119  #define L_popcountsi2
     120  
     121  #include "libgcc2.c"
     122  
     123  uint32_type
     124  __udivsi3 (uint32_type a, uint32_type b)
     125  {
     126    return udivmodsi4 (a, b, 0);
     127  }
     128  
     129  uint32_type
     130  __umoddi3 (uint32_type a, uint32_type b)
     131  {
     132    return udivmodsi4 (a, b, 1);
     133  }
     134  
     135  /* Returns the number of leading redundant sign bits in X.
     136     I.e. the number of bits following the most significant bit which are
     137     identical to it.  There are no special cases for 0 or other values.  */
     138  
     139  int
     140  __clrsbhi2 (word_type x)
     141  {
     142    if (x < 0)
     143      x = ~x;
     144    if (x == 0)
     145      return 15;
     146    return __builtin_clz (x) - 1;
     147  }