gcc/config/m32c/m32c-lib2.c

   1 /* libgcc routines for R8C/M16C/M32C
   2    Copyright (C) 2005, 2009
   3    Free Software Foundation, Inc.
   4    Contributed by Red Hat.
   5
   6    This file is part of GCC.
   7
   8    GCC is free software; you can redistribute it and/or modify it
   9    under the terms of the GNU General Public License as published
  10    by the Free Software Foundation; either version 3, or (at your
  11    option) any later version.
  12
  13    GCC is distributed in the hope that it will be useful, but WITHOUT
  14    ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  15    or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
  16    License for more details.
  17
  18    Under Section 7 of GPL version 3, you are granted additional
  19    permissions described in the GCC Runtime Library Exception, version
  20    3.1, as published by the Free Software Foundation.
  21
  22    You should have received a copy of the GNU General Public License and
  23    a copy of the GCC Runtime Library Exception along with this program;
  24    see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
  25    <http://www.gnu.org/licenses/>.  */
  26
  27 typedef          int  sint32_type   __attribute__ ((mode (SI)));
  28 typedef unsigned int  uint32_type   __attribute__ ((mode (SI)));
  29 typedef int           word_type     __attribute__ ((mode (__word__)));
  30
  31 uint32_type udivmodsi4 (uint32_type, uint32_type, word_type);
  32 sint32_type __divsi3   (sint32_type, sint32_type);
  33 sint32_type __modsi3   (sint32_type, sint32_type);
  34
  35 uint32_type
  36 udivmodsi4 (uint32_type num, uint32_type den, word_type modwanted)
  37 {
  38   uint32_type bit = 1;
  39   uint32_type res = 0;
  40
  41   while (den < num && bit && !(den & (1L << 31)))
  42     {
  43       den <<= 1;
  44       bit <<= 1;
  45     }
  46   while (bit)
  47     {
  48       if (num >= den)
  49         {
  50           num -= den;
  51           res |= bit;
  52         }
  53       bit >>= 1;
  54       den >>= 1;
  55     }
  56   if (modwanted)
  57     return num;
  58   return res;
  59 }
  60
  61 sint32_type
  62 __divsi3 (sint32_type a, sint32_type b)
  63 {
  64   word_type neg = 0;
  65   sint32_type res;
  66
  67   if (a < 0)
  68     {
  69       a = -a;
  70       neg = !neg;
  71     }
  72
  73   if (b < 0)
  74     {
  75       b = -b;
  76       neg = !neg;
  77     }
  78
  79   res = udivmodsi4 (a, b, 0);
  80
  81   if (neg)
  82     res = -res;
  83
  84   return res;
  85 }
  86
  87 sint32_type
  88 __modsi3 (sint32_type a, sint32_type b)
  89 {
  90   word_type neg = 0;
  91   sint32_type res;
  92
  93   if (a < 0)
  94     {
  95       a = -a;
  96       neg = 1;
  97     }
  98
  99   if (b < 0)
 100     b = -b;
 101
 102   res = udivmodsi4 (a, b, 1);
 103
 104   if (neg)
 105     res = -res;
 106
 107   return res;
 108 }
 109
 110 /* See the comment by the definition of LIBGCC2_UNITS_PER_WORD in
 111    m32c.h for why we are creating extra versions of some of the
 112    functions defined in libgcc2.c.  */
 113
 114 #define LIBGCC2_UNITS_PER_WORD 2
 115
 116 #define L_clzsi2
 117 #define L_ctzsi2
 118 #define L_ffssi2
 119 #define L_paritysi2
 120 #define L_popcountsi2
 121
 122 #include "libgcc2.c"
 123
 124 uint32_type
 125 __udivsi3 (uint32_type a, uint32_type b)
 126 {
 127   return udivmodsi4 (a, b, 0);
 128 }
 129
 130 uint32_type
 131 __umoddi3 (uint32_type a, uint32_type b)
 132 {
 133   return udivmodsi4 (a, b, 1);
 134 }