libgcc/config/m32c/lib2funcs.c

   1 /* libgcc routines for R8C/M16C/M32C
   2    Copyright (C) 2005-2013 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 }