OpenCores
URL https://opencores.org/ocsvn/openrisc_me/openrisc_me/trunk

Subversion Repositories openrisc_me

[/] [openrisc/] [trunk/] [gnu-src/] [newlib-1.18.0/] [newlib/] [libc/] [machine/] [w65/] [divsi3.c] - Blame information for rev 207

Details | Compare with Previous | View Log

Line No. Rev Author Line
1 207 jeremybenn 
 
2 
#define divnorm(num, den, sign)                 \
3 
{                                               \
4 
  if (num < 0)                                   \
5 
    {                                           \
6 
      num = -num;                               \
7 
      sign = 1;                                 \
8 
    }                                           \
9 
  else                                          \
10 
    {                                           \
11 
      sign = 0;                                  \
12 
    }                                           \
13 
                                                \
14 
  if (den < 0)                                   \
15 
    {                                           \
16 
      den = - den;                              \
17 
      sign = 1 - sign;                          \
18 
    }                                           \
19 
}
20 
 
21 
 
22 
 
23 
 
24 
 
25 
static unsigned long
26 
divmodsi4(int modwanted, unsigned long num, unsigned long den)
27 
{
28 
  long int bit = 1;
29 
  long int res = 0;
30 
  long prevden;
31 
  while (den < num && bit && !(den & (1L<<31)))
32 
    {
33 
      den <<=1;
34 
      bit <<=1;
35 
    }
36 
  while (bit)
37 
    {
38 
      if (num >= den)
39 
        {
40 
          num -= den;
41 
          res |= bit;
42 
        }
43 
      bit >>=1;
44 
      den >>=1;
45 
    }
46 
  if (modwanted) return num;
47 
  return res;
48 
}
49 
 
50 
 
51 
#define exitdiv(sign, res) if (sign) { res = - res;} return res;
52 
 
53 
long
54 
__modsi3 (long numerator, long denominator)
55 
{
56 
  int sign = 0;
57 
  long dividend;
58 
  long modul;
59 
 
60 
 
61 
  if (numerator < 0)
62 
    {
63 
      numerator = -numerator;
64 
      sign = 1;
65 
    }
66 
  if (denominator < 0)
67 
    {
68 
      denominator = -denominator;
69 
    }
70 
 
71 
  modul =  divmodsi4 (1, numerator, denominator);
72 
  if (sign)
73 
    return - modul;
74 
  return modul;
75 
}
76 
 
77 
 
78 
long
79 
__divsi3 (long numerator, long denominator)
80 
{
81 
  int sign;
82 
  long dividend;
83 
  long modul;
84 
  divnorm (numerator, denominator, sign);
85 
 
86 
  dividend = divmodsi4 (0,  numerator, denominator);
87 
  exitdiv (sign, dividend);
88 
}
89 
 
90 
long
91 
__umodsi3 (unsigned long numerator, unsigned long denominator)
92 
{
93 
  long dividend;
94 
  long modul;
95 
 
96 
modul= divmodsi4 (1,  numerator, denominator);
97 
  return modul;
98 
}
99 
 
100 
long
101 
__udivsi3 (unsigned long numerator, unsigned long denominator)
102 
{
103 
  int sign;
104 
  long dividend;
105 
  long modul;
106 
  dividend =   divmodsi4 (0, numerator, denominator);
107 
  return dividend;
108 
}
109 
 
110 
 
111 
 
112 
 
113 
 
114 
 
115 
#ifdef TEST
116 
 
117 
 
118 
 
119 
main ()
120 
{
121 
  long int i, j, k, m;
122 
  for (i = -10000; i < 10000; i += 8)
123 
    {
124 
      for (j = -10000; j < 10000; j += 11)
125 
        {
126 
          k = i / j;
127 
          m = __divsi3 (i, j);
128 
          if (k != m)
129 
            printf ("fail %d %d %d %d\n", i, j, k, m);
130 
        }
131 
    }
132 
}
133 
 
134 
#endif

powered by: WebSVN 2.1.0

© copyright 1999-2024 OpenCores.org, equivalent to Oliscience, all rights reserved. OpenCores®, registered trademark.