|
111
|
1 /* Contributed by Jack Lloyd <lloyd@randombit.net> */
|
|
|
2
|
|
|
3 /* { dg-options "-O2 -ftree-vectorize" } */
|
|
|
4 /* { dg-options "-O2 -ftree-vectorize -march=nocona" { target { i?86-*-* x86_64-*-* } } } */
|
|
|
5
|
|
|
6 typedef unsigned long long word;
|
|
|
7
|
|
|
8 const unsigned int MP_WORD_BITS = 64;
|
|
|
9 const word MP_WORD_MASK = ~((word)0);
|
|
|
10 const word MP_WORD_TOP_BIT = (word)1 << (8*sizeof(word) - 1);
|
|
|
11
|
|
|
12 extern void abort (void);
|
|
|
13
|
|
|
14 word do_div(word n1, word n0, word d)
|
|
|
15 {
|
|
|
16 word high = n1 % d, quotient = 0;
|
|
|
17 unsigned int j;
|
|
|
18
|
|
|
19 for(j = 0; j != MP_WORD_BITS; ++j)
|
|
|
20 {
|
|
|
21 word high_top_bit = (high & MP_WORD_TOP_BIT);
|
|
|
22
|
|
|
23 high <<= 1;
|
|
|
24 high |= (n0 >> (MP_WORD_BITS-1-j)) & 1;
|
|
|
25 quotient <<= 1;
|
|
|
26
|
|
|
27 if(high_top_bit || high >= d)
|
|
|
28 {
|
|
|
29 high -= d;
|
|
|
30 quotient |= 1;
|
|
|
31 }
|
|
|
32 }
|
|
|
33
|
|
|
34 return quotient;
|
|
|
35 }
|
|
|
36
|
|
|
37 int main()
|
|
|
38 {
|
|
|
39 word result;
|
|
|
40
|
|
|
41 result = do_div(0x0000000000200000ll,
|
|
|
42 0x0000000000000000ll,
|
|
|
43 0x86E53497CE000000ll);
|
|
|
44
|
|
|
45
|
|
|
46 if (result != 0x3CBA83)
|
|
|
47 abort ();
|
|
|
48
|
|
|
49 return 0;
|
|
|
50 }
|
