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 
do_div(word n1,word n0,word d)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 
main()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 }
51