1 // RUN: %clang_builtins %s %librt -o %t && %run %t
2 // REQUIRES: librt_has_popcountdi2
3 
4 #include "int_lib.h"
5 #include <stdio.h>
6 #include <stdlib.h>
7 
8 // Returns: count of 1 bits
9 
10 COMPILER_RT_ABI int __popcountdi2(di_int a);
11 
naive_popcount(di_int a)12 int naive_popcount(di_int a)
13 {
14     int r = 0;
15     for (; a; a = (du_int)a >> 1)
16         r += a & 1;
17     return r;
18 }
19 
test__popcountdi2(di_int a)20 int test__popcountdi2(di_int a)
21 {
22     int x = __popcountdi2(a);
23     int expected = naive_popcount(a);
24     if (x != expected)
25         printf("error in __popcountdi2(0x%llX) = %d, expected %d\n",
26                a, x, expected);
27     return x != expected;
28 }
29 
30 char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
31 char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0};
32 
main()33 int main()
34 {
35     if (test__popcountdi2(0))
36         return 1;
37     if (test__popcountdi2(1))
38         return 1;
39     if (test__popcountdi2(2))
40         return 1;
41     if (test__popcountdi2(0xFFFFFFFFFFFFFFFDLL))
42         return 1;
43     if (test__popcountdi2(0xFFFFFFFFFFFFFFFELL))
44         return 1;
45     if (test__popcountdi2(0xFFFFFFFFFFFFFFFFLL))
46         return 1;
47     int i;
48     for (i = 0; i < 10000; ++i)
49         if (test__popcountdi2(((di_int)rand() << 32) | rand()))
50             return 1;
51 
52    return 0;
53 }
54