1 // RUN: %clang_builtins %s %librt -o %t && %run %t
2 // REQUIRES: librt_has_paritydi2
3 
4 #include "int_lib.h"
5 #include <stdio.h>
6 #include <stdlib.h>
7 
8 // Returns: 1 if number of bits is odd else returns 0
9 
10 COMPILER_RT_ABI int __paritydi2(di_int a);
11 
naive_parity(di_int a)12 int naive_parity(di_int a)
13 {
14     int r = 0;
15     for (; a; a = a & (a - 1))
16         r = ~r;
17     return r & 1;
18 }
19 
test__paritydi2(di_int a)20 int test__paritydi2(di_int a)
21 {
22     si_int x = __paritydi2(a);
23     si_int expected = naive_parity(a);
24     if (x != expected)
25         printf("error in __paritydi2(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     int i;
36     for (i = 0; i < 10000; ++i)
37         if (test__paritydi2(((di_int)rand() << 32) + rand()))
38             return 1;
39 
40    return 0;
41 }
42