1 // RUN: %clang_builtins %s %librt -o %t && %run %t
2 // REQUIRES: librt_has_paritysi2
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 __paritysi2(si_int a);
11 
naive_parity(si_int a)12 int naive_parity(si_int a)
13 {
14     int r = 0;
15     for (; a; a = a & (a - 1))
16         r = ~r;
17     return r & 1;
18 }
19 
test__paritysi2(si_int a)20 int test__paritysi2(si_int a)
21 {
22     si_int x = __paritysi2(a);
23     si_int expected = naive_parity(a);
24     if (x != expected)
25         printf("error in __paritysi2(0x%X) = %d, expected %d\n",
26                a, x, expected);
27     return x != expected;
28 }
29 
30 char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0};
31 
main()32 int main()
33 {
34     int i;
35     for (i = 0; i < 10000; ++i)
36         if (test__paritysi2(rand()))
37             return 1;
38 
39    return 0;
40 }
41