1 //===-- paritydi2_test.c - Test __paritydi2 -------------------------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is dual licensed under the MIT and the University of Illinois Open
6 // Source Licenses. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 //
10 // This file tests __paritydi2 for the compiler_rt library.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "int_lib.h"
15 #include <stdio.h>
16 #include <stdlib.h>
17 
18 // Returns: 1 if number of bits is odd else returns 0
19 
20 si_int __paritydi2(di_int a);
21 
naive_parity(di_int a)22 int naive_parity(di_int a)
23 {
24     int r = 0;
25     for (; a; a = a & (a - 1))
26         r = ~r;
27     return r & 1;
28 }
29 
test__paritydi2(di_int a)30 int test__paritydi2(di_int a)
31 {
32     si_int x = __paritydi2(a);
33     si_int expected = naive_parity(a);
34     if (x != expected)
35         printf("error in __paritydi2(0x%llX) = %d, expected %d\n",
36                a, x, expected);
37     return x != expected;
38 }
39 
40 char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
41 char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0};
42 
main()43 int main()
44 {
45     int i;
46     for (i = 0; i < 10000; ++i)
47         if (test__paritydi2(((di_int)rand() << 32) + rand()))
48             return 1;
49 
50    return 0;
51 }
52