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1 //===-- paritysi2_test.c - Test __paritysi2 -------------------------------===//
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 __paritysi2 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 COMPILER_RT_ABI si_int __paritysi2(si_int a);
21 
naive_parity(si_int a)22 int naive_parity(si_int a)
23 {
24     int r = 0;
25     for (; a; a = a & (a - 1))
26         r = ~r;
27     return r & 1;
28 }
29 
test__paritysi2(si_int a)30 int test__paritysi2(si_int a)
31 {
32     si_int x = __paritysi2(a);
33     si_int expected = naive_parity(a);
34     if (x != expected)
35         printf("error in __paritysi2(0x%X) = %d, expected %d\n",
36                a, x, expected);
37     return x != expected;
38 }
39 
40 char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0};
41 
main()42 int main()
43 {
44     int i;
45     for (i = 0; i < 10000; ++i)
46         if (test__paritysi2(rand()))
47             return 1;
48 
49    return 0;
50 }
51