paritysi2_test.c revision 77ed6142daed1e068fbda64405d0de9845e40e1a 
1//===-- paritysi2_test.c - Test __paritysi2 -------------------------------===//
2//
3//                     The LLVM Compiler Infrastructure
4//
5// This file is distributed under the University of Illinois Open Source
6// License. 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
20si_int __paritysi2(si_int a);
21
22int 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
30int 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
40char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0};
41
42int 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