1//===-- popcountsi2_test.c - Test __popcountsi2 ---------------------------===//
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 __popcountsi2 for the compiler_rt library.
11//
12//===----------------------------------------------------------------------===//
13
14#include "int_lib.h"
15#include <stdio.h>
16#include <stdlib.h>
17
18// Returns: count of 1 bits
19
20si_int __popcountsi2(si_int a);
21
22int naive_popcount(si_int a)
23{
24    int r = 0;
25    for (; a; a = (su_int)a >> 1)
26        r += a & 1;
27    return r;
28}
29
30int test__popcountsi2(si_int a)
31{
32    si_int x = __popcountsi2(a);
33    si_int expected = naive_popcount(a);
34    if (x != expected)
35        printf("error in __popcountsi2(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    if (test__popcountsi2(0))
45        return 1;
46    if (test__popcountsi2(1))
47        return 1;
48    if (test__popcountsi2(2))
49        return 1;
50    if (test__popcountsi2(0xFFFFFFFD))
51        return 1;
52    if (test__popcountsi2(0xFFFFFFFE))
53        return 1;
54    if (test__popcountsi2(0xFFFFFFFF))
55        return 1;
56    int i;
57    for (i = 0; i < 10000; ++i)
58        if (test__popcountsi2(rand()))
59            return 1;
60
61   return 0;
62}
63