1//===-- popcountdi2_test.c - Test __popcountdi2 ----------------------------===//
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 __popcountdi2 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 __popcountdi2(di_int a);
21
22int naive_popcount(di_int a)
23{
24    int r = 0;
25    for (; a; a = (du_int)a >> 1)
26        r += a & 1;
27    return r;
28}
29
30int test__popcountdi2(di_int a)
31{
32    si_int x = __popcountdi2(a);
33    si_int expected = naive_popcount(a);
34    if (x != expected)
35        printf("error in __popcountdi2(0x%llX) = %d, expected %d\n",
36               a, x, expected);
37    return x != expected;
38}
39
40char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
41char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0};
42
43int main()
44{
45    if (test__popcountdi2(0))
46        return 1;
47    if (test__popcountdi2(1))
48        return 1;
49    if (test__popcountdi2(2))
50        return 1;
51    if (test__popcountdi2(0xFFFFFFFFFFFFFFFDLL))
52        return 1;
53    if (test__popcountdi2(0xFFFFFFFFFFFFFFFELL))
54        return 1;
55    if (test__popcountdi2(0xFFFFFFFFFFFFFFFFLL))
56        return 1;
57    int i;
58    for (i = 0; i < 10000; ++i)
59        if (test__popcountdi2(((di_int)rand() << 32) | rand()))
60            return 1;
61
62   return 0;
63}
64