1 //===-- popcountdi2_test.c - Test __popcountdi2 ----------------------------===//
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 __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 
20 si_int __popcountdi2(di_int a);
21 
naive_popcount(di_int a)22 int 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 
test__popcountdi2(di_int a)30 int 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 
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     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