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1 //===-- popcountsi2_test.c - Test __popcountsi2 ---------------------------===//
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 __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 
20 COMPILER_RT_ABI si_int __popcountsi2(si_int a);
21 
naive_popcount(si_int a)22 int 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 
test__popcountsi2(si_int a)30 int 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 
40 char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0};
41 
main()42 int 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