popcountdi2_test.c
1.7 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
// RUN: %clang_builtins %s %librt -o %t && %run %t
// REQUIRES: librt_has_popcountdi2
//===-- popcountdi2_test.c - Test __popcountdi2 ----------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file tests __popcountdi2 for the compiler_rt library.
//
//===----------------------------------------------------------------------===//
#include "int_lib.h"
#include <stdio.h>
#include <stdlib.h>
// Returns: count of 1 bits
COMPILER_RT_ABI si_int __popcountdi2(di_int a);
int naive_popcount(di_int a)
{
int r = 0;
for (; a; a = (du_int)a >> 1)
r += a & 1;
return r;
}
int test__popcountdi2(di_int a)
{
si_int x = __popcountdi2(a);
si_int expected = naive_popcount(a);
if (x != expected)
printf("error in __popcountdi2(0x%llX) = %d, expected %d\n",
a, x, expected);
return x != expected;
}
char assumption_1[sizeof(di_int) == 2*sizeof(si_int)] = {0};
char assumption_2[sizeof(si_int)*CHAR_BIT == 32] = {0};
int main()
{
if (test__popcountdi2(0))
return 1;
if (test__popcountdi2(1))
return 1;
if (test__popcountdi2(2))
return 1;
if (test__popcountdi2(0xFFFFFFFFFFFFFFFDLL))
return 1;
if (test__popcountdi2(0xFFFFFFFFFFFFFFFELL))
return 1;
if (test__popcountdi2(0xFFFFFFFFFFFFFFFFLL))
return 1;
int i;
for (i = 0; i < 10000; ++i)
if (test__popcountdi2(((di_int)rand() << 32) | rand()))
return 1;
return 0;
}