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
|
/**
* Copyright (C) 2021-present MongoDB, Inc.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the Server Side Public License, version 1,
* as published by MongoDB, Inc.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* Server Side Public License for more details.
*
* You should have received a copy of the Server Side Public License
* along with this program. If not, see
* <http://www.mongodb.com/licensing/server-side-public-license>.
*
* As a special exception, the copyright holders give permission to link the
* code of portions of this program with the OpenSSL library under certain
* conditions as described in each individual source file and distribute
* linked combinations including the program with the OpenSSL library. You
* must comply with the Server Side Public License in all respects for
* all of the code used other than as permitted herein. If you modify file(s)
* with this exception, you may extend this exception to your version of the
* file(s), but you are not obligated to do so. If you do not wish to do so,
* delete this exception statement from your version. If you delete this
* exception statement from all source files in the program, then also delete
* it in the license file.
*/
#include "mongo/platform/int128.h"
#include "mongo/unittest/unittest.h"
using namespace mongo;
// Asserts that we can cast to uint128_t and cast back as well that the expected high and low bits
// after cast are following 2's complement.
void assertCastIsValid(int128_t val, uint64_t expectedHi, uint64_t expectedLo) {
uint128_t castedInt = static_cast<uint128_t>(val);
ASSERT_EQUALS(absl::Uint128High64(castedInt), expectedHi);
ASSERT_EQUALS(absl::Uint128Low64(castedInt), expectedLo);
int128_t backToSigned = static_cast<int128_t>(castedInt);
ASSERT_EQUALS(val, backToSigned);
}
TEST(Int128, TestCastingPositive) {
assertCastIsValid(12345, 0, 12345);
}
TEST(Int128, TestCastingNegative) {
assertCastIsValid(-12345, 0xFFFFFFFFFFFFFFFF, 0xFFFFFFFFFFFFCFC7);
}
TEST(Int128, MaxPositiveInt) {
assertCastIsValid(std::numeric_limits<int128_t>::max(), 0x7FFFFFFFFFFFFFFF, 0xFFFFFFFFFFFFFFFF);
}
TEST(Int128, MaxNegativeInt) {
assertCastIsValid(std::numeric_limits<int128_t>::min(), 0x8000000000000000, 0);
}
|
