1//===- unittests/Support/SwapByteOrderTest.cpp - swap byte order test -----===//
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#include "gtest/gtest.h"
11#include "llvm/Support/SwapByteOrder.h"
12#include <cstdlib>
13#include <ctime>
14using namespace llvm;
15
16#undef max
17
18namespace {
19
20// In these first two tests all of the origional_uintx values are truncated
21// except for 64. We could avoid this, but there's really no point.
22
23TEST(SwapByteOrder, UnsignedRoundTrip) {
24  // The point of the bit twiddling of magic is to test with and without bits
25  // in every byte.
26  uint64_t value = 1;
27  for (std::size_t i = 0; i <= sizeof(value); ++i) {
28    uint8_t origional_uint8 = static_cast<uint8_t>(value);
29    EXPECT_EQ(origional_uint8,
30      sys::SwapByteOrder(sys::SwapByteOrder(origional_uint8)));
31
32    uint16_t origional_uint16 = static_cast<uint16_t>(value);
33    EXPECT_EQ(origional_uint16,
34      sys::SwapByteOrder(sys::SwapByteOrder(origional_uint16)));
35
36    uint32_t origional_uint32 = static_cast<uint32_t>(value);
37    EXPECT_EQ(origional_uint32,
38      sys::SwapByteOrder(sys::SwapByteOrder(origional_uint32)));
39
40    uint64_t origional_uint64 = static_cast<uint64_t>(value);
41    EXPECT_EQ(origional_uint64,
42      sys::SwapByteOrder(sys::SwapByteOrder(origional_uint64)));
43
44    value = (value << 8) | 0x55; // binary 0101 0101.
45  }
46}
47
48TEST(SwapByteOrder, SignedRoundTrip) {
49  // The point of the bit twiddling of magic is to test with and without bits
50  // in every byte.
51  uint64_t value = 1;
52  for (std::size_t i = 0; i <= sizeof(value); ++i) {
53    int8_t origional_int8 = static_cast<int8_t>(value);
54    EXPECT_EQ(origional_int8,
55      sys::SwapByteOrder(sys::SwapByteOrder(origional_int8)));
56
57    int16_t origional_int16 = static_cast<int16_t>(value);
58    EXPECT_EQ(origional_int16,
59      sys::SwapByteOrder(sys::SwapByteOrder(origional_int16)));
60
61    int32_t origional_int32 = static_cast<int32_t>(value);
62    EXPECT_EQ(origional_int32,
63      sys::SwapByteOrder(sys::SwapByteOrder(origional_int32)));
64
65    int64_t origional_int64 = static_cast<int64_t>(value);
66    EXPECT_EQ(origional_int64,
67      sys::SwapByteOrder(sys::SwapByteOrder(origional_int64)));
68
69    // Test other sign.
70    value *= -1;
71
72    origional_int8 = static_cast<int8_t>(value);
73    EXPECT_EQ(origional_int8,
74      sys::SwapByteOrder(sys::SwapByteOrder(origional_int8)));
75
76    origional_int16 = static_cast<int16_t>(value);
77    EXPECT_EQ(origional_int16,
78      sys::SwapByteOrder(sys::SwapByteOrder(origional_int16)));
79
80    origional_int32 = static_cast<int32_t>(value);
81    EXPECT_EQ(origional_int32,
82      sys::SwapByteOrder(sys::SwapByteOrder(origional_int32)));
83
84    origional_int64 = static_cast<int64_t>(value);
85    EXPECT_EQ(origional_int64,
86      sys::SwapByteOrder(sys::SwapByteOrder(origional_int64)));
87
88    // Return to normal sign and twiddle.
89    value *= -1;
90    value = (value << 8) | 0x55; // binary 0101 0101.
91  }
92}
93
94TEST(SwapByteOrder, uint8_t) {
95  EXPECT_EQ(uint8_t(0x11), sys::SwapByteOrder(uint8_t(0x11)));
96}
97
98TEST(SwapByteOrder, uint16_t) {
99  EXPECT_EQ(uint16_t(0x1122), sys::SwapByteOrder(uint16_t(0x2211)));
100}
101
102TEST(SwapByteOrder, uint32_t) {
103  EXPECT_EQ(uint32_t(0x11223344), sys::SwapByteOrder(uint32_t(0x44332211)));
104}
105
106TEST(SwapByteOrder, uint64_t) {
107  EXPECT_EQ(uint64_t(0x1122334455667788ULL),
108    sys::SwapByteOrder(uint64_t(0x8877665544332211ULL)));
109}
110
111TEST(SwapByteOrder, int8_t) {
112  EXPECT_EQ(int8_t(0x11), sys::SwapByteOrder(int8_t(0x11)));
113}
114
115TEST(SwapByteOrder, int16_t) {
116  EXPECT_EQ(int16_t(0x1122), sys::SwapByteOrder(int16_t(0x2211)));
117}
118
119TEST(SwapByteOrder, int32_t) {
120  EXPECT_EQ(int32_t(0x11223344), sys::SwapByteOrder(int32_t(0x44332211)));
121}
122
123TEST(SwapByteOrder, int64_t) {
124  EXPECT_EQ(int64_t(0x1122334455667788LL),
125    sys::SwapByteOrder(int64_t(0x8877665544332211LL)));
126}
127
128}
129