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>
14 using namespace llvm;
15
16 #undef max
17
18 namespace {
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
TEST(SwapByteOrder,UnsignedRoundTrip)23 TEST(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
TEST(SwapByteOrder,SignedRoundTrip)48 TEST(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
TEST(SwapByteOrder,uint8_t)94 TEST(SwapByteOrder, uint8_t) {
95 EXPECT_EQ(uint8_t(0x11), sys::SwapByteOrder(uint8_t(0x11)));
96 }
97
TEST(SwapByteOrder,uint16_t)98 TEST(SwapByteOrder, uint16_t) {
99 EXPECT_EQ(uint16_t(0x1122), sys::SwapByteOrder(uint16_t(0x2211)));
100 }
101
TEST(SwapByteOrder,uint32_t)102 TEST(SwapByteOrder, uint32_t) {
103 EXPECT_EQ(uint32_t(0x11223344), sys::SwapByteOrder(uint32_t(0x44332211)));
104 }
105
TEST(SwapByteOrder,uint64_t)106 TEST(SwapByteOrder, uint64_t) {
107 EXPECT_EQ(uint64_t(0x1122334455667788ULL),
108 sys::SwapByteOrder(uint64_t(0x8877665544332211ULL)));
109 }
110
TEST(SwapByteOrder,int8_t)111 TEST(SwapByteOrder, int8_t) {
112 EXPECT_EQ(int8_t(0x11), sys::SwapByteOrder(int8_t(0x11)));
113 }
114
TEST(SwapByteOrder,int16_t)115 TEST(SwapByteOrder, int16_t) {
116 EXPECT_EQ(int16_t(0x1122), sys::SwapByteOrder(int16_t(0x2211)));
117 }
118
TEST(SwapByteOrder,int32_t)119 TEST(SwapByteOrder, int32_t) {
120 EXPECT_EQ(int32_t(0x11223344), sys::SwapByteOrder(int32_t(0x44332211)));
121 }
122
TEST(SwapByteOrder,int64_t)123 TEST(SwapByteOrder, int64_t) {
124 EXPECT_EQ(int64_t(0x1122334455667788LL),
125 sys::SwapByteOrder(int64_t(0x8877665544332211LL)));
126 }
127
128 }
129