1 //===- unittests/Support/SwapByteOrderTest.cpp - swap byte order test -----===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "llvm/Support/SwapByteOrder.h"
11 #include "gtest/gtest.h"
20 // In these first two tests all of the original_uintx values are truncated
21 // except for 64. We could avoid this, but there's really no point.
23 TEST(getSwappedBytes, UnsignedRoundTrip) {
24 // The point of the bit twiddling of magic is to test with and without bits
27 for (std::size_t i = 0; i <= sizeof(value); ++i) {
28 uint8_t original_uint8 = static_cast<uint8_t>(value);
29 EXPECT_EQ(original_uint8,
30 sys::getSwappedBytes(sys::getSwappedBytes(original_uint8)));
32 uint16_t original_uint16 = static_cast<uint16_t>(value);
33 EXPECT_EQ(original_uint16,
34 sys::getSwappedBytes(sys::getSwappedBytes(original_uint16)));
36 uint32_t original_uint32 = static_cast<uint32_t>(value);
37 EXPECT_EQ(original_uint32,
38 sys::getSwappedBytes(sys::getSwappedBytes(original_uint32)));
40 uint64_t original_uint64 = static_cast<uint64_t>(value);
41 EXPECT_EQ(original_uint64,
42 sys::getSwappedBytes(sys::getSwappedBytes(original_uint64)));
44 value = (value << 8) | 0x55; // binary 0101 0101.
48 TEST(getSwappedBytes, SignedRoundTrip) {
49 // The point of the bit twiddling of magic is to test with and without bits
52 for (std::size_t i = 0; i <= sizeof(value); ++i) {
53 int8_t original_int8 = static_cast<int8_t>(value);
54 EXPECT_EQ(original_int8,
55 sys::getSwappedBytes(sys::getSwappedBytes(original_int8)));
57 int16_t original_int16 = static_cast<int16_t>(value);
58 EXPECT_EQ(original_int16,
59 sys::getSwappedBytes(sys::getSwappedBytes(original_int16)));
61 int32_t original_int32 = static_cast<int32_t>(value);
62 EXPECT_EQ(original_int32,
63 sys::getSwappedBytes(sys::getSwappedBytes(original_int32)));
65 int64_t original_int64 = static_cast<int64_t>(value);
66 EXPECT_EQ(original_int64,
67 sys::getSwappedBytes(sys::getSwappedBytes(original_int64)));
72 original_int8 = static_cast<int8_t>(value);
73 EXPECT_EQ(original_int8,
74 sys::getSwappedBytes(sys::getSwappedBytes(original_int8)));
76 original_int16 = static_cast<int16_t>(value);
77 EXPECT_EQ(original_int16,
78 sys::getSwappedBytes(sys::getSwappedBytes(original_int16)));
80 original_int32 = static_cast<int32_t>(value);
81 EXPECT_EQ(original_int32,
82 sys::getSwappedBytes(sys::getSwappedBytes(original_int32)));
84 original_int64 = static_cast<int64_t>(value);
85 EXPECT_EQ(original_int64,
86 sys::getSwappedBytes(sys::getSwappedBytes(original_int64)));
88 // Return to normal sign and twiddle.
90 value = (value << 8) | 0x55; // binary 0101 0101.
94 TEST(getSwappedBytes, uint8_t) {
95 EXPECT_EQ(uint8_t(0x11), sys::getSwappedBytes(uint8_t(0x11)));
98 TEST(getSwappedBytes, uint16_t) {
99 EXPECT_EQ(uint16_t(0x1122), sys::getSwappedBytes(uint16_t(0x2211)));
102 TEST(getSwappedBytes, uint32_t) {
103 EXPECT_EQ(uint32_t(0x11223344), sys::getSwappedBytes(uint32_t(0x44332211)));
106 TEST(getSwappedBytes, uint64_t) {
107 EXPECT_EQ(uint64_t(0x1122334455667788ULL),
108 sys::getSwappedBytes(uint64_t(0x8877665544332211ULL)));
111 TEST(getSwappedBytes, int8_t) {
112 EXPECT_EQ(int8_t(0x11), sys::getSwappedBytes(int8_t(0x11)));
115 TEST(getSwappedBytes, int16_t) {
116 EXPECT_EQ(int16_t(0x1122), sys::getSwappedBytes(int16_t(0x2211)));
119 TEST(getSwappedBytes, int32_t) {
120 EXPECT_EQ(int32_t(0x11223344), sys::getSwappedBytes(int32_t(0x44332211)));
123 TEST(getSwappedBytes, int64_t) {
124 EXPECT_EQ(int64_t(0x1122334455667788LL),
125 sys::getSwappedBytes(int64_t(0x8877665544332211LL)));
128 TEST(getSwappedBytes, float) {
129 EXPECT_EQ(1.79366203433576585078237386661e-43f, sys::getSwappedBytes(-0.0f));
131 EXPECT_EQ(7.1653228759765625e2f, sys::getSwappedBytes(1.2795344e-28f));
134 TEST(getSwappedBytes, double) {
135 EXPECT_EQ(6.32404026676795576546008054871e-322, sys::getSwappedBytes(-0.0));
136 // 0x1122334455667788
137 EXPECT_EQ(-7.08687663657301358331704585496e-268,
138 sys::getSwappedBytes(3.84141202447173065923064450234e-226));
141 TEST(swapByteOrder, uint8_t) {
142 uint8_t value = 0x11;
143 sys::swapByteOrder(value);
144 EXPECT_EQ(uint8_t(0x11), value);
147 TEST(swapByteOrder, uint16_t) {
148 uint16_t value = 0x2211;
149 sys::swapByteOrder(value);
150 EXPECT_EQ(uint16_t(0x1122), value);
153 TEST(swapByteOrder, uint32_t) {
154 uint32_t value = 0x44332211;
155 sys::swapByteOrder(value);
156 EXPECT_EQ(uint32_t(0x11223344), value);
159 TEST(swapByteOrder, uint64_t) {
160 uint64_t value = 0x8877665544332211ULL;
161 sys::swapByteOrder(value);
162 EXPECT_EQ(uint64_t(0x1122334455667788ULL), value);
165 TEST(swapByteOrder, int8_t) {
167 sys::swapByteOrder(value);
168 EXPECT_EQ(int8_t(0x11), value);
171 TEST(swapByteOrder, int16_t) {
172 int16_t value = 0x2211;
173 sys::swapByteOrder(value);
174 EXPECT_EQ(int16_t(0x1122), value);
177 TEST(swapByteOrder, int32_t) {
178 int32_t value = 0x44332211;
179 sys::swapByteOrder(value);
180 EXPECT_EQ(int32_t(0x11223344), value);
183 TEST(swapByteOrder, int64_t) {
184 int64_t value = 0x8877665544332211LL;
185 sys::swapByteOrder(value);
186 EXPECT_EQ(int64_t(0x1122334455667788LL), value);
189 TEST(swapByteOrder, float) {
190 float value = 7.1653228759765625e2f; // 0x44332211
191 sys::swapByteOrder(value);
192 EXPECT_EQ(1.2795344e-28f, value);
195 TEST(swapByteOrder, double) {
196 double value = -7.08687663657301358331704585496e-268; // 0x8877665544332211
197 sys::swapByteOrder(value);
198 EXPECT_EQ(3.84141202447173065923064450234e-226, value);