• Home
  • Line#
  • Scopes#
  • Navigate#
  • Raw
  • Download
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 original_uintx values are truncated
21 // except for 64. We could avoid this, but there's really no point.
22 
TEST(getSwappedBytes,UnsignedRoundTrip)23 TEST(getSwappedBytes, 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 original_uint8 = static_cast<uint8_t>(value);
29     EXPECT_EQ(original_uint8,
30               sys::getSwappedBytes(sys::getSwappedBytes(original_uint8)));
31 
32     uint16_t original_uint16 = static_cast<uint16_t>(value);
33     EXPECT_EQ(original_uint16,
34               sys::getSwappedBytes(sys::getSwappedBytes(original_uint16)));
35 
36     uint32_t original_uint32 = static_cast<uint32_t>(value);
37     EXPECT_EQ(original_uint32,
38               sys::getSwappedBytes(sys::getSwappedBytes(original_uint32)));
39 
40     uint64_t original_uint64 = static_cast<uint64_t>(value);
41     EXPECT_EQ(original_uint64,
42               sys::getSwappedBytes(sys::getSwappedBytes(original_uint64)));
43 
44     value = (value << 8) | 0x55; // binary 0101 0101.
45   }
46 }
47 
TEST(getSwappedBytes,SignedRoundTrip)48 TEST(getSwappedBytes, 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 original_int8 = static_cast<int8_t>(value);
54     EXPECT_EQ(original_int8,
55               sys::getSwappedBytes(sys::getSwappedBytes(original_int8)));
56 
57     int16_t original_int16 = static_cast<int16_t>(value);
58     EXPECT_EQ(original_int16,
59               sys::getSwappedBytes(sys::getSwappedBytes(original_int16)));
60 
61     int32_t original_int32 = static_cast<int32_t>(value);
62     EXPECT_EQ(original_int32,
63               sys::getSwappedBytes(sys::getSwappedBytes(original_int32)));
64 
65     int64_t original_int64 = static_cast<int64_t>(value);
66     EXPECT_EQ(original_int64,
67               sys::getSwappedBytes(sys::getSwappedBytes(original_int64)));
68 
69     // Test other sign.
70     value *= -1;
71 
72     original_int8 = static_cast<int8_t>(value);
73     EXPECT_EQ(original_int8,
74               sys::getSwappedBytes(sys::getSwappedBytes(original_int8)));
75 
76     original_int16 = static_cast<int16_t>(value);
77     EXPECT_EQ(original_int16,
78               sys::getSwappedBytes(sys::getSwappedBytes(original_int16)));
79 
80     original_int32 = static_cast<int32_t>(value);
81     EXPECT_EQ(original_int32,
82               sys::getSwappedBytes(sys::getSwappedBytes(original_int32)));
83 
84     original_int64 = static_cast<int64_t>(value);
85     EXPECT_EQ(original_int64,
86               sys::getSwappedBytes(sys::getSwappedBytes(original_int64)));
87 
88     // Return to normal sign and twiddle.
89     value *= -1;
90     value = (value << 8) | 0x55; // binary 0101 0101.
91   }
92 }
93 
TEST(getSwappedBytes,uint8_t)94 TEST(getSwappedBytes, uint8_t) {
95   EXPECT_EQ(uint8_t(0x11), sys::getSwappedBytes(uint8_t(0x11)));
96 }
97 
TEST(getSwappedBytes,uint16_t)98 TEST(getSwappedBytes, uint16_t) {
99   EXPECT_EQ(uint16_t(0x1122), sys::getSwappedBytes(uint16_t(0x2211)));
100 }
101 
TEST(getSwappedBytes,uint32_t)102 TEST(getSwappedBytes, uint32_t) {
103   EXPECT_EQ(uint32_t(0x11223344), sys::getSwappedBytes(uint32_t(0x44332211)));
104 }
105 
TEST(getSwappedBytes,uint64_t)106 TEST(getSwappedBytes, uint64_t) {
107   EXPECT_EQ(uint64_t(0x1122334455667788ULL),
108     sys::getSwappedBytes(uint64_t(0x8877665544332211ULL)));
109 }
110 
TEST(getSwappedBytes,int8_t)111 TEST(getSwappedBytes, int8_t) {
112   EXPECT_EQ(int8_t(0x11), sys::getSwappedBytes(int8_t(0x11)));
113 }
114 
TEST(getSwappedBytes,int16_t)115 TEST(getSwappedBytes, int16_t) {
116   EXPECT_EQ(int16_t(0x1122), sys::getSwappedBytes(int16_t(0x2211)));
117 }
118 
TEST(getSwappedBytes,int32_t)119 TEST(getSwappedBytes, int32_t) {
120   EXPECT_EQ(int32_t(0x11223344), sys::getSwappedBytes(int32_t(0x44332211)));
121 }
122 
TEST(getSwappedBytes,int64_t)123 TEST(getSwappedBytes, int64_t) {
124   EXPECT_EQ(int64_t(0x1122334455667788LL),
125     sys::getSwappedBytes(int64_t(0x8877665544332211LL)));
126 }
127 
TEST(getSwappedBytes,float)128 TEST(getSwappedBytes, float) {
129   EXPECT_EQ(1.79366203433576585078237386661e-43f, sys::getSwappedBytes(-0.0f));
130   // 0x11223344
131   EXPECT_EQ(7.1653228759765625e2f, sys::getSwappedBytes(1.2795344e-28f));
132 }
133 
TEST(getSwappedBytes,double)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));
139 }
140 
TEST(swapByteOrder,uint8_t)141 TEST(swapByteOrder, uint8_t) {
142   uint8_t value = 0x11;
143   sys::swapByteOrder(value);
144   EXPECT_EQ(uint8_t(0x11), value);
145 }
146 
TEST(swapByteOrder,uint16_t)147 TEST(swapByteOrder, uint16_t) {
148   uint16_t value = 0x2211;
149   sys::swapByteOrder(value);
150   EXPECT_EQ(uint16_t(0x1122), value);
151 }
152 
TEST(swapByteOrder,uint32_t)153 TEST(swapByteOrder, uint32_t) {
154   uint32_t value = 0x44332211;
155   sys::swapByteOrder(value);
156   EXPECT_EQ(uint32_t(0x11223344), value);
157 }
158 
TEST(swapByteOrder,uint64_t)159 TEST(swapByteOrder, uint64_t) {
160   uint64_t value = 0x8877665544332211ULL;
161   sys::swapByteOrder(value);
162   EXPECT_EQ(uint64_t(0x1122334455667788ULL), value);
163 }
164 
TEST(swapByteOrder,int8_t)165 TEST(swapByteOrder, int8_t) {
166   int8_t value = 0x11;
167   sys::swapByteOrder(value);
168   EXPECT_EQ(int8_t(0x11), value);
169 }
170 
TEST(swapByteOrder,int16_t)171 TEST(swapByteOrder, int16_t) {
172   int16_t value = 0x2211;
173   sys::swapByteOrder(value);
174   EXPECT_EQ(int16_t(0x1122), value);
175 }
176 
TEST(swapByteOrder,int32_t)177 TEST(swapByteOrder, int32_t) {
178   int32_t value = 0x44332211;
179   sys::swapByteOrder(value);
180   EXPECT_EQ(int32_t(0x11223344), value);
181 }
182 
TEST(swapByteOrder,int64_t)183 TEST(swapByteOrder, int64_t) {
184   int64_t value = 0x8877665544332211LL;
185   sys::swapByteOrder(value);
186   EXPECT_EQ(int64_t(0x1122334455667788LL), value);
187 }
188 
TEST(swapByteOrder,float)189 TEST(swapByteOrder, float) {
190   float value = 7.1653228759765625e2f; // 0x44332211
191   sys::swapByteOrder(value);
192   EXPECT_EQ(1.2795344e-28f, value);
193 }
194 
TEST(swapByteOrder,double)195 TEST(swapByteOrder, double) {
196   double value = -7.08687663657301358331704585496e-268; // 0x8877665544332211
197   sys::swapByteOrder(value);
198   EXPECT_EQ(3.84141202447173065923064450234e-226, value);
199 }
200 
201 }
202