unittests/Support/SwapByteOrderTest.cpp

   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 "llvm/Support/SwapByteOrder.h"
  11 #include "gtest/gtest.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
  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
  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
  94 TEST(getSwappedBytes, uint8_t) {
  95   EXPECT_EQ(uint8_t(0x11), sys::getSwappedBytes(uint8_t(0x11)));
  96 }
  97
  98 TEST(getSwappedBytes, uint16_t) {
  99   EXPECT_EQ(uint16_t(0x1122), sys::getSwappedBytes(uint16_t(0x2211)));
 100 }
 101
 102 TEST(getSwappedBytes, uint32_t) {
 103   EXPECT_EQ(uint32_t(0x11223344), sys::getSwappedBytes(uint32_t(0x44332211)));
 104 }
 105
 106 TEST(getSwappedBytes, uint64_t) {
 107   EXPECT_EQ(uint64_t(0x1122334455667788ULL),
 108     sys::getSwappedBytes(uint64_t(0x8877665544332211ULL)));
 109 }
 110
 111 TEST(getSwappedBytes, int8_t) {
 112   EXPECT_EQ(int8_t(0x11), sys::getSwappedBytes(int8_t(0x11)));
 113 }
 114
 115 TEST(getSwappedBytes, int16_t) {
 116   EXPECT_EQ(int16_t(0x1122), sys::getSwappedBytes(int16_t(0x2211)));
 117 }
 118
 119 TEST(getSwappedBytes, int32_t) {
 120   EXPECT_EQ(int32_t(0x11223344), sys::getSwappedBytes(int32_t(0x44332211)));
 121 }
 122
 123 TEST(getSwappedBytes, int64_t) {
 124   EXPECT_EQ(int64_t(0x1122334455667788LL),
 125     sys::getSwappedBytes(int64_t(0x8877665544332211LL)));
 126 }
 127
 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
 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
 141 TEST(swapByteOrder, uint8_t) {
 142   uint8_t value = 0x11;
 143   sys::swapByteOrder(value);
 144   EXPECT_EQ(uint8_t(0x11), value);
 145 }
 146
 147 TEST(swapByteOrder, uint16_t) {
 148   uint16_t value = 0x2211;
 149   sys::swapByteOrder(value);
 150   EXPECT_EQ(uint16_t(0x1122), value);
 151 }
 152
 153 TEST(swapByteOrder, uint32_t) {
 154   uint32_t value = 0x44332211;
 155   sys::swapByteOrder(value);
 156   EXPECT_EQ(uint32_t(0x11223344), value);
 157 }
 158
 159 TEST(swapByteOrder, uint64_t) {
 160   uint64_t value = 0x8877665544332211ULL;
 161   sys::swapByteOrder(value);
 162   EXPECT_EQ(uint64_t(0x1122334455667788ULL), value);
 163 }
 164
 165 TEST(swapByteOrder, int8_t) {
 166   int8_t value = 0x11;
 167   sys::swapByteOrder(value);
 168   EXPECT_EQ(int8_t(0x11), value);
 169 }
 170
 171 TEST(swapByteOrder, int16_t) {
 172   int16_t value = 0x2211;
 173   sys::swapByteOrder(value);
 174   EXPECT_EQ(int16_t(0x1122), value);
 175 }
 176
 177 TEST(swapByteOrder, int32_t) {
 178   int32_t value = 0x44332211;
 179   sys::swapByteOrder(value);
 180   EXPECT_EQ(int32_t(0x11223344), value);
 181 }
 182
 183 TEST(swapByteOrder, int64_t) {
 184   int64_t value = 0x8877665544332211LL;
 185   sys::swapByteOrder(value);
 186   EXPECT_EQ(int64_t(0x1122334455667788LL), value);
 187 }
 188
 189 TEST(swapByteOrder, float) {
 190   float value = 7.1653228759765625e2f; // 0x44332211
 191   sys::swapByteOrder(value);
 192   EXPECT_EQ(1.2795344e-28f, value);
 193 }
 194
 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 }