llvm/unittests/Support/SwapByteOrderTest.cpp

   1 //===- unittests/Support/SwapByteOrderTest.cpp - swap byte order test -----===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "llvm/Support/SwapByteOrder.h"
  10 #include "gtest/gtest.h"
  11 #include <cstdlib>
  12 #include <ctime>
  13 using namespace llvm;
  14
  15 #undef max
  16
  17 namespace {
  18
  19 TEST(ByteSwap, Swap_32) {
  20   EXPECT_EQ(0x44332211u, ByteSwap_32(0x11223344));
  21   EXPECT_EQ(0xDDCCBBAAu, ByteSwap_32(0xAABBCCDD));
  22 }
  23
  24 TEST(ByteSwap, Swap_64) {
  25   EXPECT_EQ(0x8877665544332211ULL, ByteSwap_64(0x1122334455667788LL));
  26   EXPECT_EQ(0x1100FFEEDDCCBBAAULL, ByteSwap_64(0xAABBCCDDEEFF0011LL));
  27 }
  28
  29 // In these first two tests all of the original_uintx values are truncated
  30 // except for 64. We could avoid this, but there's really no point.
  31
  32 TEST(getSwappedBytes, UnsignedRoundTrip) {
  33   // The point of the bit twiddling of magic is to test with and without bits
  34   // in every byte.
  35   uint64_t value = 1;
  36   for (std::size_t i = 0; i <= sizeof(value); ++i) {
  37     uint8_t original_uint8 = static_cast<uint8_t>(value);
  38     EXPECT_EQ(original_uint8,
  39               sys::getSwappedBytes(sys::getSwappedBytes(original_uint8)));
  40
  41     uint16_t original_uint16 = static_cast<uint16_t>(value);
  42     EXPECT_EQ(original_uint16,
  43               sys::getSwappedBytes(sys::getSwappedBytes(original_uint16)));
  44
  45     uint32_t original_uint32 = static_cast<uint32_t>(value);
  46     EXPECT_EQ(original_uint32,
  47               sys::getSwappedBytes(sys::getSwappedBytes(original_uint32)));
  48
  49     uint64_t original_uint64 = static_cast<uint64_t>(value);
  50     EXPECT_EQ(original_uint64,
  51               sys::getSwappedBytes(sys::getSwappedBytes(original_uint64)));
  52
  53     value = (value << 8) | 0x55; // binary 0101 0101.
  54   }
  55 }
  56
  57 TEST(getSwappedBytes, SignedRoundTrip) {
  58   // The point of the bit twiddling of magic is to test with and without bits
  59   // in every byte.
  60   uint64_t value = 1;
  61   for (std::size_t i = 0; i <= sizeof(value); ++i) {
  62     int8_t original_int8 = static_cast<int8_t>(value);
  63     EXPECT_EQ(original_int8,
  64               sys::getSwappedBytes(sys::getSwappedBytes(original_int8)));
  65
  66     int16_t original_int16 = static_cast<int16_t>(value);
  67     EXPECT_EQ(original_int16,
  68               sys::getSwappedBytes(sys::getSwappedBytes(original_int16)));
  69
  70     int32_t original_int32 = static_cast<int32_t>(value);
  71     EXPECT_EQ(original_int32,
  72               sys::getSwappedBytes(sys::getSwappedBytes(original_int32)));
  73
  74     int64_t original_int64 = static_cast<int64_t>(value);
  75     EXPECT_EQ(original_int64,
  76               sys::getSwappedBytes(sys::getSwappedBytes(original_int64)));
  77
  78     // Test other sign.
  79     value *= -1;
  80
  81     original_int8 = static_cast<int8_t>(value);
  82     EXPECT_EQ(original_int8,
  83               sys::getSwappedBytes(sys::getSwappedBytes(original_int8)));
  84
  85     original_int16 = static_cast<int16_t>(value);
  86     EXPECT_EQ(original_int16,
  87               sys::getSwappedBytes(sys::getSwappedBytes(original_int16)));
  88
  89     original_int32 = static_cast<int32_t>(value);
  90     EXPECT_EQ(original_int32,
  91               sys::getSwappedBytes(sys::getSwappedBytes(original_int32)));
  92
  93     original_int64 = static_cast<int64_t>(value);
  94     EXPECT_EQ(original_int64,
  95               sys::getSwappedBytes(sys::getSwappedBytes(original_int64)));
  96
  97     // Return to normal sign and twiddle.
  98     value *= -1;
  99     value = (value << 8) | 0x55; // binary 0101 0101.
 100   }
 101 }
 102
 103 TEST(getSwappedBytes, uint8_t) {
 104   EXPECT_EQ(uint8_t(0x11), sys::getSwappedBytes(uint8_t(0x11)));
 105 }
 106
 107 TEST(getSwappedBytes, uint16_t) {
 108   EXPECT_EQ(uint16_t(0x1122), sys::getSwappedBytes(uint16_t(0x2211)));
 109 }
 110
 111 TEST(getSwappedBytes, uint32_t) {
 112   EXPECT_EQ(uint32_t(0x11223344), sys::getSwappedBytes(uint32_t(0x44332211)));
 113 }
 114
 115 TEST(getSwappedBytes, uint64_t) {
 116   EXPECT_EQ(uint64_t(0x1122334455667788ULL),
 117     sys::getSwappedBytes(uint64_t(0x8877665544332211ULL)));
 118 }
 119
 120 TEST(getSwappedBytes, int8_t) {
 121   EXPECT_EQ(int8_t(0x11), sys::getSwappedBytes(int8_t(0x11)));
 122 }
 123
 124 TEST(getSwappedBytes, int16_t) {
 125   EXPECT_EQ(int16_t(0x1122), sys::getSwappedBytes(int16_t(0x2211)));
 126 }
 127
 128 TEST(getSwappedBytes, int32_t) {
 129   EXPECT_EQ(int32_t(0x11223344), sys::getSwappedBytes(int32_t(0x44332211)));
 130 }
 131
 132 TEST(getSwappedBytes, int64_t) {
 133   EXPECT_EQ(int64_t(0x1122334455667788LL),
 134     sys::getSwappedBytes(int64_t(0x8877665544332211LL)));
 135 }
 136
 137 TEST(getSwappedBytes, float) {
 138   EXPECT_EQ(1.79366203433576585078237386661e-43f, sys::getSwappedBytes(-0.0f));
 139   // 0x11223344
 140   EXPECT_EQ(7.1653228759765625e2f, sys::getSwappedBytes(1.2795344e-28f));
 141 }
 142
 143 TEST(getSwappedBytes, double) {
 144   EXPECT_EQ(6.32404026676795576546008054871e-322, sys::getSwappedBytes(-0.0));
 145   // 0x1122334455667788
 146   EXPECT_EQ(-7.08687663657301358331704585496e-268,
 147     sys::getSwappedBytes(3.84141202447173065923064450234e-226));
 148 }
 149
 150 TEST(swapByteOrder, uint8_t) {
 151   uint8_t value = 0x11;
 152   sys::swapByteOrder(value);
 153   EXPECT_EQ(uint8_t(0x11), value);
 154 }
 155
 156 TEST(swapByteOrder, uint16_t) {
 157   uint16_t value = 0x2211;
 158   sys::swapByteOrder(value);
 159   EXPECT_EQ(uint16_t(0x1122), value);
 160 }
 161
 162 TEST(swapByteOrder, uint32_t) {
 163   uint32_t value = 0x44332211;
 164   sys::swapByteOrder(value);
 165   EXPECT_EQ(uint32_t(0x11223344), value);
 166 }
 167
 168 TEST(swapByteOrder, uint64_t) {
 169   uint64_t value = 0x8877665544332211ULL;
 170   sys::swapByteOrder(value);
 171   EXPECT_EQ(uint64_t(0x1122334455667788ULL), value);
 172 }
 173
 174 TEST(swapByteOrder, int8_t) {
 175   int8_t value = 0x11;
 176   sys::swapByteOrder(value);
 177   EXPECT_EQ(int8_t(0x11), value);
 178 }
 179
 180 TEST(swapByteOrder, int16_t) {
 181   int16_t value = 0x2211;
 182   sys::swapByteOrder(value);
 183   EXPECT_EQ(int16_t(0x1122), value);
 184 }
 185
 186 TEST(swapByteOrder, int32_t) {
 187   int32_t value = 0x44332211;
 188   sys::swapByteOrder(value);
 189   EXPECT_EQ(int32_t(0x11223344), value);
 190 }
 191
 192 TEST(swapByteOrder, int64_t) {
 193   int64_t value = 0x8877665544332211LL;
 194   sys::swapByteOrder(value);
 195   EXPECT_EQ(int64_t(0x1122334455667788LL), value);
 196 }
 197
 198 TEST(swapByteOrder, float) {
 199   float value = 7.1653228759765625e2f; // 0x44332211
 200   sys::swapByteOrder(value);
 201   EXPECT_EQ(1.2795344e-28f, value);
 202 }
 203
 204 TEST(swapByteOrder, double) {
 205   double value = -7.08687663657301358331704585496e-268; // 0x8877665544332211
 206   sys::swapByteOrder(value);
 207   EXPECT_EQ(3.84141202447173065923064450234e-226, value);
 208 }
 209
 210 }