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      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 }
    202