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 "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
  23 TEST(SwapByteOrder, 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::SwapByteOrder(sys::SwapByteOrder(original_uint8)));
  31
  32     uint16_t original_uint16 = static_cast<uint16_t>(value);
  33     EXPECT_EQ(original_uint16,
  34               sys::SwapByteOrder(sys::SwapByteOrder(original_uint16)));
  35
  36     uint32_t original_uint32 = static_cast<uint32_t>(value);
  37     EXPECT_EQ(original_uint32,
  38               sys::SwapByteOrder(sys::SwapByteOrder(original_uint32)));
  39
  40     uint64_t original_uint64 = static_cast<uint64_t>(value);
  41     EXPECT_EQ(original_uint64,
  42               sys::SwapByteOrder(sys::SwapByteOrder(original_uint64)));
  43
  44     value = (value << 8) | 0x55; // binary 0101 0101.
  45   }
  46 }
  47
  48 TEST(SwapByteOrder, 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::SwapByteOrder(sys::SwapByteOrder(original_int8)));
  56
  57     int16_t original_int16 = static_cast<int16_t>(value);
  58     EXPECT_EQ(original_int16,
  59               sys::SwapByteOrder(sys::SwapByteOrder(original_int16)));
  60
  61     int32_t original_int32 = static_cast<int32_t>(value);
  62     EXPECT_EQ(original_int32,
  63               sys::SwapByteOrder(sys::SwapByteOrder(original_int32)));
  64
  65     int64_t original_int64 = static_cast<int64_t>(value);
  66     EXPECT_EQ(original_int64,
  67               sys::SwapByteOrder(sys::SwapByteOrder(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::SwapByteOrder(sys::SwapByteOrder(original_int8)));
  75
  76     original_int16 = static_cast<int16_t>(value);
  77     EXPECT_EQ(original_int16,
  78               sys::SwapByteOrder(sys::SwapByteOrder(original_int16)));
  79
  80     original_int32 = static_cast<int32_t>(value);
  81     EXPECT_EQ(original_int32,
  82               sys::SwapByteOrder(sys::SwapByteOrder(original_int32)));
  83
  84     original_int64 = static_cast<int64_t>(value);
  85     EXPECT_EQ(original_int64,
  86               sys::SwapByteOrder(sys::SwapByteOrder(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(SwapByteOrder, uint8_t) {
  95   EXPECT_EQ(uint8_t(0x11), sys::SwapByteOrder(uint8_t(0x11)));
  96 }
  97
  98 TEST(SwapByteOrder, uint16_t) {
  99   EXPECT_EQ(uint16_t(0x1122), sys::SwapByteOrder(uint16_t(0x2211)));
 100 }
 101
 102 TEST(SwapByteOrder, uint32_t) {
 103   EXPECT_EQ(uint32_t(0x11223344), sys::SwapByteOrder(uint32_t(0x44332211)));
 104 }
 105
 106 TEST(SwapByteOrder, uint64_t) {
 107   EXPECT_EQ(uint64_t(0x1122334455667788ULL),
 108     sys::SwapByteOrder(uint64_t(0x8877665544332211ULL)));
 109 }
 110
 111 TEST(SwapByteOrder, int8_t) {
 112   EXPECT_EQ(int8_t(0x11), sys::SwapByteOrder(int8_t(0x11)));
 113 }
 114
 115 TEST(SwapByteOrder, int16_t) {
 116   EXPECT_EQ(int16_t(0x1122), sys::SwapByteOrder(int16_t(0x2211)));
 117 }
 118
 119 TEST(SwapByteOrder, int32_t) {
 120   EXPECT_EQ(int32_t(0x11223344), sys::SwapByteOrder(int32_t(0x44332211)));
 121 }
 122
 123 TEST(SwapByteOrder, int64_t) {
 124   EXPECT_EQ(int64_t(0x1122334455667788LL),
 125     sys::SwapByteOrder(int64_t(0x8877665544332211LL)));
 126 }
 127
 128 }