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/System/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 origional_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 origional_uint8 = static_cast<uint8_t>(value);
  29     EXPECT_EQ(origional_uint8,
  30       sys::SwapByteOrder(sys::SwapByteOrder(origional_uint8)));
  31
  32     uint16_t origional_uint16 = static_cast<uint16_t>(value);
  33     EXPECT_EQ(origional_uint16,
  34       sys::SwapByteOrder(sys::SwapByteOrder(origional_uint16)));
  35
  36     uint32_t origional_uint32 = static_cast<uint32_t>(value);
  37     EXPECT_EQ(origional_uint32,
  38       sys::SwapByteOrder(sys::SwapByteOrder(origional_uint32)));
  39
  40     uint64_t origional_uint64 = static_cast<uint64_t>(value);
  41     EXPECT_EQ(origional_uint64,
  42       sys::SwapByteOrder(sys::SwapByteOrder(origional_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 origional_int8 = static_cast<int8_t>(value);
  54     EXPECT_EQ(origional_int8,
  55       sys::SwapByteOrder(sys::SwapByteOrder(origional_int8)));
  56
  57     int16_t origional_int16 = static_cast<int16_t>(value);
  58     EXPECT_EQ(origional_int16,
  59       sys::SwapByteOrder(sys::SwapByteOrder(origional_int16)));
  60
  61     int32_t origional_int32 = static_cast<int32_t>(value);
  62     EXPECT_EQ(origional_int32,
  63       sys::SwapByteOrder(sys::SwapByteOrder(origional_int32)));
  64
  65     int64_t origional_int64 = static_cast<int64_t>(value);
  66     EXPECT_EQ(origional_int64,
  67       sys::SwapByteOrder(sys::SwapByteOrder(origional_int64)));
  68
  69     // Test other sign.
  70     value *= -1;
  71
  72     origional_int8 = static_cast<int8_t>(value);
  73     EXPECT_EQ(origional_int8,
  74       sys::SwapByteOrder(sys::SwapByteOrder(origional_int8)));
  75
  76     origional_int16 = static_cast<int16_t>(value);
  77     EXPECT_EQ(origional_int16,
  78       sys::SwapByteOrder(sys::SwapByteOrder(origional_int16)));
  79
  80     origional_int32 = static_cast<int32_t>(value);
  81     EXPECT_EQ(origional_int32,
  82       sys::SwapByteOrder(sys::SwapByteOrder(origional_int32)));
  83
  84     origional_int64 = static_cast<int64_t>(value);
  85     EXPECT_EQ(origional_int64,
  86       sys::SwapByteOrder(sys::SwapByteOrder(origional_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 }