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//===- unittests/Support/SwapByteOrderTest.cpp - swap byte order test -----===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "gtest/gtest.h"
#include "llvm/Support/SwapByteOrder.h"
#include <cstdlib>
#include <ctime>
using namespace llvm;
#undef max
namespace {
// In these first two tests all of the original_uintx values are truncated
// except for 64. We could avoid this, but there's really no point.
TEST(getSwappedBytes, UnsignedRoundTrip) {
// The point of the bit twiddling of magic is to test with and without bits
// in every byte.
uint64_t value = 1;
for (std::size_t i = 0; i <= sizeof(value); ++i) {
uint8_t original_uint8 = static_cast<uint8_t>(value);
EXPECT_EQ(original_uint8,
sys::getSwappedBytes(sys::getSwappedBytes(original_uint8)));
uint16_t original_uint16 = static_cast<uint16_t>(value);
EXPECT_EQ(original_uint16,
sys::getSwappedBytes(sys::getSwappedBytes(original_uint16)));
uint32_t original_uint32 = static_cast<uint32_t>(value);
EXPECT_EQ(original_uint32,
sys::getSwappedBytes(sys::getSwappedBytes(original_uint32)));
uint64_t original_uint64 = static_cast<uint64_t>(value);
EXPECT_EQ(original_uint64,
sys::getSwappedBytes(sys::getSwappedBytes(original_uint64)));
value = (value << 8) | 0x55; // binary 0101 0101.
}
}
TEST(getSwappedBytes, SignedRoundTrip) {
// The point of the bit twiddling of magic is to test with and without bits
// in every byte.
uint64_t value = 1;
for (std::size_t i = 0; i <= sizeof(value); ++i) {
int8_t original_int8 = static_cast<int8_t>(value);
EXPECT_EQ(original_int8,
sys::getSwappedBytes(sys::getSwappedBytes(original_int8)));
int16_t original_int16 = static_cast<int16_t>(value);
EXPECT_EQ(original_int16,
sys::getSwappedBytes(sys::getSwappedBytes(original_int16)));
int32_t original_int32 = static_cast<int32_t>(value);
EXPECT_EQ(original_int32,
sys::getSwappedBytes(sys::getSwappedBytes(original_int32)));
int64_t original_int64 = static_cast<int64_t>(value);
EXPECT_EQ(original_int64,
sys::getSwappedBytes(sys::getSwappedBytes(original_int64)));
// Test other sign.
value *= -1;
original_int8 = static_cast<int8_t>(value);
EXPECT_EQ(original_int8,
sys::getSwappedBytes(sys::getSwappedBytes(original_int8)));
original_int16 = static_cast<int16_t>(value);
EXPECT_EQ(original_int16,
sys::getSwappedBytes(sys::getSwappedBytes(original_int16)));
original_int32 = static_cast<int32_t>(value);
EXPECT_EQ(original_int32,
sys::getSwappedBytes(sys::getSwappedBytes(original_int32)));
original_int64 = static_cast<int64_t>(value);
EXPECT_EQ(original_int64,
sys::getSwappedBytes(sys::getSwappedBytes(original_int64)));
// Return to normal sign and twiddle.
value *= -1;
value = (value << 8) | 0x55; // binary 0101 0101.
}
}
TEST(getSwappedBytes, uint8_t) {
EXPECT_EQ(uint8_t(0x11), sys::getSwappedBytes(uint8_t(0x11)));
}
TEST(getSwappedBytes, uint16_t) {
EXPECT_EQ(uint16_t(0x1122), sys::getSwappedBytes(uint16_t(0x2211)));
}
TEST(getSwappedBytes, uint32_t) {
EXPECT_EQ(uint32_t(0x11223344), sys::getSwappedBytes(uint32_t(0x44332211)));
}
TEST(getSwappedBytes, uint64_t) {
EXPECT_EQ(uint64_t(0x1122334455667788ULL),
sys::getSwappedBytes(uint64_t(0x8877665544332211ULL)));
}
TEST(getSwappedBytes, int8_t) {
EXPECT_EQ(int8_t(0x11), sys::getSwappedBytes(int8_t(0x11)));
}
TEST(getSwappedBytes, int16_t) {
EXPECT_EQ(int16_t(0x1122), sys::getSwappedBytes(int16_t(0x2211)));
}
TEST(getSwappedBytes, int32_t) {
EXPECT_EQ(int32_t(0x11223344), sys::getSwappedBytes(int32_t(0x44332211)));
}
TEST(getSwappedBytes, int64_t) {
EXPECT_EQ(int64_t(0x1122334455667788LL),
sys::getSwappedBytes(int64_t(0x8877665544332211LL)));
}
}
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