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The next commit will add swapByteOrder(), acting in-place git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210973 91177308-0d34-0410-b5e6-96231b3b80d8
129 lines
4.1 KiB
C++
129 lines
4.1 KiB
C++
//===- unittests/Support/SwapByteOrderTest.cpp - swap byte order test -----===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#include "gtest/gtest.h"
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#include "llvm/Support/SwapByteOrder.h"
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#include <cstdlib>
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#include <ctime>
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using namespace llvm;
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#undef max
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namespace {
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// In these first two tests all of the original_uintx values are truncated
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// except for 64. We could avoid this, but there's really no point.
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TEST(getSwappedBytes, UnsignedRoundTrip) {
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// The point of the bit twiddling of magic is to test with and without bits
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// in every byte.
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uint64_t value = 1;
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for (std::size_t i = 0; i <= sizeof(value); ++i) {
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uint8_t original_uint8 = static_cast<uint8_t>(value);
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EXPECT_EQ(original_uint8,
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sys::getSwappedBytes(sys::getSwappedBytes(original_uint8)));
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uint16_t original_uint16 = static_cast<uint16_t>(value);
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EXPECT_EQ(original_uint16,
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sys::getSwappedBytes(sys::getSwappedBytes(original_uint16)));
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uint32_t original_uint32 = static_cast<uint32_t>(value);
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EXPECT_EQ(original_uint32,
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sys::getSwappedBytes(sys::getSwappedBytes(original_uint32)));
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uint64_t original_uint64 = static_cast<uint64_t>(value);
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EXPECT_EQ(original_uint64,
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sys::getSwappedBytes(sys::getSwappedBytes(original_uint64)));
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value = (value << 8) | 0x55; // binary 0101 0101.
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}
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}
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TEST(getSwappedBytes, SignedRoundTrip) {
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// The point of the bit twiddling of magic is to test with and without bits
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// in every byte.
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uint64_t value = 1;
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for (std::size_t i = 0; i <= sizeof(value); ++i) {
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int8_t original_int8 = static_cast<int8_t>(value);
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EXPECT_EQ(original_int8,
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sys::getSwappedBytes(sys::getSwappedBytes(original_int8)));
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int16_t original_int16 = static_cast<int16_t>(value);
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EXPECT_EQ(original_int16,
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sys::getSwappedBytes(sys::getSwappedBytes(original_int16)));
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int32_t original_int32 = static_cast<int32_t>(value);
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EXPECT_EQ(original_int32,
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sys::getSwappedBytes(sys::getSwappedBytes(original_int32)));
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int64_t original_int64 = static_cast<int64_t>(value);
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EXPECT_EQ(original_int64,
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sys::getSwappedBytes(sys::getSwappedBytes(original_int64)));
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// Test other sign.
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value *= -1;
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original_int8 = static_cast<int8_t>(value);
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EXPECT_EQ(original_int8,
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sys::getSwappedBytes(sys::getSwappedBytes(original_int8)));
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original_int16 = static_cast<int16_t>(value);
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EXPECT_EQ(original_int16,
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sys::getSwappedBytes(sys::getSwappedBytes(original_int16)));
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original_int32 = static_cast<int32_t>(value);
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EXPECT_EQ(original_int32,
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sys::getSwappedBytes(sys::getSwappedBytes(original_int32)));
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original_int64 = static_cast<int64_t>(value);
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EXPECT_EQ(original_int64,
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sys::getSwappedBytes(sys::getSwappedBytes(original_int64)));
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// Return to normal sign and twiddle.
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value *= -1;
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value = (value << 8) | 0x55; // binary 0101 0101.
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}
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}
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TEST(getSwappedBytes, uint8_t) {
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EXPECT_EQ(uint8_t(0x11), sys::getSwappedBytes(uint8_t(0x11)));
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}
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TEST(getSwappedBytes, uint16_t) {
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EXPECT_EQ(uint16_t(0x1122), sys::getSwappedBytes(uint16_t(0x2211)));
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}
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TEST(getSwappedBytes, uint32_t) {
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EXPECT_EQ(uint32_t(0x11223344), sys::getSwappedBytes(uint32_t(0x44332211)));
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}
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TEST(getSwappedBytes, uint64_t) {
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EXPECT_EQ(uint64_t(0x1122334455667788ULL),
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sys::getSwappedBytes(uint64_t(0x8877665544332211ULL)));
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}
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TEST(getSwappedBytes, int8_t) {
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EXPECT_EQ(int8_t(0x11), sys::getSwappedBytes(int8_t(0x11)));
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}
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TEST(getSwappedBytes, int16_t) {
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EXPECT_EQ(int16_t(0x1122), sys::getSwappedBytes(int16_t(0x2211)));
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}
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TEST(getSwappedBytes, int32_t) {
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EXPECT_EQ(int32_t(0x11223344), sys::getSwappedBytes(int32_t(0x44332211)));
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}
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TEST(getSwappedBytes, int64_t) {
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EXPECT_EQ(int64_t(0x1122334455667788LL),
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sys::getSwappedBytes(int64_t(0x8877665544332211LL)));
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}
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}
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