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//===- unittests/Support/SwapByteOrderTest.cpp - swap byte order test -----===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "llvm/Support/SwapByteOrder.h"
#include "gtest/gtest.h"
#include <cstdlib>
#include <ctime>
using namespace llvm;
#undef max
namespace {
TEST(ByteSwap, Swap_32) {
EXPECT_EQ(0x44332211u, ByteSwap_32(0x11223344));
EXPECT_EQ(0xDDCCBBAAu, ByteSwap_32(0xAABBCCDD));
}
TEST(ByteSwap, Swap_64) {
EXPECT_EQ(0x8877665544332211ULL, ByteSwap_64(0x1122334455667788LL));
EXPECT_EQ(0x1100FFEEDDCCBBAAULL, ByteSwap_64(0xAABBCCDDEEFF0011LL));
}
// 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)));
}
TEST(getSwappedBytes, float) {
EXPECT_EQ(1.79366203433576585078237386661e-43f, sys::getSwappedBytes(-0.0f));
// 0x11223344
EXPECT_EQ(7.1653228759765625e2f, sys::getSwappedBytes(1.2795344e-28f));
}
TEST(getSwappedBytes, double) {
EXPECT_EQ(6.32404026676795576546008054871e-322, sys::getSwappedBytes(-0.0));
// 0x1122334455667788
EXPECT_EQ(-7.08687663657301358331704585496e-268,
sys::getSwappedBytes(3.84141202447173065923064450234e-226));
}
TEST(swapByteOrder, uint8_t) {
uint8_t value = 0x11;
sys::swapByteOrder(value);
EXPECT_EQ(uint8_t(0x11), value);
}
TEST(swapByteOrder, uint16_t) {
uint16_t value = 0x2211;
sys::swapByteOrder(value);
EXPECT_EQ(uint16_t(0x1122), value);
}
TEST(swapByteOrder, uint32_t) {
uint32_t value = 0x44332211;
sys::swapByteOrder(value);
EXPECT_EQ(uint32_t(0x11223344), value);
}
TEST(swapByteOrder, uint64_t) {
uint64_t value = 0x8877665544332211ULL;
sys::swapByteOrder(value);
EXPECT_EQ(uint64_t(0x1122334455667788ULL), value);
}
TEST(swapByteOrder, int8_t) {
int8_t value = 0x11;
sys::swapByteOrder(value);
EXPECT_EQ(int8_t(0x11), value);
}
TEST(swapByteOrder, int16_t) {
int16_t value = 0x2211;
sys::swapByteOrder(value);
EXPECT_EQ(int16_t(0x1122), value);
}
TEST(swapByteOrder, int32_t) {
int32_t value = 0x44332211;
sys::swapByteOrder(value);
EXPECT_EQ(int32_t(0x11223344), value);
}
TEST(swapByteOrder, int64_t) {
int64_t value = 0x8877665544332211LL;
sys::swapByteOrder(value);
EXPECT_EQ(int64_t(0x1122334455667788LL), value);
}
TEST(swapByteOrder, float) {
float value = 7.1653228759765625e2f; // 0x44332211
sys::swapByteOrder(value);
EXPECT_EQ(1.2795344e-28f, value);
}
TEST(swapByteOrder, double) {
double value = -7.08687663657301358331704585496e-268; // 0x8877665544332211
sys::swapByteOrder(value);
EXPECT_EQ(3.84141202447173065923064450234e-226, value);
}
}
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