201 lines · cpp
1//===- unittests/Support/SwapByteOrderTest.cpp - swap byte order test -----===//2//3// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.4// See https://llvm.org/LICENSE.txt for license information.5// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception6//7//===----------------------------------------------------------------------===//8 9#include "llvm/Support/SwapByteOrder.h"10#include "gtest/gtest.h"11#include <cstdlib>12#include <ctime>13using namespace llvm;14 15#undef max16 17namespace {18 19// In these first two tests all of the original_uintx values are truncated20// except for 64. We could avoid this, but there's really no point.21 22TEST(getSwappedBytes, UnsignedRoundTrip) {23 // The point of the bit twiddling of magic is to test with and without bits24 // in every byte.25 uint64_t value = 1;26 for (std::size_t i = 0; i <= sizeof(value); ++i) {27 uint8_t original_uint8 = static_cast<uint8_t>(value);28 EXPECT_EQ(original_uint8,29 sys::getSwappedBytes(sys::getSwappedBytes(original_uint8)));30 31 uint16_t original_uint16 = static_cast<uint16_t>(value);32 EXPECT_EQ(original_uint16,33 sys::getSwappedBytes(sys::getSwappedBytes(original_uint16)));34 35 uint32_t original_uint32 = static_cast<uint32_t>(value);36 EXPECT_EQ(original_uint32,37 sys::getSwappedBytes(sys::getSwappedBytes(original_uint32)));38 39 uint64_t original_uint64 = static_cast<uint64_t>(value);40 EXPECT_EQ(original_uint64,41 sys::getSwappedBytes(sys::getSwappedBytes(original_uint64)));42 43 value = (value << 8) | 0x55; // binary 0101 0101.44 }45}46 47TEST(getSwappedBytes, SignedRoundTrip) {48 // The point of the bit twiddling of magic is to test with and without bits49 // in every byte.50 uint64_t value = 1;51 for (std::size_t i = 0; i <= sizeof(value); ++i) {52 int8_t original_int8 = static_cast<int8_t>(value);53 EXPECT_EQ(original_int8,54 sys::getSwappedBytes(sys::getSwappedBytes(original_int8)));55 56 int16_t original_int16 = static_cast<int16_t>(value);57 EXPECT_EQ(original_int16,58 sys::getSwappedBytes(sys::getSwappedBytes(original_int16)));59 60 int32_t original_int32 = static_cast<int32_t>(value);61 EXPECT_EQ(original_int32,62 sys::getSwappedBytes(sys::getSwappedBytes(original_int32)));63 64 int64_t original_int64 = static_cast<int64_t>(value);65 EXPECT_EQ(original_int64,66 sys::getSwappedBytes(sys::getSwappedBytes(original_int64)));67 68 // Test other sign.69 value *= -1;70 71 original_int8 = static_cast<int8_t>(value);72 EXPECT_EQ(original_int8,73 sys::getSwappedBytes(sys::getSwappedBytes(original_int8)));74 75 original_int16 = static_cast<int16_t>(value);76 EXPECT_EQ(original_int16,77 sys::getSwappedBytes(sys::getSwappedBytes(original_int16)));78 79 original_int32 = static_cast<int32_t>(value);80 EXPECT_EQ(original_int32,81 sys::getSwappedBytes(sys::getSwappedBytes(original_int32)));82 83 original_int64 = static_cast<int64_t>(value);84 EXPECT_EQ(original_int64,85 sys::getSwappedBytes(sys::getSwappedBytes(original_int64)));86 87 // Return to normal sign and twiddle.88 value *= -1;89 value = (value << 8) | 0x55; // binary 0101 0101.90 }91}92 93TEST(getSwappedBytes, uint8_t) {94 EXPECT_EQ(uint8_t(0x11), sys::getSwappedBytes(uint8_t(0x11)));95}96 97TEST(getSwappedBytes, uint16_t) {98 EXPECT_EQ(uint16_t(0x1122), sys::getSwappedBytes(uint16_t(0x2211)));99}100 101TEST(getSwappedBytes, uint32_t) {102 EXPECT_EQ(uint32_t(0x11223344), sys::getSwappedBytes(uint32_t(0x44332211)));103}104 105TEST(getSwappedBytes, uint64_t) {106 EXPECT_EQ(uint64_t(0x1122334455667788ULL),107 sys::getSwappedBytes(uint64_t(0x8877665544332211ULL)));108}109 110TEST(getSwappedBytes, int8_t) {111 EXPECT_EQ(int8_t(0x11), sys::getSwappedBytes(int8_t(0x11)));112}113 114TEST(getSwappedBytes, int16_t) {115 EXPECT_EQ(int16_t(0x1122), sys::getSwappedBytes(int16_t(0x2211)));116}117 118TEST(getSwappedBytes, int32_t) {119 EXPECT_EQ(int32_t(0x11223344), sys::getSwappedBytes(int32_t(0x44332211)));120}121 122TEST(getSwappedBytes, int64_t) {123 EXPECT_EQ(int64_t(0x1122334455667788LL),124 sys::getSwappedBytes(int64_t(0x8877665544332211LL)));125}126 127TEST(getSwappedBytes, float) {128 EXPECT_EQ(1.79366203433576585078237386661e-43f, sys::getSwappedBytes(-0.0f));129 // 0x11223344130 EXPECT_EQ(7.1653228759765625e2f, sys::getSwappedBytes(1.2795344e-28f));131}132 133TEST(getSwappedBytes, double) {134 EXPECT_EQ(6.32404026676795576546008054871e-322, sys::getSwappedBytes(-0.0));135 // 0x1122334455667788136 EXPECT_EQ(-7.08687663657301358331704585496e-268,137 sys::getSwappedBytes(3.84141202447173065923064450234e-226));138}139 140TEST(swapByteOrder, uint8_t) {141 uint8_t value = 0x11;142 sys::swapByteOrder(value);143 EXPECT_EQ(uint8_t(0x11), value);144}145 146TEST(swapByteOrder, uint16_t) {147 uint16_t value = 0x2211;148 sys::swapByteOrder(value);149 EXPECT_EQ(uint16_t(0x1122), value);150}151 152TEST(swapByteOrder, uint32_t) {153 uint32_t value = 0x44332211;154 sys::swapByteOrder(value);155 EXPECT_EQ(uint32_t(0x11223344), value);156}157 158TEST(swapByteOrder, uint64_t) {159 uint64_t value = 0x8877665544332211ULL;160 sys::swapByteOrder(value);161 EXPECT_EQ(uint64_t(0x1122334455667788ULL), value);162}163 164TEST(swapByteOrder, int8_t) {165 int8_t value = 0x11;166 sys::swapByteOrder(value);167 EXPECT_EQ(int8_t(0x11), value);168}169 170TEST(swapByteOrder, int16_t) {171 int16_t value = 0x2211;172 sys::swapByteOrder(value);173 EXPECT_EQ(int16_t(0x1122), value);174}175 176TEST(swapByteOrder, int32_t) {177 int32_t value = 0x44332211;178 sys::swapByteOrder(value);179 EXPECT_EQ(int32_t(0x11223344), value);180}181 182TEST(swapByteOrder, int64_t) {183 int64_t value = 0x8877665544332211LL;184 sys::swapByteOrder(value);185 EXPECT_EQ(int64_t(0x1122334455667788LL), value);186}187 188TEST(swapByteOrder, float) {189 float value = 7.1653228759765625e2f; // 0x44332211190 sys::swapByteOrder(value);191 EXPECT_EQ(1.2795344e-28f, value);192}193 194TEST(swapByteOrder, double) {195 double value = -7.08687663657301358331704585496e-268; // 0x8877665544332211196 sys::swapByteOrder(value);197 EXPECT_EQ(3.84141202447173065923064450234e-226, value);198}199 200}201