1 //===-- Unittests for endian ----------------------------------------------===//
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-exception
6 //
7 //===----------------------------------------------------------------------===//
8 
9 #include "src/__support/endian.h"
10 #include "utils/UnitTest/Test.h"
11 
12 namespace __llvm_libc {
13 
14 struct LlvmLibcEndian : testing::Test {
15   template <typename T> void check(const T original, const T swapped) {
16 #if __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__
17     EXPECT_EQ(Endian::ToLittleEndian(original), original);
18     EXPECT_EQ(Endian::ToBigEndian(original), swapped);
19 #endif
20 #if __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__
21     EXPECT_EQ(Endian::ToBigEndian(original), original);
22     EXPECT_EQ(Endian::ToLittleEndian(original), swapped);
23 #endif
24   }
25 };
26 
27 TEST_F(LlvmLibcEndian, Field) {
28   EXPECT_EQ(Endian::isLittle, __BYTE_ORDER__ == __ORDER_LITTLE_ENDIAN__);
29   EXPECT_EQ(Endian::isBig, __BYTE_ORDER__ == __ORDER_BIG_ENDIAN__);
30 }
31 
32 TEST_F(LlvmLibcEndian, uint8_t) {
33   const uint8_t original = uint8_t(0x12);
34   check(original, original);
35 }
36 
37 TEST_F(LlvmLibcEndian, uint16_t) {
38   const uint16_t original = uint16_t(0x1234);
39   const uint16_t swapped = __builtin_bswap16(original);
40   check(original, swapped);
41 }
42 
43 TEST_F(LlvmLibcEndian, uint32_t) {
44   const uint32_t original = uint32_t(0x12345678);
45   const uint32_t swapped = __builtin_bswap32(original);
46   check(original, swapped);
47 }
48 
49 TEST_F(LlvmLibcEndian, uint64_t) {
50   const uint64_t original = uint64_t(0x123456789ABCDEF0);
51   const uint64_t swapped = __builtin_bswap64(original);
52   check(original, swapped);
53 }
54 
55 } // namespace __llvm_libc
56