libc/test/src/__support/endian_internal_test.cpp

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