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comparison unittests/Support/EndianTest.cpp @ 0:95c75e76d11b LLVM3.4

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LLVM 3.4
author Kaito Tokumori <e105711@ie.u-ryukyu.ac.jp>
date Thu, 12 Dec 2013 13:56:28 +0900
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children afa8332a0e37
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-1:000000000000 0:95c75e76d11b
1 //===- unittests/Support/EndianTest.cpp - Endian.h tests ------------------===//
2 //
3 // The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9
10 #include "llvm/Support/Endian.h"
11 #include "llvm/Support/DataTypes.h"
12 #include "gtest/gtest.h"
13 #include <cstdlib>
14 #include <ctime>
15 using namespace llvm;
16 using namespace support;
17
18 #undef max
19
20 namespace {
21
22 TEST(Endian, Read) {
23 // These are 5 bytes so we can be sure at least one of the reads is unaligned.
24 unsigned char bigval[] = {0x00, 0x01, 0x02, 0x03, 0x04};
25 unsigned char littleval[] = {0x00, 0x04, 0x03, 0x02, 0x01};
26 int32_t BigAsHost = 0x00010203;
27 EXPECT_EQ(BigAsHost, (endian::read<int32_t, big, unaligned>(bigval)));
28 int32_t LittleAsHost = 0x02030400;
29 EXPECT_EQ(LittleAsHost,(endian::read<int32_t, little, unaligned>(littleval)));
30
31 EXPECT_EQ((endian::read<int32_t, big, unaligned>(bigval + 1)),
32 (endian::read<int32_t, little, unaligned>(littleval + 1)));
33 }
34
35 TEST(Endian, Write) {
36 unsigned char data[5];
37 endian::write<int32_t, big, unaligned>(data, -1362446643);
38 EXPECT_EQ(data[0], 0xAE);
39 EXPECT_EQ(data[1], 0xCA);
40 EXPECT_EQ(data[2], 0xB6);
41 EXPECT_EQ(data[3], 0xCD);
42 endian::write<int32_t, big, unaligned>(data + 1, -1362446643);
43 EXPECT_EQ(data[1], 0xAE);
44 EXPECT_EQ(data[2], 0xCA);
45 EXPECT_EQ(data[3], 0xB6);
46 EXPECT_EQ(data[4], 0xCD);
47
48 endian::write<int32_t, little, unaligned>(data, -1362446643);
49 EXPECT_EQ(data[0], 0xCD);
50 EXPECT_EQ(data[1], 0xB6);
51 EXPECT_EQ(data[2], 0xCA);
52 EXPECT_EQ(data[3], 0xAE);
53 endian::write<int32_t, little, unaligned>(data + 1, -1362446643);
54 EXPECT_EQ(data[1], 0xCD);
55 EXPECT_EQ(data[2], 0xB6);
56 EXPECT_EQ(data[3], 0xCA);
57 EXPECT_EQ(data[4], 0xAE);
58 }
59
60 TEST(Endian, PackedEndianSpecificIntegral) {
61 // These are 5 bytes so we can be sure at least one of the reads is unaligned.
62 unsigned char big[] = {0x00, 0x01, 0x02, 0x03, 0x04};
63 unsigned char little[] = {0x00, 0x04, 0x03, 0x02, 0x01};
64 big32_t *big_val =
65 reinterpret_cast<big32_t *>(big + 1);
66 little32_t *little_val =
67 reinterpret_cast<little32_t *>(little + 1);
68
69 EXPECT_EQ(*big_val, *little_val);
70 }
71
72 } // end anon namespace