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[Support][Endian] Add support for specifying the alignment and native unaligned types.

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* Add support for specifying the alignment to use.
* Add the concept of native endianness. Used for unaligned native types.

The native alignment and read/write simplification is based on a patch by Richard Smith.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@171406 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Michael J. Spencer
2013-01-02 20:14:11 +00:00
parent 8da72f82be
commit c8b18df9a7
4 changed files with 87 additions and 119 deletions
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22
unittests/Support/EndianTest.cpp
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@ -21,36 +21,36 @@ namespace {
TEST(Endian, Read) {
// These are 5 bytes so we can be sure at least one of the reads is unaligned.
unsigned char big[] = {0x00, 0x01, 0x02, 0x03, 0x04};
unsigned char little[] = {0x00, 0x04, 0x03, 0x02, 0x01};
unsigned char bigval[] = {0x00, 0x01, 0x02, 0x03, 0x04};
unsigned char littleval[] = {0x00, 0x04, 0x03, 0x02, 0x01};
int32_t BigAsHost = 0x00010203;
EXPECT_EQ(BigAsHost, (endian::read_be<int32_t, unaligned>(big)));
EXPECT_EQ(BigAsHost, (endian::read<int32_t, big, unaligned>(bigval)));
int32_t LittleAsHost = 0x02030400;
EXPECT_EQ(LittleAsHost, (endian::read_le<int32_t, unaligned>(little)));
EXPECT_EQ(LittleAsHost,(endian::read<int32_t, little, unaligned>(littleval)));
EXPECT_EQ((endian::read_be<int32_t, unaligned>(big + 1)),
(endian::read_le<int32_t, unaligned>(little + 1)));
EXPECT_EQ((endian::read<int32_t, big, unaligned>(bigval + 1)),
(endian::read<int32_t, little, unaligned>(littleval + 1)));
}
TEST(Endian, Write) {
unsigned char data[5];
endian::write_be<int32_t, unaligned>(data, -1362446643);
endian::write<int32_t, big, unaligned>(data, -1362446643);
EXPECT_EQ(data[0], 0xAE);
EXPECT_EQ(data[1], 0xCA);
EXPECT_EQ(data[2], 0xB6);
EXPECT_EQ(data[3], 0xCD);
endian::write_be<int32_t, unaligned>(data + 1, -1362446643);
endian::write<int32_t, big, unaligned>(data + 1, -1362446643);
EXPECT_EQ(data[1], 0xAE);
EXPECT_EQ(data[2], 0xCA);
EXPECT_EQ(data[3], 0xB6);
EXPECT_EQ(data[4], 0xCD);
endian::write_le<int32_t, unaligned>(data, -1362446643);
endian::write<int32_t, little, unaligned>(data, -1362446643);
EXPECT_EQ(data[0], 0xCD);
EXPECT_EQ(data[1], 0xB6);
EXPECT_EQ(data[2], 0xCA);
EXPECT_EQ(data[3], 0xAE);
endian::write_le<int32_t, unaligned>(data + 1, -1362446643);
endian::write<int32_t, little, unaligned>(data + 1, -1362446643);
EXPECT_EQ(data[1], 0xCD);
EXPECT_EQ(data[2], 0xB6);
EXPECT_EQ(data[3], 0xCA);
@ -69,4 +69,4 @@ TEST(Endian, PackedEndianSpecificIntegral) {
EXPECT_EQ(*big_val, *little_val);
}
}
} // end anon namespace