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Kitware
GitHub Repository: Kitware/CMake
 Path: blob/master/Utilities/cmliblzma/liblzma/check/crc32_table.c
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// SPDX-License-Identifier: 0BSD

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///////////////////////////////////////////////////////////////////////////////

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//

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/// \file       crc32_table.c

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/// \brief      Precalculated CRC32 table with correct endianness

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//

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//  Author:     Lasse Collin

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//

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///////////////////////////////////////////////////////////////////////////////

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#include "common.h"

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// FIXME: Compared to crc_common.h this has to check for __x86_64__ too

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// so that in 32-bit builds crc32_x86.S won't break due to a missing table.

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#if defined(HAVE_USABLE_CLMUL) && ((defined(__x86_64__) && defined(__SSSE3__) \

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			&& defined(__SSE4_1__) && defined(__PCLMUL__)) \

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		|| (defined(__e2k__) && __iset__ >= 6))

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#	define NO_CRC32_TABLE

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#elif defined(HAVE_ARM64_CRC32) \

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		&& !defined(WORDS_BIGENDIAN) \

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		&& defined(__ARM_FEATURE_CRC32)

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#	define NO_CRC32_TABLE

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#endif

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#if !defined(HAVE_ENCODERS) && defined(NO_CRC32_TABLE)

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// No table needed. Use a typedef to avoid an empty translation unit.

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typedef void lzma_crc32_dummy;

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#else

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// Having the declaration here silences clang -Wmissing-variable-declarations.

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extern const uint32_t lzma_crc32_table[8][256];

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#	ifdef WORDS_BIGENDIAN

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#		include "crc32_table_be.h"

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#	else

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#		include "crc32_table_le.h"

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#	endif

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#endif

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