1 // SPDX-License-Identifier: 0BSD
2 
3 ///////////////////////////////////////////////////////////////////////////////
4 //
5 /// \file       crc32_table.c
6 /// \brief      Precalculated CRC32 table with correct endianness
7 //
8 //  Author:     Lasse Collin
9 //
10 ///////////////////////////////////////////////////////////////////////////////
11 
12 #include "common.h"
13 
14 
15 // FIXME: Compared to crc_common.h this has to check for __x86_64__ too
16 // so that in 32-bit builds crc32_x86.S won't break due to a missing table.
17 #if defined(HAVE_USABLE_CLMUL) && ((defined(__x86_64__) && defined(__SSSE3__) \
18 			&& defined(__SSE4_1__) && defined(__PCLMUL__)) \
19 		|| (defined(__e2k__) && __iset__ >= 6))
20 #	define X86_CLMUL_NO_TABLE 1
21 #endif
22 
23 #if defined(HAVE_ARM64_CRC32) \
24 		&& !defined(WORDS_BIGENDIAN) \
25 		&& defined(__ARM_FEATURE_CRC32)
26 #	define ARM64_CRC32_NO_TABLE 1
27 #endif
28 
29 
30 #if !defined(HAVE_ENCODERS) && (defined(X86_CLMUL_NO_TABLE) \
31 		|| defined(ARM64_CRC32_NO_TABLE_))
32 // No table needed. Use a typedef to avoid an empty translation unit.
33 typedef void lzma_crc32_dummy;
34 
35 #else
36 // Having the declaration here silences clang -Wmissing-variable-declarations.
37 extern const uint32_t lzma_crc32_table[8][256];
38 
39 #       ifdef WORDS_BIGENDIAN
40 #       	include "crc32_table_be.h"
41 #       else
42 #       	include "crc32_table_le.h"
43 #       endif
44 #endif
45