src/liblzma/check/crc64_table.c

   1 // SPDX-License-Identifier: 0BSD
   2
   3 ///////////////////////////////////////////////////////////////////////////////
   4 //
   5 /// \file       crc64_table.c
   6 /// \brief      Precalculated CRC64 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 crc64_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 NO_CRC64_TABLE
  21 #endif
  22
  23
  24 #ifdef NO_CRC64_TABLE
  25 // No table needed. Use a typedef to avoid an empty translation unit.
  26 typedef void lzma_crc64_dummy;
  27
  28 #else
  29 // Having the declaration here silences clang -Wmissing-variable-declarations.
  30 extern const uint64_t lzma_crc64_table[4][256];
  31
  32 #       if defined(WORDS_BIGENDIAN)
  33 #               include "crc64_table_be.h"
  34 #       else
  35 #               include "crc64_table_le.h"
  36 #       endif
  37 #endif