diff options
Diffstat (limited to 'neozip/crc32_braid_p.h')
| -rw-r--r-- | neozip/crc32_braid_p.h | 36 |
1 files changed, 36 insertions, 0 deletions
diff --git a/neozip/crc32_braid_p.h b/neozip/crc32_braid_p.h new file mode 100644 index 0000000000..624e22ecd9 --- /dev/null +++ b/neozip/crc32_braid_p.h @@ -0,0 +1,36 @@ +#ifndef CRC32_BRAID_P_H_ +#define CRC32_BRAID_P_H_ + +#include "zendian.h" + +/* Define BRAID_N, valid range is 1..6 */ +#define BRAID_N 5 + +/* Define BRAID_W and the associated z_word_t type. If BRAID_W is not defined, then a braided + calculation is not used, and the associated tables and code are not compiled. + + TODO: According to crc32_braid_c.c, BRAID_N=5, BRAID_W=4 is fastest with Sparc64-VII, + PowerPC POWER9, and MIPS64 Octeon II processors. + */ +#ifdef ARCH_64BIT +# define BRAID_W 8 + typedef uint64_t z_word_t; +# define Z_WORD_FROM_LE(word) Z_U64_FROM_LE(word) +#else +# define BRAID_W 4 + typedef uint32_t z_word_t; +# define Z_WORD_FROM_LE(word) Z_U32_FROM_LE(word) +#endif + +#if BYTE_ORDER == LITTLE_ENDIAN +# define BRAID_TABLE crc_braid_table +#elif BYTE_ORDER == BIG_ENDIAN +# define BRAID_TABLE crc_braid_big_table +#else +# error "No endian defined" +#endif + +/* CRC polynomial. */ +#define POLY 0xedb88320 /* p(x) reflected, with x^32 implied */ + +#endif /* CRC32_BRAID_P_H_ */ |