diff options
Diffstat (limited to 'lzfP.h')
| -rw-r--r-- | lzfP.h | 37 |
1 files changed, 27 insertions, 10 deletions
@@ -39,7 +39,7 @@ #ifndef LZFP_h #define LZFP_h -#define STANDALONE /* at the moment, this is ok. */ +#define STANDALONE 1 /* at the moment, this is ok. */ #ifndef STANDALONE # include "lzf.h" @@ -49,29 +49,40 @@ * size of hashtable is (1 << HLOG) * sizeof (char *) * decompression is independent of the hash table size * the difference between 15 and 14 is very small - * for small blocks (and 14 is also faster). - * For a low-memory configuration, use HLOG == 13; - * For best compression, use 15 or 16. + * for small blocks (and 14 is usually a but faster). + * For a low-memory/faster configuration, use HLOG == 13; + * For best compression, use 15 or 16 (or more). */ #ifndef HLOG # define HLOG 14 #endif /* - * sacrifice some compression quality in favour of compression speed. + * sacrifice very little compression quality in favour of compression speed. + * This gives almost the same compression as the default code, and is + * (very roughly) 15% faster. This is the preferable mode of operation. + */ + +#ifndef VERY_FAST +# define VERY_FAST 1 +#endif + +/* + * sacrifice some more compression quality in favour of compression speed. * (roughly 1-2% worse compression for large blocks and * 9-10% for small, redundant, blocks and >>20% better speed in both cases) - * In short: enable this for binary data, disable this for text data. + * In short: when in need for speed, enable this for binary data, + * possibly disable this for text data. */ #ifndef ULTRA_FAST -# define ULTRA_FAST 1 +# define ULTRA_FAST 0 #endif /* * unconditionally aligning does not cost very much, so do it if unsure */ #ifndef STRICT_ALIGN -# define STRICT_ALIGN !defined(__i386) +# define STRICT_ALIGN !(defined(__i386) || defined (__amd64)) #endif /* @@ -83,8 +94,8 @@ #endif /* - * you may choose to pre-set the hash table (might be faster on modern cpus - * and large (>>64k) blocks) + * you may choose to pre-set the hash table (might be faster on some + * modern cpus and large (>>64k) blocks) */ #ifndef INIT_HTAB # define INIT_HTAB 0 @@ -128,6 +139,12 @@ typedef const u8 *LZF_STATE[1 << (HLOG)]; # endif #endif +#if ULTRA_FAST +# if defined(VERY_FAST) +# undef VERY_FAST +# endif +#endif + #if USE_MEMCPY || INIT_HTAB # ifdef __cplusplus # include <cstring> |