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| author | Mark Adler <madler@alumni.caltech.edu> | 2018-12-11 01:11:38 -0800 |
|---|---|---|
| committer | Mark Adler <madler@alumni.caltech.edu> | 2018-12-26 12:26:52 -0800 |
| commit | f8719f5ae5acdc31d3794ddfea8ac963359de41e (patch) | |
| tree | 70327ff8a4953abd605665ecd458a3c4b1a66443 /zutil.h | |
| parent | 41d86c73b21191a3fa9ea5f476fc9f1fc5e4f8b3 (diff) | |
| download | zlib-f8719f5ae5acdc31d3794ddfea8ac963359de41e.tar.gz | |
Speed up software CRC-32 computation by a factor of 1.5 to 3.
Use the interleaved method of Kadatch and Jenkins in order to make
use of pipelined instructions through multiple ALUs in a single
core. This also speeds up and simplifies the combination of CRCs,
and updates the functions to pre-calculate and use an operator for
CRC combination.
Diffstat (limited to 'zutil.h')
| -rw-r--r-- | zutil.h | 11 |
1 files changed, 11 insertions, 0 deletions
@@ -42,6 +42,17 @@ typedef unsigned short ush; typedef ush FAR ushf; typedef unsigned long ulg; +#if !defined(Z_U8) && !defined(Z_SOLO) && defined(STDC) +# include <limits.h> +# if (ULONG_MAX == 0xffffffffffffffffULL) +# define Z_U8 unsigned long +# elif (ULLONG_MAX == 0xffffffffffffffffULL) +# define Z_U8 unsigned long long +# elif (UINT_MAX == 0xffffffffffffffffULL) +# define Z_U8 unsigned +# endif +#endif + extern z_const char * const z_errmsg[10]; /* indexed by 2-zlib_error */ /* (size given to avoid silly warnings with Visual C++) */ |