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Consolidate the occurrances of the prime used as the multiplier when hashing

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to a single #define instead of having several copies in several files.

This excludes the Modules/ tree (datetime and expat both have a copy
for their own purposes with no need for it to be the same).
This commit is contained in:
Gregory P. Smith 2012-01-14 15:31:34 -08:00
parent 515687a7ed
commit 63e6c3222f
4 changed files with 7 additions and 4 deletions
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5
Include/pyport.h
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@ -131,6 +131,9 @@ Used in: PY_LONG_LONG
#endif
#endif
/* Prime multiplier used in string and various other hashes. */
#define _PyHASH_MULTIPLIER 1000003 /* 0xf4243 */
/* Parameters used for the numeric hash implementation. See notes for
_PyHash_Double in Objects/object.c. Numeric hashes are based on
reduction modulo the prime 2**_PyHASH_BITS - 1. */
@ -143,7 +146,7 @@ Used in: PY_LONG_LONG
#define _PyHASH_MODULUS (((size_t)1 << _PyHASH_BITS) - 1)
#define _PyHASH_INF 314159
#define _PyHASH_NAN 0
#define _PyHASH_IMAG 1000003UL
#define _PyHASH_IMAG _PyHASH_MULTIPLIER
/* uintptr_t is the C9X name for an unsigned integral type such that a
* legitimate void* can be cast to uintptr_t and then back to void* again