[Python-Dev] String hash function multiplier
jepler at unpythonic.net
Tue Apr 13 21:09:54 EDT 2004
With -O2 -mcpu=i686 or newer, gcc uses "imul" for both 100003 and 65599,
rather than shifts and adds.
There may be a few people who care about some other processor, but I
wouldn't listen to them. (the only non-x86 CPU I program for on a weekly
basis doesn't have hardware multiply, but it's also much too small for
The current value goes back a long way:
... all the way back to when Python did string haching instead of
Other than some abstract beauty to 65599, are there some other practical
advantages I'm missing?
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