e1078396e5
>use p->hashfraction when doing non-time-critical calculations, rather than >using HASHFRACTION directly. in time-critical calculations, if HASHFRACTION >is a power of two, check that p->hashfraction == HASHFRACTION and if so do >the calculation with the compiled-in value so that the compiler can optimize >out (potentially) expensive divisions. if p->hashfraction != HASHFRACTION, >actually do the division. This has the result that on machines with slow >division, the division can be optimized out of the common case, but that >if HASHFRACTION changes from the compiled-in value (for whatever reason), >profiling will still work. Changes suggested by Chris Torek. |
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