[libcxx] r275114 - Don't compute modulus of hash if it is smaller than the bucket count.

Duncan P. N. Exon Smith via cfe-commits cfe-commits at lists.llvm.org
Mon Jul 18 14:57:08 PDT 2016

> On 2016-Jul-17, at 14:09, Eric Fiselier <eric at efcs.ca> wrote:
> What I'm curious about if this performance regression was cause by (1) the removal of this 2 week old optimization or (2) the implementation of "fast mod". I suspect it's because of (1).

BTW, definitely from the 2 week old optimization.  I finally figured out how to look at a larger graph; if you zoom in it makes it pretty clear:

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