STINNER Victor added the comment:

> performance benefit is small.
> https://gist.github.com/methane/32fe57cd4aaac1c5c37f75cbbfbe7562

Are you using PGO+LTO compilation? Without PGO, the noise of code placement can 
be too high. In your "perf stat" comparisons, I see that "insn per cycle" is 
lower with the patch, which sounds like a code placement issue like a 
performance issue with the patch.

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<http://bugs.python.org/issue29507>
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