Mark Shannon added the comment:

Stefan,
I tried running your pi_bench (increasing the numer of iterations by x10 to 
reduce jitter). The run to run variation exceed the difference between the two 
versions. Here are the fastest of 7 runs on my machine.
i3-2370M CPU @ 2.40GHz × 4. linux 64bit. 

With patch:
1.154152s

Without patch:
1.157730s

I'm somewhat surprised by the slowdown on your machine. There should be no 
difference in the bytecodes executed or their implementation in the pi_float 
loop.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue17611>
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