[issue4896] Faster why variable manipulation in ceval.c

[Antoine Pitrou]

Antoine Pitrou <pitrou at free.fr> added the comment:

I get a 3% speedup on x86-64 with gcc 4.3.2.
The label "why_not_here" should be renamed to something more meaningful
IMO. Or you could just kill the label and use "continue" instead.

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nosy: +pitrou

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<http://bugs.python.org/issue4896>
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