[Python-Dev] default of returning None hurts performance? (original) (raw)

Raymond Hettinger python at rcn.com
Tue Sep 1 00:39:47 CEST 2009

I was just wondering if a bytecode for a superinstruction of the common sequence:

6 POPTOP 7 LOADCONST 0 (None) 10 RETURNVALUE might be worth it.

[Collin Winter]

I doubt it. You'd save a bit of stack manipulation, but since this will only appear at the end of a function, I'd be skeptical that this would make any macrobenchmarks (statistically) significantly faster.

I concur with Collin. And since it appears only at the end of a function, the optimization doesn't help inner-loops in a function (where most of the time usually spent).

Raymond

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