On Feb 8, 2008, at 12:43 PM, Ivan Voras wrote:
Historically, the Python optimizer wasn't capable of doing much,
true, but the more recent versions of the optimizer can actually do
some peephole optimizations like algorithmic simplification and
constant folding:
http://docs.python.org/whatsnew/other-lang.html#SECTION0001320000000000000000
A quick test with the built-in pystone mini-benchmark (taken out of
the standard library so the optimization can be varied) yields [*]:
python without -O : 5802.36
python with -O : 5781.39
That's ~ 0.4% difference, or low enough to be lost in the noise, agreed.
I suspect that if the Python optimizer becomes smart enough to do dead-
code elimination and code motion of invariants outside of loops that
one would see a more significant difference. At the present, it's
only smart enough to optimize pretty dumb cases that most humans would
already deal with...
--
-Chuck
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