Serhiy Storchaka added the comment:
In response to Alexandre's comment on Rietveld. Access to a local variable is
faster than to a global one and the current implementation uses this for
struct.pack. I just use same trick for struct.unpack. Here is a microbenchmark
which demonstrate some effect of this optimization. I got 0.6491418619989417,
0.6947214259998873, and 0.5394902769985492 for optimized, non-optimized and
advanced optimized functions.
Of course, we can achieve even better effect if we will cache not only
struct.pack, but struct.Struct('<i').pack, struct.Struct('B').pack, etc. I were
considered this as a reason for other patch, but we can do it in this issue.
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Added file: http://bugs.python.org/file29715/bench.py
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