[issue2268] Fold slice constants

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[issue2268] Fold slice constants

Changes by Georg Brandl ge...@python.org: -- versions: +Python 3.2 -Python 3.0 ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue2268 ___ ___

[issue2268] Fold slice constants

Changes by Guido van Rossum gu...@python.org: -- nosy: -gvanrossum ___ Python tracker rep...@bugs.python.org http://bugs.python.org/issue2268 ___ ___ Python-bugs-list

[issue2268] Fold slice constants

Raymond Hettinger rhettin...@users.sourceforge.net added the comment: The was a nice attempt at a peephole optimization. I'm rejecting it because: * too many other things need to be changed to support it * the measured win is somewhat small * we have a negative bias towards expanding the

[issue2268] Fold slice constants

Alexander Belopolsky [EMAIL PROTECTED] added the comment: Just to quantify the improvement: Before: $ ./python -m timeit -sx='abc' x[::-1] 100 loops, best of 3: 0.305 usec per loop $ ./python -O -m timeit -sx='abc' x[::-1] 100 loops, best of 3: 0.275 usec per loop After: $ ./python

[issue2268] Fold slice constants

New submission from Alexander Belopolsky [EMAIL PROTECTED]: I am attaching a proof-of-concept patch which would optimize bytecode generated from constant slices as follows: Before patch: dis(lambda:x[1:2:3]) 1 0 LOAD_GLOBAL 0 (x) 3 LOAD_CONST

[issue2268] Fold slice constants

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