[issue2459] speedup loops with better bytecode

[Antoine Pitrou]

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

This new patch should be ok. The block ordering algorithm in
compiler.pyassem looks entirely clean now, to the extent that the
previous "fixup" hacks have been disabled.

Attaching loops3.py.

Added file: http://bugs.python.org/file9829/loops3.patch

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