[Patches] [ python-Patches-721425 ] Enhanced bytecode optimizer

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Patches item #721425, was opened at 2003-04-14 16:29
Message generated for change (Comment added) made by rhettinger
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Category: Core (C code)
Group: Python 2.3
>Status: Pending
>Resolution: Later
Priority: 5
Submitted By: Raymond Hettinger (rhettinger)
>Assigned to: Raymond Hettinger (rhettinger)
Summary: Enhanced bytecode optimizer

Initial Comment:
Enhanced the bytecode optimizer to mark basic 
blocks, apply more transformations, and to fix-up 
jump targets when the code size gets shorter.

Old transformations no longer require filler codes.
New transformations:

RETURN_VALUE LOAD_CONST x RETURN_VALUE  --
>  RETURN_VALUE

BUILD_SEQN 3 UNPACK_SEQN 3  -->  ROT3 ROT2

not x in y --> x not in y
not x not in y --> x in y
not x is y --> x is not y
not x is not y --> x is y

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>Comment By: Raymond Hettinger (rhettinger)
Date: 2003-04-14 19:18

Message:
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Hmm, I'm going to take this one off the table for while.  
Right now, it gives too little extra benefit for all the 
additional code.  Also, it looks like removing a bytes 
means that the line numbering logic needs to be adjusted.

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