[Patches] [ python-Patches-910929 ] Optimize list comprehensions

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Patches item #910929, was opened at 2004-03-06 08:22
Message generated for change (Comment added) made by rhettinger
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Category: Core (C code)
Group: Python 2.4
Status: Open
Resolution: None
Priority: 5
Submitted By: Raymond Hettinger (rhettinger)
Assigned to: Nobody/Anonymous (nobody)
Summary: Optimize list comprehensions

Initial Comment:
Save about 35% on the per pass overhead of list
comprehensions.

Adds a new opcode, LIST_APPEND, which is faster than
the current call to CALL_FUNCTION 1 on the bound
method, list.append(), and the subsequent call to
POP_TOP to clear the returned None value.

The resulting disassembled code is suprisingly light
and concise.

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>Comment By: Raymond Hettinger (rhettinger)
Date: 2004-03-07 02:41

Message:
Logged In: YES 
user_id=80475

Applied to:

Python/ceval.c 2.379
Python/compile.c 2.299
Include/opcode.h 2.44
Lib/opcode.py 1.5


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