[Patches] [ python-Patches-416953 ] Speed up ASCII decoding

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Patches item #416953, was updated on 2001-04-17 22:37
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Category: core (C code)
Group: None
>Status: Closed
>Resolution: Accepted
Priority: 5
Submitted By: Martin v. Löwis (loewis)
>Assigned to: Nobody/Anonymous (nobody)
Summary: Speed up ASCII decoding

Initial Comment:
In code that supports both byte and unicode strings,
mixing unicode strings with plain character constants
is frequent. E.g. both sre_compile and xmlproc look for
specific characters in an input string. Every usage of
such a character requires default decoding, which will
create a temporary Unicode object.

This patch caches Unicode objects that represent ASCII
characters. On the benchmark

import time
u = u""
t=time.time()
for i in xrange(1000000):
    u+"("
print time.time()-t

it shows a 10% speed-up.

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>Comment By: Martin v. Löwis (loewis)
Date: 2001-04-18 05:51

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Committed as 2.83 of unicodeobject.c, with the requested
addition of init/fini code.

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Comment By: M.-A. Lemburg (lemburg)
Date: 2001-04-18 01:54

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I knew this would come one day :-) 

The patch looks OK, but please also add proper init and
finalize code so that unicode_ascii[] gets cleared up
properly when the interpreter shuts down (this is important
for uses of Python in e.g. mod_snake).

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Comment By: Martin v. Löwis (loewis)
Date: 2001-04-17 23:04

Message:
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Attach patch.

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