[New-bugs-announce] [issue13136] speed-up conversion between unicode widths

[Antoine Pitrou]

New submission from Antoine Pitrou <pitrou at free.fr>:

This patch speeds up _PyUnicode_CONVERT_BYTES by unrolling its loop.

Example micro-benchmark:

./python -m timeit -s "a='x'*10000;b='\u0102'*1000;c='\U00100000'" "a+b+c"

-> before:
100000 loops, best of 3: 14.9 usec per loop
-> after:
100000 loops, best of 3: 9.19 usec per loop

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components: Interpreter Core
files: unroll_convert_bytes.patch
keywords: patch
messages: 145192
nosy: pitrou
priority: normal
severity: normal
stage: patch review
status: open
title: speed-up conversion between unicode widths
type: performance
versions: Python 3.3
Added file: http://bugs.python.org/file23351/unroll_convert_bytes.patch

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Python tracker <report at bugs.python.org>
<http://bugs.python.org/issue13136>
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