Message 146122 - Python tracker

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In-reply-to
Author	vstinner
Recipients	Oleg.Plakhotnyuk, vstinner
Date	2011年10月21日.19:53:18
SpamBayes Score	2.07044e-06
Marked as misclassified	No
Message-id	<1319226800.14.0.264732238507.issue13241@psf.upfronthosting.co.za>

Content
It is a compiler bug in GCC 4.2.1 with -O3. Try to compile attached unicode.c program with gcc -O3. The correct result is: $ gcc -O3 unicode.c -o unicode && ./unicode is ascii? 0 is compact? 1 is compact ascii? 0 _PyUnicode_COMPACT_DATA: 88 vs 88 PyUnicode_DATA: 88 vs 88 explicit cast: 88 vs 88 With gcc 4.2.1 and -O3, you get "is compact ascii? 1".

Content

It is a compiler bug in GCC 4.2.1 with -O3. Try to compile attached unicode.c program with gcc -O3. The correct result is:
$ gcc -O3 unicode.c -o unicode && ./unicode
is ascii? 0
is compact? 1
is compact ascii? 0
_PyUnicode_COMPACT_DATA: 88 vs 88
PyUnicode_DATA: 88 vs 88
explicit cast: 88 vs 88
With gcc 4.2.1 and -O3, you get "is compact ascii? 1".

History
Date	User	Action	Args
2011年10月21日 19:53:20	vstinner	set	recipients: + vstinner, Oleg.Plakhotnyuk
2011年10月21日 19:53:20	vstinner	set	messageid: <1319226800.14.0.264732238507.issue13241@psf.upfronthosting.co.za>
2011年10月21日 19:53:19	vstinner	link	issue13241 messages
2011年10月21日 19:53:19	vstinner	create

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