Message 156372 - Python tracker

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In-reply-to
Author	vstinner
Recipients	benjamin.peterson, pitrou, skrah, vstinner
Date	2012年03月20日.00:30:49
SpamBayes Score	2.6889602e-12
Marked as misclassified	No
Message-id	<1332203451.22.0.724931415173.issue14249@psf.upfronthosting.co.za>

Content
Attached patch uses an union to make the compiler warning quiet. It should not speed up Python because the function already ensures that the pointer is aligned to the size of a long. It may slow down the function, I don't know gcc enough to guess exactly the impact on performances. An alternative is to use __attribute__((__may_alias__)), a GCC specific attribute. I don't know the impact on performances of this attribute.

Content

Attached patch uses an union to make the compiler warning quiet. It should not speed up Python because the function already ensures that the pointer is aligned to the size of a long. It may slow down the function, I don't know gcc enough to guess exactly the impact on performances.
An alternative is to use __attribute__((__may_alias__)), a GCC specific attribute. I don't know the impact on performances of this attribute.

History
Date	User	Action	Args
2012年03月20日 00:30:51	vstinner	set	recipients: + vstinner, pitrou, benjamin.peterson, skrah
2012年03月20日 00:30:51	vstinner	set	messageid: <1332203451.22.0.724931415173.issue14249@psf.upfronthosting.co.za>
2012年03月20日 00:30:50	vstinner	link	issue14249 messages
2012年03月20日 00:30:50	vstinner	create

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