Message 156372 - Python tracker

➜

This issue tracker has been migrated to GitHub, and is currently read-only.
For more information, see the GitHub FAQs in the Python's Developer Guide.

Author	vstinner
Recipients	benjamin.peterson, pitrou, skrah, vstinner
Date	2012-03-20.00:30:49
SpamBayes Score	2.6889602e-12
Marked as misclassified	No
Message-id	<1332203451.22.0.724931415173.issue14249@psf.upfronthosting.co.za>
In-reply-to

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.

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
2012-03-20 00:30:51	vstinner	set	recipients: + vstinner, pitrou, benjamin.peterson, skrah
2012-03-20 00:30:51	vstinner	set	messageid: <1332203451.22.0.724931415173.issue14249@psf.upfronthosting.co.za>
2012-03-20 00:30:50	vstinner	link	issue14249 messages
2012-03-20 00:30:50	vstinner	create