Message 174205 - Python tracker

Message174205

Author	christian.heimes
Recipients	ajaksu2, christian.heimes, ezio.melotti, petri.lehtinen, pitrou, r.david.murray, serhiy.storchaka, tzimmo
Date	2012-10-30.12:58:47
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1351601927.5.0.460976073556.issue2005@psf.upfronthosting.co.za>
In-reply-to

Content
AFAIK C89 doesn't specify integer overflows: If an exceptional condition occurs during the evaluation of an expression (that is, if the result is not mathematically defined or not in the range of representable values for its type), the behavior is undefined. With GCC and -fwrapv integer overflow work as you have expected. But other (and mostly older) compilers can fail.

Content

AFAIK C89 doesn't specify integer overflows:

If an exceptional condition occurs during the evaluation of an expression (that is, if the result is not mathematically defined or not in the range of representable values for its type), the behavior is undefined.

With GCC and -fwrapv integer overflow work as you have expected. But other (and mostly older) compilers can fail.

History
Date	User	Action	Args
2012-10-30 12:58:47	christian.heimes	set	recipients: + christian.heimes, pitrou, ajaksu2, ezio.melotti, r.david.murray, petri.lehtinen, serhiy.storchaka, tzimmo
2012-10-30 12:58:47	christian.heimes	set	messageid: <1351601927.5.0.460976073556.issue2005@psf.upfronthosting.co.za>
2012-10-30 12:58:47	christian.heimes	link	issue2005 messages
2012-10-30 12:58:47	christian.heimes	create