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[Bug middle-end/23518] some gcc optimizations do not take overflow into account with -fwrapv
- From: "pinskia at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 22 Aug 2005 19:45:53 -0000
- Subject: [Bug middle-end/23518] some gcc optimizations do not take overflow into account with -fwrapv
- References: <20050822193430.23518.pterjan@gmail.com>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Additional Comments From pinskia at gcc dot gnu dot org 2005-08-22 19:45 -------
Note signed overflow is undefined unless you use -fwrapv except that does not fix this.
This is a bug in fold, most likely build_range_check.
--
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Component|rtl-optimization |middle-end
Ever Confirmed| |1
Keywords| |wrong-code
Known to fail| |3.4.0 4.0.0 4.1.0
Last reconfirmed|0000-00-00 00:00:00 |2005-08-22 19:45:50
date| |
Summary|some gcc optimizations do |some gcc optimizations do
|not take overflow into |not take overflow into
|account |account with -fwrapv
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=23518