This is the mail archive of the
gcc-bugs@gcc.gnu.org
mailing list for the GCC project.
[Bug tree-optimization/34244] [4.3 Regression] VRP/SCEV miscompiles Firefox
- From: "rakdver at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 27 Nov 2007 16:48:34 -0000
- Subject: [Bug tree-optimization/34244] [4.3 Regression] VRP/SCEV miscompiles Firefox
- References: <bug-34244-10053@http.gcc.gnu.org/bugzilla/>
- Reply-to: gcc-bugzilla at gcc dot gnu dot org
------- Comment #4 from rakdver at gcc dot gnu dot org 2007-11-27 16:48 -------
> as it may be zero, in case offset_46 is <= 0.
>
> Sebastian, Zdenek - any idea what goes wrong here?
# of iteration analysis records an assumption that offset_46 >= 0. However,
this is simplified to true, as the value range of offset_46 is set to [0,0] by
vrp (which seems to be wrong); so the problem is probably somewhere else in
vrp.
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34244