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[Bug tree-optimization/34244] [4.3 Regression] VRP/SCEV miscompiles Firefox
- From: "rguenth at gcc dot gnu dot org" <gcc-bugzilla at gcc dot gnu dot org>
- To: gcc-bugs at gcc dot gnu dot org
- Date: 28 Nov 2007 15:47:02 -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 #6 from rguenth at gcc dot gnu dot org 2007-11-28 15:47 -------
We could clear the SCEV cache for an SSA_NAME we set a new value range
(in set_value_range and set_value_range_to_varying), but I
see that SCEV also caches loop->nb_iterations which we probably would need to
clear unconditionally (for all loops).
--
http://gcc.gnu.org/bugzilla/show_bug.cgi?id=34244