http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49419
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution| |FIXED
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-06-16
08:17:46 UTC ---
The bug should be fixed now, though VRP should be cerrtainly improved in
various ways, including choosing better vr during extract_range_from_assert,
trying to derive numeric ranges from symbolic ranges x - 1 maximums or x + 1
minimums,
and IMHO adjust_range_for_scev could use number_of_latch_executions to see if
the number is simple enough and a smaller iteration count can be derived from
its value ranges or, e.g. if it is the init SSA_NAME itself or that plus/minus
a constant, it could determine it doesn't decrease until -INF but only until 0
+- constant.
