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From: "rearnsha at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug rtl-optimization/18401] [4.0.0 Regression] Bootstrap failure on all ARM targets due to incorrect GCSE Date: Wed, 05 Jan 2005 19:00:00 -0000 [thread overview] Message-ID: <20050105190019.18575.qmail@sourceware.org> (raw) In-Reply-To: <20041109150721.18401.rearnsha@gcc.gnu.org> ------- Additional Comments From rearnsha at gcc dot gnu dot org 2005-01-05 19:00 ------- It went away after this patch: 2004-11-10 Zdenek Dvorak <dvorakz@suse.cz> * tree-ssa-loop-ivopts.c (get_address_cost): Add address elements in right order. (force_var_cost): Determine cost of addition and multiplication more precisely. (get_computation_cost_at): Add cost for computing address elements to the final cost. * fold-const.c (fold): Attempt to use ptr_difference_const whenever one of the arguments of MINUS_EXPR is an address. (split_address_to_core_and_offset): New function. (ptr_difference_const): Handle case when one of the operands is a pointer. * tree-ssa-loop-ivopts.c (determine_base_object): Fold &*addr. (ptr_difference_cost): Pass addresses instead of objects to ptr_difference_const. So I suspect it might have gone latent again, but it might be that it was fixed by the canonicalization change to get_address_cost and that the problem can only occur with RTL that is not in correct canonical form. For reference here are the links to the two patch proposals: http://gcc.gnu.org/ml/gcc-patches/2004-11/msg00610.html http://gcc.gnu.org/ml/gcc-patches/2004-11/msg00715.html -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=18401
next prev parent reply other threads:[~2005-01-05 19:00 UTC|newest] Thread overview: 10+ messages / expand[flat|nested] mbox.gz Atom feed top 2004-11-09 15:08 [Bug bootstrap/18401] New: " rearnsha at gcc dot gnu dot org 2004-11-09 15:09 ` [Bug bootstrap/18401] " rearnsha at gcc dot gnu dot org 2004-11-09 15:10 ` pinskia at gcc dot gnu dot org 2004-11-09 15:47 ` rearnsha at gcc dot gnu dot org 2004-11-09 17:55 ` [Bug rtl-optimization/18401] " pinskia at gcc dot gnu dot org 2004-12-12 22:10 ` pinskia at gcc dot gnu dot org 2004-12-13 9:54 ` rearnsha at gcc dot gnu dot org 2004-12-22 13:03 ` steven at gcc dot gnu dot org 2005-01-05 19:00 ` rearnsha at gcc dot gnu dot org [this message] 2005-01-05 19:05 ` [Bug rtl-optimization/18401] " pinskia at gcc dot gnu dot org
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