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From: "rguenth at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org> To: gcc-bugs@gcc.gnu.org Subject: [Bug tree-optimization/53774] Reassociator generates non-canonical addition Date: Tue, 26 Jun 2012 14:24:00 -0000 [thread overview] Message-ID: <bug-53774-4-snqrJ6COZv@http.gcc.gnu.org/bugzilla/> (raw) In-Reply-To: <bug-53774-4@http.gcc.gnu.org/bugzilla/> http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53774 Richard Guenther <rguenth at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Keywords| |missed-optimization Status|NEW |ASSIGNED AssignedTo|unassigned at gcc dot |rguenth at gcc dot gnu.org |gnu.org | --- Comment #2 from Richard Guenther <rguenth at gcc dot gnu.org> 2012-06-26 14:24:13 UTC --- I am testing instead @@ -2299,8 +2299,16 @@ rewrite_expr_tree (gimple stmt, unsigned print_gimple_stmt (dump_file, stmt, 0, 0); } - gimple_assign_set_rhs1 (stmt, oe1->op); - gimple_assign_set_rhs2 (stmt, oe2->op); + if (tree_swap_operands_p (oe1->op, oe2->op, true)) + { + gimple_assign_set_rhs1 (stmt, oe2->op); + gimple_assign_set_rhs2 (stmt, oe1->op); + } + else + { + gimple_assign_set_rhs1 (stmt, oe1->op); + gimple_assign_set_rhs2 (stmt, oe2->op); + } update_stmt (stmt); if (rhs1 != oe1->op && rhs1 != oe2->op) remove_visited_stmt_chain (rhs1); which fixes it. OTOH there are many other places reassoc adjusts stmt operands (but it eventually relies on operand order). Adding a canonicalize_operand_order_and_update_stmt () wherever we call update_stmt afer adjusting operands might be better ... or simply calling fold_stmt on all stmts we touch which does the re-ordering, too. Well, I'm not really sure where we should enforce canonical ordering ...
next prev parent reply other threads:[~2012-06-26 14:24 UTC|newest] Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top 2012-06-25 22:21 [Bug tree-optimization/53774] New: " wschmidt at gcc dot gnu.org 2012-06-26 8:56 ` [Bug tree-optimization/53774] " rguenth at gcc dot gnu.org 2012-06-26 14:24 ` rguenth at gcc dot gnu.org [this message] 2012-06-26 18:42 ` wschmidt at gcc dot gnu.org 2012-06-26 18:52 ` wschmidt at gcc dot gnu.org 2012-06-27 8:28 ` rguenther at suse dot de 2012-06-27 11:29 ` rguenth at gcc dot gnu.org 2012-06-27 11:30 ` rguenth at gcc dot gnu.org 2012-06-27 11:30 ` rguenth at gcc dot gnu.org
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