Re: [PATCH] Improve DOM's optimization of control statements
* tree-ssa-dom.c (optimize_stmt): Don't set LOOPS_NEED_FIXUP here. * tree-ssa-threadupdate.c (remove_ctrl_stmt_and_useless_edges): Do it here instead. Tighten test to avoid setting LOOPS_NEED_FIXUP unnecessarily. @@ -1848,12 +1848,6 @@ optimize_stmt (basic_block bb, gimple_stmt_iterator si, From-SVN: r228585
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2015-10-07 Jeff Law <law@redhat.com>
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* tree-ssa-dom.c (optimize_stmt): Don't set LOOPS_NEED_FIXUP here.
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* tree-ssa-threadupdate.c (remove_ctrl_stmt_and_useless_edges): Do it
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here instead. Tighten test to avoid setting LOOPS_NEED_FIXUP
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unnecessarily.
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@@ -1848,12 +1848,6 @@ optimize_stmt (basic_block bb, gimple_stmt_iterator si,
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2015-10-07 Aditya Kumar <aditya.k7@samsung.com>
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Sebastian Pop <s.pop@samsung.com>
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@ -1848,12 +1848,6 @@ optimize_stmt (basic_block bb, gimple_stmt_iterator si,
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FOR_EACH_EDGE (e, ei, bb->succs)
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remove_jump_threads_including (e);
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/* If BB is in a loop, then removing an outgoing edge from BB
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may cause BB to move outside the loop, changes in the
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loop exit edges, etc. So note that loops need fixing. */
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if (bb_loop_depth (bb) > 0)
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loops_state_set (LOOPS_NEED_FIXUP);
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/* Now clean up the control statement at the end of
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BB and remove unexecutable edges. */
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remove_ctrl_stmt_and_useless_edges (bb, taken_edge->dest);
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@ -300,6 +300,17 @@ remove_ctrl_stmt_and_useless_edges (basic_block bb, basic_block dest_bb)
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else
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ei_next (&ei);
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}
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/* If the remaining edge is a loop exit, there must have
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a removed edge that was not a loop exit.
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In that case BB and possibly other blocks were previously
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in the loop, but are now outside the loop. Thus, we need
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to update the loop structures. */
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if (single_succ_p (bb)
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&& loop_outer (bb->loop_father)
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&& loop_exit_edge_p (bb->loop_father, single_succ_edge (bb)))
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loops_state_set (LOOPS_NEED_FIXUP);
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}
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/* Create a duplicate of BB. Record the duplicate block in an array
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