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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
This commit is contained in:
Jeff Law 2015-10-07 15:56:18 -06:00 committed by Jeff Law
parent b0b5710cf6
commit d44bd40ef0
3 changed files with 19 additions and 6 deletions
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8
gcc/ChangeLog
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@ -1,3 +1,11 @@
2015-10-07 Jeff Law <law@redhat.com>
* 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,
2015-10-07 Aditya Kumar <aditya.k7@samsung.com>
Sebastian Pop <s.pop@samsung.com>

6
gcc/tree-ssa-dom.c
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@ -1848,12 +1848,6 @@ optimize_stmt (basic_block bb, gimple_stmt_iterator si,
FOR_EACH_EDGE (e, ei, bb->succs)
remove_jump_threads_including (e);
/* If BB is in a loop, then removing an outgoing edge from BB
may cause BB to move outside the loop, changes in the
loop exit edges, etc. So note that loops need fixing. */
if (bb_loop_depth (bb) > 0)
loops_state_set (LOOPS_NEED_FIXUP);
/* Now clean up the control statement at the end of
BB and remove unexecutable edges. */
remove_ctrl_stmt_and_useless_edges (bb, taken_edge->dest);

11
gcc/tree-ssa-threadupdate.c
View File

@ -300,6 +300,17 @@ remove_ctrl_stmt_and_useless_edges (basic_block bb, basic_block dest_bb)
else
ei_next (&ei);
}
/* If the remaining edge is a loop exit, there must have
a removed edge that was not a loop exit.
In that case BB and possibly other blocks were previously
in the loop, but are now outside the loop. Thus, we need
to update the loop structures. */
if (single_succ_p (bb)
&& loop_outer (bb->loop_father)
&& loop_exit_edge_p (bb->loop_father, single_succ_edge (bb)))
loops_state_set (LOOPS_NEED_FIXUP);
}
/* Create a duplicate of BB. Record the duplicate block in an array