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PR tree-optimization/42906
authorhubicka <hubicka@138bc75d-0d04-0410-961f-82ee72b054a4>
Tue, 6 Apr 2010 15:18:18 +0000 (15:18 +0000)
committerhubicka <hubicka@138bc75d-0d04-0410-961f-82ee72b054a4>
Tue, 6 Apr 2010 15:18:18 +0000 (15:18 +0000)
* tree-ssa-dce.c (mark_control_dependent_edges_necessary): Add IGNORE_SELF
argument; set visited_control_parents for fully processed BBs.
(find_obviously_necessary_stmts): Update call of
mark_control_dependent_edges_necessary.
(propagate_necessity): Likewise; handle PHI edges more curefully.

* gcc.dg/tree-ssa/dce-1.c: New testcase.

git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@158004 138bc75d-0d04-0410-961f-82ee72b054a4


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