2011-12-08 Bill Schmidt <wschmidt@linux.vnet.ibm.com>
PR middle-end/39976
* tree-ssa-dom.c (enum expr_kind): Add EXPR_PHI.
(struct hashable_expr): Add struct phi field.
(initialize_hash_element): Handle phis; change to use XCNEWVEC.
(hashable_expr_equal_p): Handle phis.
(iterative_hash_hashable_expr): Likewise.
(print_expr_hash_elt): Likewise.
(free_expr_hash_elt): Likewise.
(dom_opt_enter_block): Create equivalences from redundant phis.
(eliminate_redundant_computations): Handle redundant phis.
(lookup_avail_expr): Handle phis.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@182140
138bc75d-0d04-0410-961f-
82ee72b054a4