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2b42509f8b
This fixes an issue with redundant store elimination in FRE/PRE which, when invoked by the DOM elimination walk, ends up using possibly stale availability data from the RPO walk. It also fixes a missed optimization during valueization of addresses by making sure to use get_addr_base_and_unit_offset_1 which can valueize and adjusting that to also valueize ARRAY_REFs low-bound. 2020-05-08 Richard Biener <rguenther@suse.de> * tree-ssa-sccvn.c (rpo_avail): Change type to eliminate_dom_walker *. (eliminate_with_rpo_vn): Adjust rpo_avail to make vn_valueize use the DOM walker availability. (vn_reference_fold_indirect): Use get_addr_base_and_unit_offset_1 with vn_valueize as valueization callback. (vn_reference_maybe_forwprop_address): Likewise. * tree-dfa.c (get_addr_base_and_unit_offset_1): Also valueize array_ref_low_bound. * gnat.dg/opt83.adb: New testcase.
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