2018-09-03 Richard Biener <rguenther@suse.de>
PR tree-optimization/87197
* tree-ssa-sccvn.c (vn_nary_build_or_lookup_1): Mark the new def
visited. CSE the VN_INFO hashtable lookup.
* gcc.dg/torture/pr87197.c: New testcase.
PR tree-optimization/87169
* tree-ssa-sccvn.c (do_rpo_vn): When marking loops for not
iterating make sure there's no extra backedges from irreducible
regions feeding the header. Mark the destination block
executable.
* gcc.dg/torture/pr87169.c: New testcase.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@264057 138bc75d-0d04-0410-961f-82ee72b054a4