https://gcc.gnu.org/bugzilla/show_bug.cgi?id=71840
--- Comment #1 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
I think this started with
commit e1bba98001be7ab89d5734ae0fdfe3996b4281a7
Author: rguenth <rguenth@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Thu Jul 7 07:43:35 2016 +0000
2016-07-07 Richard Biener <rguent...@suse.de>
* tree-ssa-pre.c: Include alias.h.
(compute_avail): If we have multiple VN_REFERENCEs with the
same hashtable entry adjust that to make it a valid replacement
for all of them with respect to alignment and aliasing
when doing insertion.
* tree-ssa-sccvn.h (vn_reference_operands_for_lookup): Declare.
* tree-ssa-sccvn.c (vn_reference_operands_for_lookup): New function.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@238078
138bc75d-0d04-0410-961f-82ee72b054a4
(but doesn't look like a dup of PR71816).
