https://gcc.gnu.org/bugzilla/show_bug.cgi?id=69776
--- Comment #13 from Richard Biener <rguenth at gcc dot gnu.org> --- Author: rguenth Date: Thu Feb 25 09:07:08 2016 New Revision: 233693 URL: https://gcc.gnu.org/viewcvs?rev=233693&root=gcc&view=rev Log: 2016-02-25 Richard Biener <rguent...@suse.de> Backport from mainline 2016-02-15 Richard Biener <rguent...@suse.de> PR tree-optimization/69776 * tree-ssa-sccvn.h (vn_reference_lookup): Adjust prototype. * tree-ssa-sccvn.c (vn_reference_lookup): Add parameter to indicate whether we can use TBAA to disambiguate against stores. Use alias-set zero if not. (visit_reference_op_store): Do not use TBAA when looking up redundant stores. * tree-ssa-pre.c (compute_avail): Use TBAA here. (eliminate_dom_walker::before_dom_children): But not when looking up redundant stores. * gcc.dg/torture/pr69776.c: New testcase. 2016-02-16 Richard Biener <rguent...@suse.de> PR tree-optimization/69776 * tree-ssa-alias.c (indirect_ref_may_alias_decl_p): Get alias sets from caller. (indirect_refs_may_alias_p): Likewise. (refs_may_alias_p_1): Pass alias sets as from ao_ref. * tree-ssa-sccvn.c (vn_reference_lookup): Also adjust vr alias-set according to tbaa_p. * tree-ssa-dom.c (lookup_avail_expr): Add tbaa_p flag. (optimize_stmt): For redundant store discovery do not allow tbaa. * gcc.dg/torture/pr69776-2.c: New testcase. Added: branches/gcc-5-branch/gcc/testsuite/gcc.dg/torture/pr69776-2.c branches/gcc-5-branch/gcc/testsuite/gcc.dg/torture/pr69776.c Modified: branches/gcc-5-branch/gcc/ChangeLog branches/gcc-5-branch/gcc/testsuite/ChangeLog branches/gcc-5-branch/gcc/tree-ssa-alias.c branches/gcc-5-branch/gcc/tree-ssa-dom.c branches/gcc-5-branch/gcc/tree-ssa-pre.c branches/gcc-5-branch/gcc/tree-ssa-sccvn.c branches/gcc-5-branch/gcc/tree-ssa-sccvn.h
