https://gcc.gnu.org/bugzilla/show_bug.cgi?id=93246
--- Comment #13 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Richard Guenther <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:6b8df3e421b56bb7853a158b889f5e45611fd31f commit r10-5940-g6b8df3e421b56bb7853a158b889f5e45611fd31f Author: Richard Biener <rguent...@suse.de> Date: Tue Jan 14 08:43:32 2020 +0100 PR middle-end/93246 - missing alias subsets Starting with the introduction of TYPE_TYPELESS_STORAGE the situation of having a alias-set zero aggregate field became more common which prevents recording alias-sets of fields of said aggregate as subset of the outer aggregate. component_uses_parent_alias_set_from in the past fended off some of the issues with that but the alias oracles use of the alias set of the base of an access path never appropriately handled it. The following makes it so that alias-sets of fields of alias-set zero aggregate fields are still recorded as subset of the container. 2020-01-14 Richard Biener <rguent...@suse.de> PR middle-end/93246 * alias.c (record_component_aliases): Take superset to record into, recurse for alias-set zero fields. (record_component_aliases): New oveerload wrapping around the above. * g++.dg/torture/pr93246.C: New testcase.
