https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102505
--- Comment #9 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-10 branch has been updated by Martin Jambor <jamb...@gcc.gnu.org>: https://gcc.gnu.org/g:7d398e42d3d4ded84cb7a86396c75c5aaf518283 commit r10-10249-g7d398e42d3d4ded84cb7a86396c75c5aaf518283 Author: Martin Jambor <mjam...@suse.cz> Date: Tue Nov 2 11:17:51 2021 +0100 sra: Fix corner case of total scalarization with virtual inheritance (PR 102505) PR 102505 is a situation where of SRA takes its initial top-level access size from a get_ref_base_and_extent called on a COMPONENT_REF, and thus derived frm the FIELD_DECL, which however does not include a virtual base. Total scalarization then goes on traversing the type, which however has virtual base past the non-virtual bits, tricking SRA to create sub-accesses outside of the supposedly encompassing accesses, which in turn triggers the verifier within the pass. The patch below fixes that by failing total scalarization when this situation is detected. This backport also has commit f217e87972a2a207e793101fc05cfc9dd095c678 squashed into it in order to avoid PR 102886 that the fix introduced on trunk. gcc/ChangeLog: 2021-10-20 Martin Jambor <mjam...@suse.cz> PR tree-optimization/102505 * tree-sra.c (totally_scalarize_subtree): Check that the encountered field fits within the acces we would like to put it in. gcc/testsuite/ChangeLog: 2021-10-20 Martin Jambor <mjam...@suse.cz> PR tree-optimization/102505 * g++.dg/torture/pr102505.C: New test. (cherry picked from commit 701ee067807b80957c65bd7ff94b6099a27181de)
