https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120358
--- Comment #39 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-15 branch has been updated by Richard Biener <rgue...@gcc.gnu.org>: https://gcc.gnu.org/g:0f1e4dd1f9354ea962113e066152d0a77209f732 commit r15-9944-g0f1e4dd1f9354ea962113e066152d0a77209f732 Author: Richard Biener <rguent...@suse.de> Date: Mon Jul 7 15:13:38 2025 +0200 tree-optimization/120358 - bogus PTA with structure access When we compute the constraint for something like MEM[(const struct QStringView &)&tok2 + 32] we go and compute what (const struct QStringView &)&tok2 + 32 points to and then add subvariables to its dereference that possibly fall in the range of the access according to the original refs size. In doing that we disregarded that the subvariable the starting address points to might not be aligned to it and thus the access might start at any point within that variable. The following conservatively adjusts the pruning of adjacent sub-variables to honor this. PR tree-optimization/120358 * tree-ssa-structalias.cc (get_constraint_for_1): Adjust pruning of sub-variables according to the imprecise known start offset. (cherry picked from commit aa5ae523e84a97bf3a582ea0fa73d959afa9b9c7)
