https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109780
--- Comment #36 from Uroš Bizjak <ubizjak at gmail dot com> --- (In reply to Uroš Bizjak from comment #35) > It is not a good idea to CSE address that refers to virtual stack vars to a > temporary. This defeats stack/frame pointer detection, mentioned in Comment > #33, and consequently fails to increase stack alignment. This is expanded via builtins.cc/expand_builtin_memset_args.