https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84211
--- Comment #2 from GCC Commits <cvs-commit at gcc dot gnu.org> --- The master branch has been updated by Georg-Johann Lay <g...@gcc.gnu.org>: https://gcc.gnu.org/g:a4842917dcb8e6524ddf2574e5a0dc869fda1885 commit r15-5460-ga4842917dcb8e6524ddf2574e5a0dc869fda1885 Author: Georg-Johann Lay <a...@gjlay.de> Date: Tue Nov 19 14:53:10 2024 +0100 AVR: ad target/84211 - Fix a build failure on some hosts. This fixes a build failure on hosts where HARD_REG_SET is not a scalar. The issue was introduced with the patch for PR84211 in r15-5415. PR target/84211 gcc/ * config/avr/avr-passes.cc (memento_t::apply_insn1): Don't use operator &= on memento_t.known but on memento_t itself.