introduced to work-around bug in the gcc-11.1 optimiser which is fixed in gcc-11.2 See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101634
introduced to work-around bug in the gcc-11.1 optimiser which is fixed in gcc-11.2 See https://gcc.gnu.org/bugzilla/show_bug.cgi?id=101634