https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61577
--- Comment #273 from John Buddery <jvb at cyberscience dot com> --- If you go back a bit further, is there a speculative load of one of those registers (probably r47 / r59 ) ? A speculative load will have a .s I think. I believe ILL_REGNAT should actually be a SEGV, not SIGILL - not sure why that's the signal being generated.
