https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110313
--- Comment #8 from Tobias Burnus <burnus at gcc dot gnu.org> --- Adding this debug code : __builtin_fprintf (stderr, "DEBUG:>> %d - %d - %d\n", get_lra_reg_info_size () , max_reg_num (), ORIGINAL_REGNO (operand_reg[nop])); shows for the failing case: DEBUG: 664 - 446 - 835 Namely: the problem is that ORIGINAL_REGNO() > max_reg_num () and not that lra.cc's reg_info_size < max_reg_num ().