https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92469
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- so this is only a regression as what was register 19 was removed and what was register 20 is now register 19. If we change "19" to "20" it still ICEs for older versions of GCC: apinski@xeond:~$ gcc t9.c t9.c: In function ‘foo’: t9.c:6:1: internal compiler error: in print_reg, at config/i386/i386.c:18026 } ^ Please submit a full bug report, with preprocessed source if appropriate. See <file:///usr/share/doc/gcc-7/README.Bugs> for instructions. related to PR 79804
