https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66183
--- Comment #1 from John David Anglin <danglin at gcc dot gnu.org> --- (gdb) p debug_rtx (x) (const:SI (plus:SI (label_ref:SI 29) (const_int -2 [0xfffffffffffffffe])))
https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66183
--- Comment #1 from John David Anglin <danglin at gcc dot gnu.org> --- (gdb) p debug_rtx (x) (const:SI (plus:SI (label_ref:SI 29) (const_int -2 [0xfffffffffffffffe])))