https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121695
--- Comment #3 from Andrew Pinski <pinskia at gcc dot gnu.org> --- I see my typo: ``` gimple_phi_arg (phi, 0)->def = new_arg0; gimple_phi_arg (phi, 0)->def = new_arg1; ``` Should be: ``` gimple_phi_arg (phi, 0)->def = new_arg0; gimple_phi_arg (phi, 1)->def = new_arg1; ``` :)