https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118476
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- <source>: In function 'vext_p64': <source>:10:1: error: invalid 'PHI' argument 10 | } | ^ a _11 = PHI <a(3), b_7(D)(4)> during GIMPLE pass: phiopt <source>:10:1: internal compiler error: verify_gimple failed Let me look into this.