Hi, Jan Hubicka wrote: > > simplify_unary_operation is called with (code=NEG, mode=VOIDmode, > VOIDmode is wrong, it should be SImode. Who is calling it? > Can you add an sanity check to that function? See subject: validate_replace_rtx_1 :) It's the 'case MINUS:' part, op0_mode is VOIDmode. bye, Roman