[Bug middle-end/90648] [8/9/10 Regression] ICE tree check: accessed operand 4 of call_expr with 3 operands in generic_simplify_MULT_EXPR, at generic-match.c:27222

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90648

--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Another thing is that gimple_builtin_call_types_compatible_p compares the
argument types to the TYPE_ARG_TYPES of the fndecl, but that could very well be
the user provided prototype rather than what GCC relies on.
So perhaps the way forward is just do a better job on the C FE side too, if the
user provided decl is too different, make sure not to overwrite the old
anticipated builtin and don't mark the new decl as builtin.