what optimizations are invalid in java?

[Tom Tromey]

>>>>> "Jan" == Jan Hubicka <jh@suse.cz> writes:

Jan> fold_const: We can remove dead parts of expresisons poossibly eliminating
Jan> trap.

Jan> Code not executed is unreachable, dead code is code executed but
Jan> with void results.  In fold const we can delete as dead for
Jan> instance (a/b)*0 that may trap in case b is 0.

Thanks.  In that case I think we can only remove dead code that is
known not to generate an exception.

Tom