That -OnegativeInfinity is a pun. With many compiler chains, -O0 (hyphen-oh-zero) does 'no' optimization, -O1 does a bit more, -O2 some more, -O3 even more. That 'no' is on quotes because there is no such thing as 'no optimization'. For example, given enough locals, a compiler must do register allocation.

The hypothetical -OnegativeInfinity would truly do no optimization.