I think the documentation for Sun's "javac" says
that "-O" is a NOP.
In theory (and in practice with some other compilers :-)
there's a fair degree of scope for optimizing intermediate
code. Not just dead code elimination, but reorganizing
basic blocks, eliminating temporaries, and so on. (The
Java bytecodes are in effect just another type of compiler
intermediate code representation. QED.)
- Dave
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