|Machine code parsers (entropy of machine code) firstname.lastname@example.org (Andrey I. Savov) (1996-11-24)|
|Re: Machine code parsers (entropy of machine code) email@example.com (1996-11-26)|
|Re: Machine code parsers (entropy of machine code) firstname.lastname@example.org (Andrey I. Savov) (1996-12-01)|
|Re: Machine code parsers (entropy of machine code) email@example.com (1996-12-03)|
|Re: Machine code parsers (entropy of machine code) firstname.lastname@example.org (1996-12-07)|
|From:||"Andrey I. Savov" <email@example.com>|
|Date:||1 Dec 1996 22:59:31 -0500|
Derek M Jones <firstname.lastname@example.org> wrote
> I think that perhaps we can talk about the entropy of instruction
> sets. But the code egnerated by different compilers?
Actually, the entropy of the instruction sets for Intel/PowerPC was
one of the initial questions. The set of compilers can be fixed saying
that we take only Microsoft compilers into consideration. I don't
believe this matters a lot, though.
> I once did a little experiment. I measured how well gzip compressed
> executable programs for a vareity of machines. There did seem to
> be some correlation between compression ratios for the same programs,
> compiled for different cpu's.
Well, you see, the gzip compression of executable code cannot give you
a good idea about the entropy of the machine code, because gzip
compresses everything as raw data.
As for different CPUs I'd expect RISC code to have smallest entropy
> Do you think optmised code will have a higher or lower entropy?
It's hard to say, I'd expect higher than non-optimized, because
usually some redundancies are removed during the optimization.
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