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Re: [PATCH 1/3] sha512: make it work, undo percpu message schedule | |
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On Sat, Jan 14, 2012 at 1:46 PM, Eric Dumazet <eric.dumazet@xxxxxxxxx> wrote:
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> This is too risky, and we provided an alternate patch, not just for fun.
Did you see the second patch?
The one that got rid of the *stupid* 80-entry array?
I don't know why so many sha implementations do that idiotic full
array, when the circular one is much better.
In fact, the 16-entry circular array allows machines with lots of
registers to keep all the state in registers and the C implementation
can often be as good as hand-tuned assembly. At least that's true for
sha1, I'm not sure you can do the same with sha512.
But that actually *requires* that the 16-entry array be done on the
stack as an automatic array. Anything else, and the compiler won't be
able to do it.
Linus
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