Small toom43 cleanup

[bodrato at mail.dm.unipi.it]

Ciao,

> I don't understand what you mean by "unsigned" here.

I shouldn't write public messages during night-time :-) Read "positive" :-D

> Unsigned, if it is a standards conforming C compiler.

Perfect, thanks for the lesson! I'll change my code with (size_t).

Regards,
Marco

PS: Toom-8 + Toom8.5 are ready, some more testing is needed...

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