Re: CVS commit: syssrc/sys/arch/powerpc/powerpc

[Jaromir Dolecek <jdolecek%netbsd.org@localhost>]

Chris Hopps wrote:
> The mask is efficient in time perhaps, but certainly not in space given all
> the error entries that just got added.
>
> Is the 1 compare vs. 1 mask really a big deal? Is this mask operation the
> only reason the tables need to be power of two big?

Yes. It saves couple instructions on every system call. Definitely
worth those maximum 256*sizeof(void *) of space. The tables have
to be really p-o-2 big, so that the result pointer is valid pointer
to valid syscall entry.

Jaromir
-- 
Jaromir Dolecek <jdolecek%NetBSD.org@localhost>            
http://www.NetBSD.org/
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