i'm refreshing myself on mmx currently, but noticed the following
comment from arch/i386/lib/mmx.c's _mmx_memcpy:
"Checksums are not a win with MMX on any CPU tested so far for any MMX
firstly, to what domain of checksums does this comment apply? secondly,
why is it true? it seems the PADDW family of instructions could work
well here; is the slowdown a result of the kernel's need to muck with
fpu state (from what i can tell, mmx uses the fp registers)?
thanks so much for any help!
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