Re: Mersenne: Thoughts on Merced / IA-64

[Anonymous]

> >- 82bit FPU (??)
>
> 82 bits?  It is time to go to 128 bits!

*If* the IA64 has a fast pipelineable 64 bit * 64 bit -> 128 bit integer
multiply capability, perhaps the FPU is no longer needed?  I guess I'd
better dig into that Architecture document a bit more.  Ah, sigh.  It has
64*64 but it only generates a single 64 bit high *or* low result in one
instruction, you get to chose which.  There's also Fixed-Point Multiply and
Add.

Hmm.  I wonder if two fixed point multiplies can be done in the same
instruction cycle?  Yeee-hah.

-jrp


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