[rescue] SGI, MIPS, and IA-64
Joshua D Boyd
jdboyd at cs.millersville.edu
Fri Feb 15 17:26:05 CST 2002
On Fri, Feb 15, 2002 at 05:28:29PM -0500, Dave McGuire wrote:
>>I think the bundles are cool (a bundle has 3 41bit instructions in them, which
>>are guaranteed to execute simultaneously, to my understanding), plus for the
>>most part it looks like IA-64 can execute 2 bundles at once (meaning 6 parallel
> Wow, six whole instructions...one more than the (several year old)
> MIPS R10K. Isn't Intel wonderful?
Err, the R10k only has 5 execution units. I'm assuming that they operate
in parallel, but I can't seem to find any sources that say this explicitly.
I do see out of order execution on the R10k (I think that IA-64 chucked this,
but I'm being to lazy to look it up). I see speculative branching. IA-64
does that. At one time they were going to add hints to it so that you can
hint at which branch is more likely to make it a bit less speculative, but
again I'm being too lazy to look it up. They both are certainly complicated
chips though, one of the reasons why I still consider the 68030, 68040, r3k and
r4k to be my favorite chips, even if they aren't as fast.
Joshua D. Boyd
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