Re: Why are integer and FP registers separated?

Date: Mon, 14 Aug 1995 18:02:15 +0200


Michael Meissner <meissner@cygnus.com> wrote:
> You could use implied tags, where floats are put in one set of pages,
> cons are put in another set (I forget what the generic name for this
> is -- Bag of Bits is what is coming to mind).


You probably mean BIBOP ("BIg Bags Of Pages" or somesuch)




Stefan


PS: it's definitely a possibility, but it means you need a pointer to the
float. The main problem was to find a scheme that allows to deal with
immediate floats. BIBOP is actually a tagging scheme that tags some bits
of your pointer, just like using the lower 2 bits. I'm not saying it's a bad
scheme (all tagging scheme are highly dependent on the specific case) but it's
not a solution to the "current" problem.




Stefan
--

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