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Re: An unusual Performance approach using Synthetic registers
- From: dewar at gnat dot com (Robert Dewar)
- To: dewar at gnat dot com, lord at emf dot net
- Cc: denisc at overta dot ru, gcc at gcc dot gnu dot org, ja_walker at earthlink dot net
- Date: Sun, 5 Jan 2003 09:05:15 -0500 (EST)
- Subject: Re: An unusual Performance approach using Synthetic registers
> Bah. I missed that (misread while skimming, actually). Maybe his
> implementation approach is bogus after all. Why not use the FP, if
> it's there, or SP when FP is omitted.
>
well indeed FP makes more sense, and that's why the discussoin lead there
> But it can also improve both locality and the temporally proximate
> re-use of memory locations.
That's really not an issue for scalars. L1 caches are small but not that
small. once again, empirically most references to local stack frames are
in cache anyway, so there's really not much to improve here.
> ja_walker is right: it's a worthwhile emperical question
it's reasonable to ask the question, but the way to explore the answer is
to study some examples in detail. I think you will find it is very
difficult to provide even one semi-convincing example if you look at it
in detail.