Re: wondering what sized elements to use in arrays...

On Wed, 27 Jul 2005 11:34:29 GMT,
stephenXXX@xxxxxxxxxxxxxxxxxxxxxxxxxx (Stephen Pelc) wrote:

>I suggest you try it doing something like:
> @ 1+ drop
>This will force code generation without introducing the block boundary
>condition - the stack shuffle may be the real cause. Also try the
>+IDATA compilation switch.

What I might do is sit down this weekend perhaps and see if I can
finish that darn program this weekend (yeah, right..) And then see
what you guys think.

>I can't remember the reason for the change, but the faster is likely
>to be the one left in! Instruction selection for a P4 is non-obvious,
^^^^^^^^^^^
I am assuming that faster is the case! Yes, I seem to be discovering
all the time things that appear obvious are sometimes are not.

Heck, I didn't even know about the NOP 'paragraph' padding till I saw
your latest code, but it seems that makes a big difference to
branches.... That's why it's there isn't it?

It does make the machine code bulkier (and I have to say aesthetically
uglier) but it does run faster.

>and the differences between AMD and Intel CPUs are occasionally
>significant. At present we have P4s on the development boxes, but
>the next one will be AMD. For some reason, our local box supplier
>is currently only shipping Intel.

You mean like Dell? <grin>

And Intel's apparent leanings towards Pentium M may make that
something to look at as well, although I suspect they may not be all
that different to writing for PIII's.

Well, won't waste more time on usenet for now, got to go fix a few
bugs... Cheers

Rob
.

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