From:	John Horigan <jhorigan AT mipos3 DOT intel DOT com>
Subject:	Re: GCC optimization & target option
To:	djgpp AT sun DOT soe DOT clarkson DOT edu (DJGPP mailing list)
Date:	Wed, 30 Mar 94 9:18:05 PST

> 
> Intel is a ass.  (Apologies to Dickens).  Again, the Pentium doesn't have
> that many new instructions; the difference is in the timing that changes
> depending upon how you order the instructions.  With the Pentium, you can
> schedule two instructions so that they are executed simultaneously (this
> somewhat super scalar approach is what gives the pent some of it's speed
> up).  Only certain instructions can be  executed simultaneously, however,
> and Intel makes those who want to know that info sign non-disclosure forms.
> Since GCC is available in source, it's kind of disclosed... therefore....
> 

Wrong. All the information on instruction pairing and pipeline flow is
in the Pentium (TM) Processor User Manuals, vol. I chap. 3, and vol. III
chap. 24, available through Intel Literature Sales 1-800-548-4725, order
numbers 241428 through 241430. The stuff in appendix H that you need to 
sign a nondisclosure agreement to see is pretty esoteric, DJ might find 
some of it interesting for GO32 but you don't need it for compiler writing.


--------------------------------------------------------------------------
John W. Horigan     MCG       Logic Design Engineer           M/S: SC9-25
Intel, Santa Clara  (408)765-4773  jhorigan AT mipos3 DOT intel DOT com  SC9-2 pole C4

'Random mating is good for debunking sex myths.' -- Jenny Holzer

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