Re: HLL expression -> ASM

henry@spsystems.net (Henry Spencer)
10 Apr 2001 01:45:45 -0400

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Related articles
[2 earlier articles]
Re: HLL expression -> ASM dummy_addressee@hotmail.com (Alexei A. Frounze) (2001-03-31)
Re: HLL expression -> ASM titzer@expert.cc.purdue.edu (Ben L. Titzer) (2001-03-31)
Re: HLL expression -> ASM rhyde@transdimension.com (Randall Hyde) (2001-03-31)
Re: HLL expression -> ASM marcov@stack.nl (Marco van de Voort) (2001-04-04)
Re: HLL expression -> ASM dummy_addressee@hotmail.com (Alexei A. Frounze) (2001-04-10)
Re: HLL expression -> ASM bill@megahits.com (Bill A.) (2001-04-10)
Re: HLL expression -> ASM henry@spsystems.net (2001-04-10)
| List of all articles for this month |
From: henry@spsystems.net (Henry Spencer)
Newsgroups: comp.compilers
Date: 10 Apr 2001 01:45:45 -0400
Organization: SP Systems, Toronto, Canada
References: 01-03-131 01-03-153 01-03-180
Keywords: code, assembler
Posted-Date: 10 Apr 2001 01:45:45 EDT

Randall Hyde <rhyde@transdimension.com> wrote:
>Note, btw, that Alex failed to mention that the target platform is
>the x86 which has limited registers and each register has some
>special uses that may or may not be needed...


Ah, but is it a *recent* x86? Yes, it makes a difference, because the
modern processors do various kinds of run-time optimization which can
make the actual hardware behave very differently from what the
architecture manual says. I'm told that nowadays, if you slice off a
32-word chunk of memory and pretend it's registers, you will find that
your program behaves as if it was... because the internal on-the-fly
register renaming of the elaborately-pipelined Pentium processors more
or less makes it so.


(This is secondhand info and I regret that I don't know details.)
--
When failure is not an option, success | Henry Spencer henry@spsystems.net
can get expensive. -- Peter Stibrany | (aka henry@zoo.toronto.edu)

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