Re: Register allocation

kamalp@acm.org (Kamal R. Prasad)
13 Aug 2004 17:34:14 -0400

          From comp.compilers
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Re: Register allocation kym@sdf.lonestar.org (russell kym horsell) (2004-08-09)
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[11 later articles]
| List of all articles for this month |
From: kamalp@acm.org (Kamal R. Prasad)
Newsgroups: comp.compilers
Date: 13 Aug 2004 17:34:14 -0400
Organization: http://groups.google.com
References: 04-07-044 04-07-074 04-08-022 04-08-041 04-08-050
Keywords: registers
Posted-Date: 13 Aug 2004 17:34:14 EDT

anton@mips.complang.tuwien.ac.at (Anton Ertl) wrote in message news:04-08-050...
> russell kym horsell <kym@sdf.lonestar.org> writes:
> >Kamal R. Prasad <kamalp@acm.org> wrote:
> >[...]
[snip]
>
> Executive summary of the latter: For one application (Gforth), using
> explicit register allocation in addition to the gcc -O2 register
> allocator gives speedups by a factor of 2-5 on an Athlon 1200 (and
> similar on a Pentium III) and does not have a big effect on the
> Pentium 4.
>
> - anton


There is also another feature i.e hardware multi-threading which helps
overcome latencies arising from a bad allocation strategy. The POWER 4
processor uses this and some other means of extracting parallelism to
ensure that unoptimized code does run efficiently on it.


regards
-kamal

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