Axp-List Archive
Re: different alpha cpu compatibility issues?

Subject: Re: different alpha cpu compatibility issues?
From: Jay Estabrook (
Date: Tue Mar 28 12:00:21 2000

On Tue, Mar 28, 2000 at 01:21:43PM -0600, Hoover, Tony wrote:
> Some of the incompatibilities can be over come with PAL code, however
> relying on PAL code to do such things as Byte/Word manipulations will slow
> the older machines to a crawl if you are doing much. If you compile for the
> 21064 ( EV4 ) is "safest", however speed improvements could be noticed on
> newer processors if the application was optimized for that core.

Best bet is to compile for EV5; this will run on EV4 or EV45 (no added
instructions when going from EV4 to EV5), but be scheduled better for
EV5, EV56, and EV6.


Jay A Estabrook Alpha Engineering - LINUX Project
Compaq Computer Corp. - MRO1-2/K20 (508) 467-2080
200 Forest Street, Marlboro MA 01752

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