Date: Wed, 23 Jun 1999 10:30:20 +0100 (BST) From: Doug Rabson <dfr@nlsystems.com> To: Bram Stolk <bram@nuson.nl> Cc: freebsd-alpha@freebsd.org Subject: Re: Significant speedups from -mcpu=ev56 Message-ID: <Pine.BSF.4.05.9906231029280.80685-100000@herring.nlsystems.com> In-Reply-To: <3770A713.60311213@nuson.nl>
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On Wed, 23 Jun 1999, Bram Stolk wrote: > Hi, > > Will code compiled with -mcpu=ev56 still run on ancient alphas? > Or will there be made use of instructions that are only available > on the ev56 machines? > > Added performance is great, but if it hurts compatibility, I am > not so sure I want it. It will break on old alphas. I think NetBSD recently added code to their kernel to emulate these instructions which would allow them to work (with a performance penalty). -- Doug Rabson Mail: dfr@nlsystems.com Nonlinear Systems Ltd. Phone: +44 181 442 9037 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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