Date: Thu, 09 Nov 1995 02:59:42 -0800 From: "Amancio Hasty Jr." <hasty@rah.star-gate.com> To: Luigi Rizzo <luigi@labinfo.iet.unipi.it> Cc: phk@critter.tfs.com (Poul-Henning Kamp), koshy@blr.novell.com, freebsd-hackers@freebsd.org Subject: Re: Load/Store using FPU regs ... Message-ID: <199511091059.CAA03746@rah.star-gate.com> In-Reply-To: Your message of "Thu, 09 Nov 1995 11:25:53 %2B0100." <199511091025.LAA08155@labinfo.iet.unipi.it>
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>>> Luigi Rizzo said: > > > Now, I'm not sure if this approach can be used across all processors. > > > Some FPU's could raise exceptions if illegal bit-patterns are loaded > > > into its registers. The x86 FPU in particular has very few registers > > > and a LIFO access pattern for loads and stores so I don't know if the > > > same trick would work well for it. > > > > Not to mention that you might not have a FPU. > > So what ? You still have the FPU emulator :) Just ignore Pohl's comment we can probably figure out a clever way to find out if we have a FPU . What would be nice to see is if there is indeed a performance gain by using the floating point instructions if there is for sure I will use it. Cheers, amancio
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