Date: Mon, 08 May 2006 18:55:48 +0200 From: Ivan Voras <ivoras@fer.hr> To: current@freebsd.org Subject: Re: I_686 MMX / 3DNOW / SSE / SSE2 ? Message-ID: <445F7814.90905@fer.hr> In-Reply-To: <20060508132721.36915d94@Magellan.Leidinger.net> References: <61809.192.168.1.21.1147030254.squirrel@192.168.1.21> <86d5epp5tv.fsf@xps.des.no> <20060508132721.36915d94@Magellan.Leidinger.net>
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Alexander Leidinger wrote: > The patches which port the revamped FPU handling from DFly don't have > this expensive behavior for every switch. AFAIR only when the kernel > used the FPU some context is saved. It also allows to use SIMD > instructions in the kernel (this may be beneficial in some places). For what it's worth - it would be interesting to see if XOR calculations in GRAID3 or VINUM can be speeded up by using SSE (I think SSE3 is needed for 128 bit integer ops?)
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