Messages in this thread |  | | Date | Tue, 13 Jun 2006 13:10:54 -0700 | From | Arjan van de Ven <> | Subject | Re: [PATCH -mm] i386 usercopy.c opcode reordering (pipelining) |
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Andreas Mohr wrote: > Hi all, > > this one wrote to register %0 and immediately right-shifted it, > so let's andl register %3 first for better parallelism (rrright?).
have you benchmarked this? I would actually expect no difference since a reg-reg move is basically a thing for the register rename engine which then... well it's supposed to be near free like this. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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