Messages in this thread | | | Subject | Re: Specific support for Intel Atom architecture | From | Harvey Harrison <> | Date | Wed, 13 May 2009 22:04:13 -0700 |
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On Tue, 2009-05-12 at 10:45 -0700, Ulrich Drepper wrote: > On Tue, May 12, 2009 at 8:04 AM, Andi Kleen <andi@firstfloor.org> wrote: > > The problem is that you can't express the situations where > > movbe is better than bswap (you need both and the old and the new > > value) in inline assembler in a way that gcc decides automatically. > > True. But I was mostly thinking about loads from memory. A quick > search for ntoh*/hton* shows code like > > u_int16_t queue_num = ntohs(nfmsg->res_id); > > If there would be a ntohs_load() macro movbe could be used.
It's called be16_to_cpup, or on x86, swab16p()
Cheers,
Harvey
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