2017-12-17 19:41 GMT+01:00 Henrik Gramner <hen...@gramner.com>: > On Thu, Dec 14, 2017 at 11:16 AM, Martin Vignali > <martin.vign...@gmail.com> wrote: > > 2017-12-13 17:37 GMT+01:00 Henrik Gramner <hen...@gramner.com>: > >> You could also do vextracti128 + 128-bit packuswb instead of 256-bit > >> packuswb + vpermq. > >> > > Sorry don't understand this part > > do you mean 128 bit packuswb + movh for each lane ? > > or something else ? > > packuswb m0, m0 > vpermq m0, m0, q3120 > > vs. > > vextracti128 xm1, m0, 1 > packuswb xm0, xm1 > > Uses a 128-bit op instead of a 256-bit one which is generally > preferable whenever possible. > > Thanks ! I will send a new patch, using this way.
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