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Date: Mon, 9 Jul 2012 10:15:54 +0530
From: Sayantan Datta <>
Subject: Re: Rotate and bitselect investigation

On Mon, Jul 9, 2012 at 6:27 AM, Solar Designer <> wrote:

> On Mon, Jul 09, 2012 at 01:24:14AM +0530, Sayantan Datta wrote:
> > I was able to squeeze in another bitselect optimization in the kernel
> > resulting in 2% performance jump.
> Where did you put that other bitselect()?
F(x,y,z) ((x & y) | (z & (x | y)))==F(x,y,z) (bitselect(x, y, z) ^
bitselect(x, (uint)0, y))

> This is not in magnum-jumbo yet.  Can you commit your latest stuff,
> please?



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