[PATCH] __div64_32: implement division by multiplication for 32-bit arches

[Nicolas Pitre]

On Fri, 30 Oct 2015, Alexey Brodkin wrote:

> Hi Nicolas,
> 
> On Fri, 2015-10-30 at 11:17 -0400, Nicolas Pitre wrote:
> > On Fri, 30 Oct 2015, Måns Rullgård wrote:
> > 
> > > Nicolas Pitre <nicolas.pitre at linaro.org> writes:
> > > 
> > > > OK... I was intrigued, so I adapted my ARM code to the generic case, 
> > > > including the overflow avoidance optimizations.  Please have look and 
> > > > tell me how this works for you.
> > > > 
> > > > If this patch is accepted upstream, then it could be possible to 
> > > > abstract only the actual multiplication part with some architecture 
> > > > specific assembly.
> > > 
> > > Good idea.
> > 
> > Could you please provide a reviewed-by or acked-by tag?
> 
> Sure!
> 
> Acked-by: Alexey Brodkin <abrodkin at synopsys.com>
> 
> BTW I thought about that optimization a bit more and now I think
> we may even skip addition of arch-specific assembly insertions.

I'm going to do it anyway given that I already have it for ARM.  It'll 
be opt-in, so if your arch doesn't provide it then the current C 
implementation will be used by default.


Nicolas