Wilco Dijkstra wrote:
> Ramana Radhakrishnan wrote:
>> On Wed, Dec 14, 2016 at 5:43 PM, Wilco Dijkstra <wilco.dijks...@arm.com>
>> wrote:
>
> > > Yes, the reason to split the pattern was to introduce the '!' to
> > > discourage Neon->int moves on Cortex-A8
> (https://patches.linaro.org/patch/541/). I am not removing the optimization
> for Cortex-A8, however
> I haven't been able to find an example where it makes a difference, even on
> high register pressure code.
> >
> > even on crafty with -mtune=cortex-a8 ?
>
> Indeed the '!' makes no difference on crafty either with -mcpu=cortex-a8
> -mfpu=neon.
> Even if it did make a difference in the past, it is either totally ignored by
> the register
> allocator or has no useful effect on deciding whether to use a Neon or
> integer register.
Any comments?
Wilco
