[PATCH 3/3] powerpc: bpf: implement in-register swap for 64-bit endian operations

['Naveen N. Rao']

On 2017/01/13 05:17PM, David Laight wrote:
> From: Naveen N. Rao
> > Sent: 13 January 2017 17:10
> > Generate instructions to perform the endian conversion using registers,
> > rather than generating two memory accesses.
> > 
> > The "way easier and faster" comment was obviously for the author, not
> > the processor.
> 
> That rather depends on whether the processor has a store to load forwarder
> that will satisfy the read from the store buffer.
> I don't know about ppc, but at least some x86 will do that.

Interesting - good to know that.

However, I don't think powerpc does that and in-register swap is likely 
faster regardless. Note also that gcc prefers this form at higher 
optimization levels.

Thanks,
Naveen