[aarch64-port-dev ] aarch64 port "review"

[Jasty, Ananth]

Gcc does prefetching to great benefit, largely on loops. It also does profile based code opt if that's what you mean but my results have been less impressive on aarch64.

I tried adding prefetching support to macro and template assembler, with what seemed like very solid results but it'll require a more rigorous test. Ed has my poc patch, I'll try to write a more limited, focused patch this week.

Ananth

> On May 9, 2016, at 5:52 AM, Roland Westrelin <rwestrel at redhat.com> wrote:
> 
> 
> Hi Ananth,
> 
> Thanks for your comments.
> 
>> So far the codegen of the aarch64 JIT looks very strong, no major
>> pitfalls to be seen. However, given the nature of aarch64 cores, we
>> are seeing a greater need for predictive pre-fetching, both in
>> compiled code, and in the runtime itself (GC is particularly
>> sensitive).
> 
> C2 has very little support for prefetching. I suppose it's been tried on
> other platforms but I don't know what the history is. Do you know if
> other compilers (gcc for instance) successfully take advantage of
> profiling on arm?
> 
> Roland.