[Mono-dev] [PATCH] Generic sharing: Static field access

[Zoltan Varga]

                   Hi,

A simpler solution would be to emit the code below inline instead of
making a call
to a trampoline at all.

                              Zoltan

>         deref vtable->initialized
>         compare/and
>         ret
>         branch to icall
> so basically just 4-5 instructions executed in the common case instead
> of all the cost of going to unmanaged and back.
>
> There is an alternative solution which we could implement as well,
> though this requires one additional pointer per MonoVTable.
> When the MonoVTable is created this pointer is set to the icall and once
> the type is initialized it is set to a tiny function that just does:
>
>         ret
> With this the initialization becomes a memory dereference and an
> indirect call+ret. The runtime cost is similar to the above solution
> (in AOT code we'd even avoid a PLT call), but it has the additional
> memory overhead.
>
> Other suggestions for optimizing this codepath are welcome as well.
>
> lupus
>
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