[DGD] jit for 2.1 vm

[Raymond Jennings]

I assume that it will be generated from bytecode?  (in case you need to
jitify after a snapshot restore with possibly missing source code)

On Wed, Dec 30, 2015 at 3:07 PM, Felix A. Croes <felix at dworkin.nl> wrote:

> Carter Cheng <cartercheng at gmail.com> wrote:
>
> > I am a bit curious as to how the jit is intended to function and to what
> > extent it will map instructions into machine code and when it will use
> > function calls and the virtual machine in memory argument stacks.
> >
> > I have examined only two jit's and not completely as of yet (v8 and the
> > llvm jvm jit) so I am not entirely sure how they cope with this issue in
> > detail but it seems that most of them map if possible data values into
> > registers rather than using the cache to hold values in a stack. This
> would
> > seem in particular to be the canonical strategy for handling this in llvm
> > since it uses single static assignment form natively.
> >
> > From the description I am getting will the jit for 2.1 use the existing
> > stack pointer?
>
> I recommend that you also take a look at the LPC-to-C code generator in
> DGD 1.4-stable, which puts integer values in registers but keeps the
> rest on the VM stack.
>
> As to the future JIT compiler, it's not been written yet, and there will
> likely be different iterations with different capabilities, but I intend
> that the first version will produce code at the quality level of the
> LPC-to-C precompiler, or better.
>
> Regards,
> Felix Croes
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