Re: [Lightning] Bytecode compiler

[Paolo Bonzini]

>>> o Left to right argument evaluation; when passing arguments
>>>   in registers, right to left just make things harder than they
>>>   should be and also unnatural
>>
>> This is fine.  Just allocate all space in jit_prepare and replace push with
>> mov.
>
>  I started adding requirement for a "jit_putarg_x extension"
> requirement in lightning, but I think it may not be the proper
> approach, instead, it should build stack frames, and understand
> the abi without using jit_arg_x and jit_getarg_x.
>
> This is because it really needs to know what arguments were
> passed in registers so that it can spill them when making a
> function call.

Existing backends copy incoming arguments to callee-save registers.
You can do the same.  You don't need putarg, existing opcodes are
enough.

Paolo