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Re: [RFC] 2. Proposal for _keyed opcodes

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Leopold Toetsch
October 21, 2002 08:49
Re: [RFC] 2. Proposal for _keyed opcodes
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Leopold Toetsch wrote:

> 2. Proposal for _keyed opcodes
> ------------------------------
> The thread with subject "pdd06_pasm, pdd08_keys: _keyed ops" clearly
> showes the shortcomings of the current _keyed opcodes and the
> implementation of these.[1]

> The 3 operand keyed add @a[$i] = @b[3] + %h{"k"}:
>     add_p_ki_p_kic_p_kc

Attached is a proof of concept of my proposal.

A 6 operand 3 keyed op get's rewritten like so:

     /* OP  _p_k    _p_k_p_k =>
      * set      py, p_k
      * set      pz,     p_k
      * new px, .PerlUndef
      * OP  px, py, pz
      * set _p_k_px

- It uses only set_ ops
- only imcc, but with pasm syntax in example

With an approach like this, we could cut down the VTABLE to roughly 1/3 
of it's current size. The _keyed entrys would only consist of the 
set_.._keyed{,_int} variants plus exists_keyed and defined_keyed. And, 
we would never have the opcode explosion to 64 times of current size.

Attached is
- patch to imcc.y
- 3key.imc (example)
- a.pasm (output for above)

$ parrot a.pbc

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