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Postings from October 2002
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
300
leo
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