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Date: Thu, 18 Jan 2007 18:12:59 -0800
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To:  ilia@prohost.org
CC: Dmitry Stogov <dmitry@zend.com>,  internals@lists.php.net, 
 'Andrei Zmievski' <andrei@gravitonic.com>,
 'Andi Gutmans' <andi@zend.com>
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Subject: Re: [PHP-DEV] Giving Globals the CV treatment [WAS: Runtime JIT Proposals]
From: pollita@php.net (Sara Golemon)

ilia@prohost.org wrote:
> The optimizer already does most of those things, so I think things like 
> that are best left there rather then being done in the core.
> 
How exactly does the (by "the" I presume you mean "your") optimizer 
manage to turn $_POST['foo']  into a single CV based DIM fetch?  The 
current get_ptr_ptr_cv semantics only pull from EG(active_symbol_table)...

Or do you mean that they turn:
ZEND_FETCH_R $0 'GLOBALS' (global)
ZEND_FETCH_DIM_R $1 $0 'foo'

Into:
ZEND_FETCH_R $1 'foo' (global)

And:
ZEND_BEGIN_SILENCE
ZEND_FETCH_R $0 'foo' (local)
ZEND_FETCH_DIM_R $1 $0 'bar'
ZEND_END_SILENCE

Into:
ZEND_BEGIN_SILENCE
ZEND_FETCH_DIM_R $1 !0 'bar'
ZEND_END_SILENCE

With !0 being a newly generated CV pointing at $foo

-Sara