Today I built PHP 4.4.4, PHP 5.0.5, PHP 5.1.6, and current PHP_5_2 (the
last two each with CALL, GOTO, and SWITCH VMs) with GCC 3.4.6 and
GCC 4.1.1 with -O{0|1|2|3|s} [1].
That's a nice trick considering that PHP4 doesn't have a CALL or GOTO vm...
These results also beg the question how well supported/tested the two
alternative executers, GOTO and SWITCH, are.
My guess is that there are only about ten people using alternate VMs to
any serious degree and maybe a hundred who "tried it once". The VMs
aren't a heavily advertised feature and I personally like the
flexibility of the CALL version best.
-Sara
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