Nikita Popov
65e456f364
Introduce BIND_LEXICAL
...
This opcodes inserts a local CV into the closure static variable
table. This replaces the previous mechanism of having static
variables marked as LEXICAL, which perform a symtable lookup
during copying.
This means a) functions which contain closures no longer have to
rebuild their symtable (better performance) and b) we can now track
used variables in SSA.
2015-12-29 23:14:53 +01:00
Nikita Popov
33870c525a
Don't reuse SSA var in UNSET_VAR
...
Instead use the SSA var that UNSET_VAR actually defines. Otherwise
we get issues trying to DCE unsets.
2015-12-26 23:33:58 +01:00
Dmitry Stogov
28a016a6dc
Fixed SSA construction for CFG with unreachable BB
2015-12-23 03:52:38 +03:00
Nikita Popov
fdfbeeb296
Always create ARRAY_ELEM ssa var for ELEM_REF
2015-12-22 23:08:26 +01:00
Dmitry Stogov
a75c6d5fb2
Skip "useless" SSA variables for INIT_ARRAY, ADD_ARRAY_ELEMENT, FE_RESET_R
2015-12-22 17:35:08 +03:00
Dmitry Stogov
b4b6d58990
Add ability to prevent "useless" SSA variable creation for "refcounting inference".
2015-12-22 16:43:37 +03:00
Nikita Popov
420ff42bc0
Protect against overflows in pi constraints
2015-12-20 12:56:05 +01:00
Nikita Popov
0da1378a88
long -> zend_long in range inference
2015-12-20 00:06:12 +01:00
Nikita Popov
549d7d4876
Fix Pi constraint for -LONG_MIN adjustments
...
-LONG_MIN == LONG_MIN so bad things will happen.
Example of JIT miscompile:
function test($n) {
if ($n + PHP_INT_MIN == 0) {
$n2 = (int) ($n + PHP_INT_MAX);
var_dump($n2);
}
}
test(PHP_INT_MAX + 1);
2015-12-20 00:06:12 +01:00
Nikita Popov
c9ea8fef96
Extrace find_adjusted_tmp_var() function
...
This code was duplicated for op1 and op2
2015-12-20 00:06:12 +01:00
Nikita Popov
fc68094497
Simplify bf/bt computation in pi placement
...
The meaning of the successors is well-defined, no need to check it.
2015-12-20 00:03:52 +01:00
Nikita Popov
d7424a5b04
Fix typo in pi placement
2015-12-20 00:03:52 +01:00
Dmitry Stogov
74daa98974
Added simple DFA optimisation pattern (just to prove the concept)
2015-12-16 13:14:31 +03:00
Dmitry Stogov
9044f491cc
Use do_alloca() instead of alloca()
2015-12-16 04:59:05 +03:00
Dmitry Stogov
c88ffa9a56
Added e-SSA based DFA optimisation framework (incomplete)
2015-12-16 00:49:44 +03:00
Dmitry Stogov
1fdb63fbd9
ws fixes
2015-12-11 17:40:23 +03:00
Dmitry Stogov
f243aaf985
Added e-SSA based DFA optimisation framework (incomplete)
2015-12-11 17:24:55 +03:00
