Moved "zval.u2.cache_slot" into free room of "zend_op"

Avoid repeatable ARG_SHOULD_BE_SENT_BY_REF() checks in FETCH_*FUNC_ARG and following SEND_VAR_EX. Perform the check once in a new CHECK_FUNC_ARG opcode and reuse in the following FETCH_*FUNC_ARG and

Avoid repeatable ARG_SHOULD_BE_SENT_BY_REF() checks in FETCH_*FUNC_ARG and following SEND_VAR_EX. Perform the check once in a new CHECK_FUNC_ARG opcode and reuse in the following FETCH_*FUNC_ARG and SEND_FUNC_ARG (SEND_VAR_EX replacement).

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Changed CATCH instruction format (extended_value moved into op2, op2 into result, result into extended_value)

Changed FETCH_CONSTANT instruction format (extended_value moved into op1)

Changed FETCH_CLASS instruction format (extended_value moved into op1)

Compress handlers table

Make IS_UNUSED to be zero.

Use fastcall calling convention

Added abiliy to mark object specific handlers with most often used operand types as HOT. (UNUSED+CONST and CV+CONST)

Removed unused array

Allow commas in specializer conditions

year++

year++

fixed "unused function" compilation warning

Fix warning in the proper place

Remove duplicate handlers for commutative operations

Move constants into read-only data segment

Reduced VM code size.
Made FETCH_DIM/OBJ_FUNC_ARG to dispatch ro corresponding FETCH_DIM/OBJ_R/_W handlers.
Merged TMP and VAR specializations of ZEND_FETCH_OBJ_R.
Allowed dispatching to

Reduced VM code size.
Made FETCH_DIM/OBJ_FUNC_ARG to dispatch ro corresponding FETCH_DIM/OBJ_R/_W handlers.
Merged TMP and VAR specializations of ZEND_FETCH_OBJ_R.
Allowed dispatching to less specialized handelrs and helpers. (e.g. from OP_TMP_CONST to OP_TMPVAR_CONST).

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Optimization of init_func_execute_data()

Fix ZEND_VM_SPEC=0 build

TYPE_CHECK instruction changed. Now it keeps in extended_value a type mask.
This makes check for "boolean" cheaper and allows check combination e.g. (is_string($a) || is_null($a))

Changed the way VM accesses constant operands in 64-bit builds.

VM refactoring, to avoid passing "execute_data" into helper functions that can access it using global register variable.

Switch to HYBRID VM

HYBRID VM cleanup