the main idea - the smaller the zend_op structure, the lees memory traffic is required to load VM instructions during execution. The patch reduces the size of each opcode from 48 to 32 bytes (saves 16 bytes for each opcode, and applications use thousands of opoceds). This reduced the number of CPU cache misses by 12% and improved performance of real-life apps by 1-2%.
The patch affects how constants and jump targets are represented in VM during execution. Previously they were implemented as absolute 64-bit pointers. Now they are relative 32-bit offsets.
In run-time constant now should be accessed as:
RT_CONSTANT(op_array, opine->op1) instead of opline->op1.zv
EX_CONSTANT(opline->op1) instead of opline->op1.zv
Jump targets:
OP_JMP_ADDR(opline, opline->op2) instead of opline->op2.jmp_addr
The patch doesn't change zend_op representation for 32-bit systems. They still use absolute addresses. The compile-time representation is also kept the same.
* master: (46 commits)
PHP_INT_MIN and _MAX tests
NEWS and UPGRADING
Added PHP_INT_MIN
Fix wrong lenght size
Bug #51096 - Remove unnecessary ? for first/last day of
Moved streams related functions to xp_ssl.c
Remove duplicate NEWS
Update NEWS
Update NEWS
Update NEWS
BFN
BFN
Fixed bug #67715 (php-milter does not build and crashes randomly).
We need to turn off any strict mode here for this warning to show up
Disable restrictions regarding arrays in constants at run-time. For the discussion around it, see the thread on the mailing list: http://www.mail-archive.com/internals@lists.php.net/msg68245.html
Revert "Fix bug #67064 in a BC safe way"
Updated NEWS for #67693
Updated NEWS for #67693
Fixed bug #67693 - incorrect push to the empty array
add missing entry to NEWS
...
Conflicts:
Zend/tests/errmsg_040.phpt
Zend/tests/ns_059.phpt
Zend/zend_language_parser.y
Zend/zend_vm_def.h
ext/openssl/openssl.c
ext/reflection/php_reflection.c
ext/session/session.c
ext/spl/spl_directory.c
ext/spl/spl_iterators.c
ext/sqlite3/sqlite3.c
ext/standard/array.c
* master:
Removed second zval_copy_ctor()
Fixed crash on self-referencing constant expression (part of a constant AST)
Fixed support for constant arrays in context of "const" statement (Zend/tests/constant_expressions_arrays.phpt failed when opcache.protect_memort was set)
Conflicts:
Zend/zend_ast.c
Zend/zend_vm_def.h
Zend/zend_vm_execute.h
ext/reflection/php_reflection.c
This API is experemental. It may be changed or removed.
It should be used only for really often used functions.
(Keep the original parsing code and wrap usage with #ifndef FAST_ZPP)
