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:
Support for __debugInfo (Joe Watkins)
Optimize ZEND_POW (Rouven Weßling)
gcov: tentative fix for broken coverage data after fix for opcache coverage slightly hackish, but works. The idea is that we want to give priority to .gcda files in .libs dirs vs the files in the upper level dir
gcov: tentative fix for broken coverage data after fix for opcache coverage slightly hackish, but works. The idea is that we want to give priority to .gcda files in .libs dirs vs the files in the upper level dir
Prevent recursion in ZF2 Parameters class
adding NEWS block for beta4
5.4.30 next
enable email notifications
update NEWS
update NEWS
update NEWS
- Updated to version 2014.3 (2014c)
fix bug #67253: timelib_meridian_with_check out-of-bounds read
Fix bug #67252: convert_uudecode out-of-bounds read
Fix bug #67251 - date_parse_from_format out-of-bounds read
Fix bug #67250 (iptcparse out-of-bounds read)
Conflicts:
ext/opcache/zend_persist.c
ext/spl/spl_array.c
It should be accessed using Z_CACHE_SLOT() macro.
zend_literal structure is removed.
API functions that accepted pointer to zend_literal now accept pointer to zval or cache_slot directly.
Calls of such functiond that now accept cache_slot need to be changed to pass -1 instead of NULL.
