mirror of
https://github.com/php/php-src.git
synced 2026-04-08 00:22:52 +02:00
6a6e91f3c7
Struct members require some alignment based on their type. This means that if a struct member is not aligned, there will be a hole created by the compiler in the struct, which is wasted space. This patch reorders some of the most commonly used structs, but in such a way that the fields which were in the same cache line still belong together. The only exception to this is exception_ignore_args, which was temporally not close to nearby members, and as such I placed it further up to close a hole. On 64-bit Linux this gives us the following shrinks: * zend_op_array: 248 -> 240 * zend_ssa_var: 56 -> 48 * zend_ssa_var_info: 48 -> 40 * php_core_globals: 672 -> 608 * zend_executor_globals: 1824 -> 1792 On 32-bit, the sizes will either remain the same or will result in smaller shrinks.