Dear PHP Internals,

I am looking at zend_vm_execute.h file and found some lines of code which I do not quite get.
Who can help tell that why we should have ZEND_COLD attribute in ZEND_VM_HOT line definition,
or I can simply ignore it as it is trivial? Thanks.

if (ZEND_VM_KIND == ZEND_VM_KIND_HYBRID)

                // # define ZEND_COLD __attribute__((cold))

define ZEND_VM_HOT zend_always_inline ZEND_COLD ZEND_OPT_SIZE

define ZEND_VM_COLD ZEND_COLD ZEND_OPT_SIZE

Here is one use of this macro in function declaration.
static ZEND_VM_HOT ZEND_OPCODE_HANDLER_RET ZEND_FASTCALL ZEND_JMP_SPEC_HANDLER(ZEND_OPCODE_HANDLER_ARGS)

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Tony Su (Su, Tao)
make a 'lazy' programmer diligently with efficiency