I think it's better to apply the same patch to 5.4 and 5.5 as well.
It's absolutely safe.
On Fri, Jun 21, 2013 at 12:51 PM, Ard Biesheuvel
> On 20 June 2013 23:28, Christopher Jones <christopher.jo...@oracle.com>
> > Your @internals mail said "building the executor without
> > specialization is broken" so the patch seems like a standard bug fix
> > that should be merged to 5.4 & 5.5.
> By 'building' I mean running 'zend_vm_gen.php --without-specializer'
> to generate zend_vm_opcodes.h and zend_vm_execute.h, which is a way
> that is arguably non-standard, proven by the fact that this particular
> mode has been broken since November 2010. In fact, when running this
> script in the conventional way, the produced code is identical to the
> code that is already in the repository.
> @Dmitry: there's a request to backport the FREE_OP2() fixes to 5.5 and
> 5.4, what do you think?