Front page | perl.perl5.porters |
Postings from May 2012
On 05/18/2012 07:45 AM, Steffen Mueller wrote:
> On 05/16/2012 01:00 AM, Eric Brine wrote:
>> On Mon, May 14, 2012 at 7:37 PM, Father Chrysostomos via RT
>> <perlbug-followup@perl.org <mailto:perlbug-followup@perl.org>> wrote:
>> > Replacing the entersub op with something else is what
>> > cv_set_call_checker is for.
>>
>> I haven't found an example that removes from the opcode tree. How would
>> I fill in the following call checker
>
> Maybe still useful: pp_sort detects and removes the branches of the op
> code tree that it can optimize with special purpose implementations of
> sort subs (basically variants of {$a cmp $b}. There's an old-ish branch
> of mine in the perl repository which adds optimization for {$a->[0] cmp
> $b->[0]} and its variants, but I could never really get the failure
> modes right when somebody passes in the wrong data structures. Mostly
> for lack of diligence. Look for "smueller/..." branches.
I failed to mention something here. It'll be obvious to most, but it's
probably still worth stating: Don't do something like this at run time.
OP trees being shared, this will break threaded perls.
I still eventually want to find a large gob of time and clue to make
them thread safe. There's an old thread about that on this list. Look
for Zefram's replies, as usual they're really good.
--Steffen
Thread Previous
|
Thread Next