Front page | perl.perl5.porters |
Postings from April 2008
On 02/04/2008, Dave Mitchell <davem@iabyn.com> wrote:
> On Tue, Apr 01, 2008 at 02:49:47PM +0100, Nicholas Clark wrote:
> > I don't know how long it took Dave to
> > implement in-place sort (`@glurp = sort @glurp`)
>
>
> My vague recollection is that it was quite hard, and then I broke
> something (can't remember what now).
hange 22839 by davem@davem-percy on 2004/05/22 11:15:34
[perl #29790] Optimization busted: '@a = "b", sort @a' drops "b"
Fix the sort-in-place optimization of change #22349.
> Generally, optimisations that involve examining an area of the optree looking
> for a particular pattern and replacing it with something else, are hard
> to do, and are very fragile - a slight change to the optree (something as
> trivial as an op_null added or removed by some other fix), and the
> optimisation gets inadvertently disabled, or worse, breaks things.
And it's difficult to write exhaustive tests for those.
I remember a couple of bugs with the introduction op_rcatline as well.
Thread Previous
|
Thread Next