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Re: Problem with NSString
From: |
Ivan Vučica |
Subject: |
Re: Problem with NSString |
Date: |
Mon, 31 Jan 2011 00:59:39 +0100 |
On 30. sij. 2011., at 23:29, David Chisnall <theraven@sucs.org> wrote:
On 30 Jan 2011, at 21:35, Ivan Vučica wrote:
That is awesome?
Just want to point out this was supposed to ve "This is awesome!" with
an exclamation mark ;-)
I mistyped this and it looks quite rude. Sorry!
Perhaps optimization pass could take a look if NSString subclasses
exist and optimize if that is not the case as well?
There's already a profile-driven pass that will look at this in
libobjc2 svn. In fact, it doesn't check if there are subclasses, it
checks if the instances are always (or usually) the same class (so,
even if they are GSSubString or something, it will still work). If
they are then it adds a cache for the lookup and tries speculative
inlining.
If the speculative inlining works, then it's slightly faster tan a C
function call that is not inlined (of course, any place where
speculative inlining will work, C static inlining will also work, so
C will actually be faster).
This is currently only done in an experimental optimisation pass
on my machine, but it will probably become one of the standard
Objective-C passes used by clang for the GNUstep runtime sometime
this year.
Great! I am looking forward to this.
Ditto!
I'll try to finish / commit it at FOSDEM then.
It's not a high priority, because message send overhead is rarely
the bottleneck for message sends to strings. I just put it together
because I'm a bit OCD when it comes to optimising stuff...
David
-- Sent from my IBM 1620
- Problem with NSString, Parag Deshpande, 2011/01/30
- Re: Problem with NSString, Stefan Bidi, 2011/01/30
- Re: Problem with NSString, Ivan Vučica, 2011/01/30
- Re: Problem with NSString, Lars Sonchocky-Helldorf, 2011/01/30
- Re: Problem with NSString, David Chisnall, 2011/01/31
- Re: Problem with NSString, Ivan Vučica, 2011/01/31
- Re: Problem with NSString, David Chisnall, 2011/01/31
- Re: Problem with NSString, Ivan Vučica, 2011/01/31
- Message not available
- Re: Problem with NSString, Ivan Vučica, 2011/01/31
Re: Problem with NSString, Ivan Vučica, 2011/01/30