On 27/set/2005, at 14:04, Immanuel Litzroth wrote:
Hmm, I would assume SBCL/CMUCL translate sb-alien:int and c-call:int to a fixnum already but I can't say that I checked. Is my assumption incorrect?
Not if the int is 32 bits. You get a efficiency not about this when compiling with speed set to 3. If the int is only 30 bit the note goes away and I have some code where this was important (ffi to portmidi).
Ah, right... that makes sense. Anyway this is a pretty specific optimization, right? I mean, this makes sense only for int and (long) long. Well, and when one is using long's it's very likely that one will be handling values bigger than most-positive-fixnum anyway.
Did I miss any other cases?
I think the two different design decisions are best exemplified in cmucl (lists of objects with finalizers, but when the finalizer is run your object has already been garbage collected) and lispworks where the object is passed to the finalizer.
Cool, thanks. I'll check those out.
"Luis Oliveira" luismbo@gmail.com writes:
On 27/set/2005, at 14:04, Immanuel Litzroth wrote:
Hmm, I would assume SBCL/CMUCL translate sb-alien:int and c-call:int to a fixnum already but I can't say that I checked. Is my assumption incorrect?
Not if the int is 32 bits. You get a efficiency not about this when compiling with speed set to 3. If the int is only 30 bit the note goes away and I have some code where this was important (ffi to portmidi).
Ah, right... that makes sense. Anyway this is a pretty specific optimization, right? I mean, this makes sense only for int and (long) long. Well, and when one is using long's it's very likely that one will be handling values bigger than most-positive-fixnum anyway.
Did I miss any other cases?
nope, that's about it.
I think the two different design decisions are best exemplified in cmucl (lists of objects with finalizers, but when the finalizer is run your object has already been garbage collected) and lispworks where the object is passed to the finalizer.
Cool, thanks. I'll check those out.
Thank you! Immanuel
-
Immanuel Litzroth -
Luis Oliveira