freenode/#sbcl - IRC Chatlog

15:58:36 borodust scymtym: it's not the problem per se, cuz they are properly deallocated during garbage collection

15:58:46 borodust i just wonder where the gargabe is coming from

16:02:28 scymtym borodust: i see. i have no good advice then. maybe compile with SPEED 3 and look for SAP boxing notes (I think they say "doing SAP to pointer conversion")

16:13:35 borodust i see, thanks

16:18:06 borodust yeah, there are some "SAP to pointer coercion" things, i'll look into them

17:18:12 mrcode_ is there a way to make an array of uint8 with sbcl and get an address of an underlying storage or is this something best done with aliens ?

18:17:15 saturn2 mrcode_: i believe you can use sb-sys:vector-sap to get a pointer to the underlying storage

18:19:15 saturn2 but it's probably better to use aliens unless you have a good reason not to

18:34:36 mrcode_ saturn2: cool. thx a lot ! i'm exploring the feasibility of avoiding conversions from aliens to vectors given that they mostly feel like no-ops despite of doing work

18:35:11 mrcode_ are those pointers fixed or do they move as part of GC ?

18:36:06 saturn2 they can move, you will want to use sb-sys:with-pinned-objects

18:38:06 mrcode_ ok. thx!

19:30:25 |3b| might also look at the static-vectors lib

19:39:47 saturn2 ah, yeah, that's a better idea :)

19:44:33 |3b| depends on context, pin + vector-sap might be better for optimizing cases where you don't create the vectors

19:46:20 |3b| or if you don't care about portability and have long-lived vectors. static-vectors has some annoying limitations due to portability, so you need to explicitly free them but can't distinguish them from normal vectors that don't need freed

20:57:27 scymtym dougk_: i believe binding the gensym counter to 1 in SB-XC:GET-SETF-EXPANSION breaks SHIFT: (shiftf a b c) macroexpands to (LET* ((#:OUT665 A) (#:NEW1 B) (#:NEW1 C)) (SETQ A #:NEW1) (SETQ B #:NEW1) (VALUES #:OUT665)). do you remember what the justification was?

20:59:02 pkhuong scymtym: is that with print-circle?