freenode/#sbcl - IRC Chatlog

14:49:57 stassats why can't we divide via multiplication for signed fixnums?

14:50:00 stassats gcc can

15:49:15 Krystof stassats: I think it "just" takes a bit of work to implement it

15:49:36 stassats the original paper has it, trying to digest

15:52:30 stassats spotted it in get-internal-real-time, that divides by 1000, but the whole thing could be done in C

15:53:09 stassats but making our own gen-signed-truncate-by-constant-expr would benefit more things

15:55:46 stassats and lisp_init_time has to be dereferenced twice, and sb-alien is too primitive to handle using a variable twice

17:10:35 stassats ok, got signed-truncate

17:10:39 stassats now onto signed-floor

17:11:05 stassats had to add a signed-multiply-high vop, wonder if there's something portable

17:12:07 stassats doesn't look like

17:16:02 stassats well, i can do arm64 and x86-64

17:24:14 fiddlerwoaroof stassats: I managed to get the build to complete on my mac (up to make-target-2.sh)

17:24:27 fiddlerwoaroof However, I'm getting this error: ensure_space: failed to allocate 1048576 bytes at 0xf0000000

17:25:54 fiddlerwoaroof I can find the code that prints this message, but I'm wondering what the normal cause of this message is? mmap failing?

17:26:34 stassats sorry, no time to deal with that

17:27:06 fiddlerwoaroof ok

17:28:09 stassats (but sure, mmap)

18:26:55 flip214 with run-program, can I have arbitrary file handles passed on? Ie. create a socketpair or pipe and pass one end as FD 17 or whatever?

19:21:32 stassats the floor code in the paper doesn't make sense to me, as it overflows

19:22:21 stassats flip214: crate a new fd-stream

19:23:02 stassats and didn't get it right in time for the freeze, oh well

19:28:43 stassats ok, no floor then, truncate still helps with idiv, but there's two imuls for floor

0:17:48 White_Flame only in SLIME, this crashes: (stream-external-format *standard-output*)

0:18:33 White_Flame and it seems to pass :EXTERNAL-FORMAT as a parameter that ends up in an ECASE looking for :STREAM-EXTERNAL-FORMAT

0:18:46 White_Flame in the stream dispatcher

0:19:51 White_Flame (this call is being made by some old code I'm running, but crashes standalone in a clean image under slime as well)

0:20:16 stassats stream-external-format is not defined for gray streams

0:20:20 stassats so, don't call it i guess