freenode/#clasp - IRC Chatlog

13:55:53 wuehlmaus ** NICK Guest49073

14:49:38 selwyn hi everyone

14:53:55 Bike i have a setup now so that operations on bit arrays with displaced-index-offset = 0 (ie most of them) use a simple function that should be insensitive to the "word" size

14:54:13 Bike with nonzero d-i-o they loop over the bits, which will be enormously slower

14:54:21 Bike kind of don't care though

14:57:17 Bike anyway gonna fix a few more things and then see if i can switch it to 64 bit words

15:33:04 Guest49073 ** NICK wuehlmaus

17:20:14 Bike with 64 bits i get wrong results for no obvious reason. figures.

17:24:08 Bike (aref #*1010 2) => 0, fascinating

17:59:32 Bike it started working when i used (value & 1) instead of value in one place, but i don't see what would be passing something other than 1 or 0 as value anyway. this is kind of worrying.

18:09:21 Bike what's the incantation to prevent clang from optimizing a function, so that I can actually look at variables? [[nooptimize]] or something?

18:09:43 Bike DONT_OPTIMIZE_ALWAYS maybe

18:10:38 jackdaniel DONT_OPTIMIZE_ALWAYS_MAYBE :)

18:12:39 Bike i just met you and this is crazy

18:16:14 jackdaniel ACTION assume that either Bike met someone else or he didn't understand the joke

18:16:20 jackdaniel s/assume/assumes/

18:16:28 Bike it's a song lyric

18:16:36 jackdaniel oh, thank you

18:17:08 jackdaniel "call me maybe", funny one; shame I've spoiled it :)

18:29:51 kpoeck Bike: __attribute__((optnone)) perhaps

18:33:19 Bike yeah that's what DONT_OPTIMIZE_ALWAYS expands to

18:33:40 stassats NEVER_OPTIMIZE?

18:34:57 stassats i wonder what constitutes non-optimization, the first ir pass translated into assembly?

19:02:03 Bike the argument is always a bit like it should be

19:02:14 Bike maybe there's some optimization nuttery messing it up that & prevents

19:28:19 Bike other than that weirdness everything seems to work, so maybe now i can get nibble arrays working

19:57:37 Bike i see cando uses some custom bit vector functions. could probably straighten that up a little bit

19:58:00 Bike e.g. SimpleBitVector_inPlaceOr is covered by core__sbv_bit_ior which i already wrote

20:09:07 Bike and there's lowestIndex which is find first set or whatever, and isZero, and ranged eq, all of those could be implemented without checking individual bits