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2014-12-03T06:15:43Z pillton: I am having a weird issue where consing occurs depending on the COND form.
2014-12-03T06:15:47Z pillton: http://hastebin.com/acexiyiyih
2014-12-03T06:17:57Z pillton: In both cases only the first condition is executed, yet for some reason, the longer COND form conses and the shorter one doesn't.
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2014-12-03T07:16:20Z stassats: pillton: of course it does
2014-12-03T07:19:20Z stassats: i naturally misread things
2014-12-03T07:25:02Z stassats: weird
2014-12-03T07:26:27Z stassats: really really weird
2014-12-03T07:30:01Z stassats: ok, i think i see
2014-12-03T07:30:25Z stassats: of course no idea how to fix that
2014-12-03T07:37:15Z stassats: basically the return type of the COND is double-float, all is well until it wants to return it, welcome to boxing
2014-12-03T07:37:40Z stassats: which is a really cool optimization until you have an existing double float
2014-12-03T07:39:53Z pillton: stassats: Ok. Glad I didn't make a mistake.
2014-12-03T07:40:28Z pillton: I came across it trying to figure out why (coerce x 'double-float) conses when x is a double-float.
2014-12-03T07:40:40Z pillton: The solution to that problem will help with SB-KERNEL:%DOUBLE-FLOAT.
2014-12-03T07:40:53Z pillton: Sorry, the above problem, not "that" problem.
2014-12-03T07:42:16Z stassats: i can just fix SB-KERNEL:%DOUBLE-FLOAT
2014-12-03T07:42:54Z pillton: How, it is the COND form that causes the consing?
2014-12-03T07:43:24Z pillton: Or whatever it is that causes it. I can't get my head around it.
2014-12-03T07:44:31Z stassats: it basically does "oh yeah, all the legs return a double float, let's put it into a register"
2014-12-03T07:44:50Z stassats: "mmkay, let's return it, but we need to box the double float from the register to the heap"
2014-12-03T07:45:37Z pillton: So why does the "shorter" function not do it?
2014-12-03T07:46:56Z stassats: it's more simple, a type check and a move
2014-12-03T07:47:21Z pillton: Ah ok. Thanks for the explanation.
2014-12-03T07:47:27Z pillton: Should I file a bug?
2014-12-03T07:48:39Z stassats: yes please
2014-12-03T07:51:07Z stassats: that seems to me like a really hard problem
2014-12-03T07:52:52Z stassats: just make the test case (defun test (number) (declare (type (or double-float single-float fixnum) number)) (cond ((typep number 'double-float) number) ((typep number 'single-float) (coerce number 'double-float)) ((typep number 'fixnum) (coerce number 'double-float))))
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2014-12-03T07:59:51Z pillton: Will do. I will submit it later tonight.
2014-12-03T08:00:30Z stassats: or simpler: (defun test (number) (cond ((typep number 'double-float) number) ((typep number 'single-float) (coerce number 'double-float)) (t 1d0)))
2014-12-03T08:03:29Z pillton: The last one is the best one. I'll say if you change 1d0 to 32 it no longer conses.
2014-12-03T08:03:46Z pillton: Thanks again. I have to go now.
2014-12-03T08:09:44Z stassats: so, the last basic block should be broken up
2014-12-03T08:10:11Z stassats: and  i don't think basic block are primitive enough to know about different move vops
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2014-12-03T15:27:32Z pkhuong: representation selection issue.
2014-12-03T15:30:38Z pkhuong: could probably fix that by noticing that the dest is a return node
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