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2015-01-28T18:44:42Z stassats: "This is SBCL 0.6.3, a mostly-conforming implementation of ANSI Common Lisp."
2015-01-28T18:48:06Z nyef: stassats: Nice~
2015-01-28T18:48:12Z nyef: Err... s/~/!/.
2015-01-28T18:48:38Z stassats: checking if the my tail-local-call things is present there, it's not
2015-01-28T18:48:44Z stassats: not really eager to bisect, though
2015-01-28T18:51:07Z stassats: removing https://github.com/sbcl/sbcl/blob/master/src/compiler/life.lisp#L464 this condition eliminates the problem
2015-01-28T18:51:16Z stassats: although the generated code is quite weird
2015-01-28T18:55:27Z nyef: The implicit-value-cell-tn-p thing?
2015-01-28T18:55:47Z stassats: yes
2015-01-28T18:56:20Z nyef: Git blame it?
2015-01-28T18:56:28Z nyef: I wrote that bit.
2015-01-28T18:56:46Z stassats: the whole thing is new
2015-01-28T18:56:51Z stassats: so it's not causing the problem
2015-01-28T18:57:05Z stassats: the problem (defun test (x) (err x) (flet ((tail ())) (declare (notinline tail)) (tail)))
2015-01-28T18:57:12Z stassats: (test 1) > (TEST :INVALID-VALUE-FOR-UNESCAPED-REGISTER-STORAGE)
2015-01-28T18:57:40Z stassats: because some global conflicts for X are marekd as :read-only, not :live
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2015-01-28T18:59:30Z nyef: Hrm. Lovely.
2015-01-28T19:00:13Z stassats: and the X tn is of the :debug-environment kind, so the debugger expects to find its value everywhere
2015-01-28T19:00:43Z stassats: but it neither has a save location, nor is it residing on the stack
2015-01-28T19:01:05Z stassats: hence the :invalid-value-for-unescaped-register-storage, and in some other cases, bad values from the stack
2015-01-28T19:01:16Z nyef: Good luck?
2015-01-28T19:01:30Z stassats: not much luck so far
2015-01-28T19:02:12Z stassats: poring over life.lisp
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2015-01-28T19:04:21Z stassats: under sting which could be a useful thing, aside this bug
2015-01-28T19:04:27Z stassats: understanding
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2015-01-28T19:18:23Z stassats: adding https://github.com/sbcl/sbcl/blob/master/src/compiler/life.lisp#L464 (or (block-tail-local-call-fun 1block)) to this also fixes the problem
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2015-01-28T19:35:37Z stassats: still doesn't solve the original problem
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2015-01-28T20:17:27Z nyef: s/weird/recursive/.
2015-01-28T20:18:12Z stassats: it produces a non-local call from the XEP
2015-01-28T20:18:16Z stassats: which is weird
2015-01-28T20:18:46Z stassats: or a non-tail local call, not sure, but a call nonetheless
2015-01-28T20:23:16Z stassats: it seems like i know how to avoid the original problem, by swiping it under the carpet
2015-01-28T20:23:32Z stassats: the unused argument is not being used in reality
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2015-01-28T20:35:41Z stassats: ok, now i need to find me a test case, since i just killed the previous one from the compiler
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2015-01-28T23:52:24Z stassats: found a test case: (defun foo (&optional x) (declare (optimize (speed 2))) (if x (foo) (err x)) 1)
2015-01-28T23:53:06Z stassats: so, a call (i assume a local one) from the optional is not getting the X globally live
2015-01-28T23:53:21Z stassats: or rather, it specifies the wrong save-tn
2015-01-28T23:54:41Z stassats: i'm more surprised why is optional not tail-calling the main function, i guess recognize self calls does something weird