[GHC] #13429: Optimizer produces Core with an infinite <<loop>>
GHC
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Fri May 19 19:43:46 UTC 2017
#13429: Optimizer produces Core with an infinite <<loop>>
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Reporter: lehins | Owner: (none)
Type: bug | Status: new
Priority: high | Milestone: 7.10.4
Component: Compiler | Version: 8.0.2
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: Runtime crash | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
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Comment (by simonpj):
Thanks, that's helpful. Does the `fingertree` example of the bug happen
in HEAD? (The other example does not.) Are you sure it's the same bug?
Just for info, I have investigated this a bit, and I know what's going on.
The tricky bit is that we want to specialise dictionary functions (which
arise from instance decls); but they produce dictionaries, and it's rather
easy to mess up.
I think I have a reasonably simple solution, but it's a solition I can't
say is wrong, rather than one that obviously right. So I've been
ruminating, so far to little avail.
Is it actually a show-stopper for anyone?
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13429#comment:17>
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