[GHC] #13336: Improve or remove the glomming warning
GHC
ghc-devs at haskell.org
Mon Feb 27 08:30:50 UTC 2017
#13336: Improve or remove the glomming warning
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Reporter: mpickering | Owner: (none)
Type: task | Status: new
Priority: low | Milestone:
Component: Compiler | Version: 8.0.1
Resolution: | Keywords:
Operating System: Unknown/Multiple | Architecture:
| Unknown/Multiple
Type of failure: None/Unknown | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s):
Wiki Page: |
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Comment (by simonpj):
> GHC dutifully warns us about this event but I can't work out why it this
is necessary
The actionable bit (not yet actioned!) is to examine cases where glomming
happens a lot, and check that it is actually necessary. They may all be
legit, but I know from experience that I make mistakes; perhaps there is
an easy win lurking here.
> What is bad about glomming?
Two small things: first, the program is optimised without all the relevant
bindings visible; second, we build a giant Rec and re-analyse it, which
can't be cheap.
--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13336#comment:1>
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