[GHC] #14650: Panic with no extensions (StgCmmEnv: variable not found)

[GHC]

#14650: Panic with no extensions (StgCmmEnv: variable not found)
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        Reporter:  Zemyla            |                Owner:  (none)
            Type:  bug               |               Status:  new
        Priority:  normal            |            Milestone:
       Component:  Compiler          |              Version:  8.2.2
      Resolution:                    |             Keywords:
Operating System:  Unknown/Multiple  |         Architecture:  x86_64
 Type of failure:  Compile-time      |  (amd64)
  crash or panic                     |            Test Case:
      Blocked By:                    |             Blocking:
 Related Tickets:                    |  Differential Rev(s):
       Wiki Page:                    |
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Comment (by Simon Peyton Jones <simonpj@…>):

 In [changeset:"1c1e46c1292f4ac69275770ed588401535abec45/ghc"
 1c1e46c1/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="1c1e46c1292f4ac69275770ed588401535abec45"
 preInlineUnconditionally is ok for INLINEABLE

 When debugging Trac #14650, I found a place where we had

     let {-# INLINEABLE f #-}
         f = BIG
     in f 7

 but 'f' wasn't getting inlined at its unique call site.
 There's a good reason for that with INLINE things, which
 should only inline when saturated, but not  for INILNEABLE
 things.

 This patch narrows the case where preInlineUnconditionally
 gives up.  It significantly shortens (and improves) the code
 for #14650.
 }}}

-- 
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/14650#comment:4>
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