[GHC] #12412: SIMD things introduce a metric ton of known key things

[GHC]

#12412: SIMD things introduce a metric ton of known key things
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           Reporter:  bgamari        |             Owner:
               Type:  bug            |            Status:  new
           Priority:  low            |         Milestone:
          Component:  Compiler       |           Version:  8.0.1
           Keywords:                 |  Operating System:  Unknown/Multiple
       Architecture:                 |   Type of failure:  Compile-time
  Unknown/Multiple                   |  performance bug
          Test Case:                 |        Blocked By:
           Blocking:                 |   Related Tickets:
Differential Rev(s):                 |         Wiki Page:
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 In #12357 we were looking at reducing the number of entries in the
 `knownKeyNames`. This has the potential to improve compiler performance
 since this set of things is always present in the original name cache,
 which is often referred to.

 #12357 reduced the number of elements in `knownKeyNames` from 2017 to
 1834. Not a bad improvement. That being said, the SIMD operations
 introduce nearly four times that number. These include things like
 `readWord64OffAddrAsWord64X2#`, `indexInt16OffAddrAsInt16X16#`, and
 `remInt16X16#`. All in all these operations constitute nearly a third of
 the known key names.

 I'm not really sure what can be done about this, but I thought it should
 be noted.

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Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12412>
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