[GHC] #12916: GHC 8.0.1 vs GHC HEAD (8.1.20161202) doesn't do inlining and unboxing very well

[GHC]

#12916: GHC 8.0.1 vs GHC HEAD (8.1.20161202) doesn't do inlining and unboxing very
well
-------------------------------------+-------------------------------------
        Reporter:  alexbiehl         |                Owner:
            Type:  bug               |               Status:  new
        Priority:  normal            |            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:                    |
-------------------------------------+-------------------------------------

Comment (by RyanGlScott):

 Replying to [comment:6 alexbiehl]:
 > That could be the case indeed: I invoked `hadrian -j --flavour=quickest`
 to build the compiler.

 I think `quickest` might very well be the culprit. From `mk/build.mk`:

 {{{
 # Even faster build.  NOT RECOMMENDED: the libraries will be
 # completely unoptimised, so any code built with this compiler
 # (including stage2) will run very slowly:
 #BuildFlavour = quickest
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/12916#comment:7>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler