[GHC] #13220: Performance regressions in testsuite from join points

[GHC]

#13220: Performance regressions in testsuite from join points
-------------------------------------+-------------------------------------
        Reporter:  lukemaurer        |                Owner:  lukemaurer
            Type:  bug               |               Status:  new
        Priority:  highest           |            Milestone:  8.2.1
       Component:  Compiler          |              Version:  8.1
      Resolution:                    |             Keywords:  JoinPoints
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 Simon Peyton Jones <simonpj@…>):

 In [changeset:"6bab649bde653f13c15eba30d5007bef4a9a9d3a/ghc"
 6bab649b/ghc]:
 {{{
 #!CommitTicketReference repository="ghc"
 revision="6bab649bde653f13c15eba30d5007bef4a9a9d3a"
 Improve checking of joins in Core Lint

 This patch addresses the rather expensive treatment of join points,
 identified in Trac #13220 comment:17

 Before we were tracking the "bad joins".  Now we track the good ones.
 That is easier to think about, and much more efficient; see CoreLint
 Note [Join points].

 On the way I did some other modest refactoring, among other things
 removing a duplicated call of lintIdBndr for let-bindings.

 On teh
 }}}

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13220#comment:20>
GHC <http://www.haskell.org/ghc/>
The Glasgow Haskell Compiler