[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):  Phab:3391
       Wiki Page:                    |
-------------------------------------+-------------------------------------

Old description:

> Need to look at some modest performance regressions for the main join-
> point patch (#12988, wiki [wiki:SequentCore]):
>
> * `perf/compiler/T9961`: `bytes_allocated`
> * `perf/compiler/T10356`: `bytes_allocated`
> * `perf/compiler/T1969`: `max_bytes_used`
> * `perf/compile/T9020`: see
> [https://git.haskell.org/ghc.git/commitdiff/c2becee48aa73795cbf04905f3891f543f1c746e]
> * `deriving/perf/T10858`: `bytes_allocated`

New description:

 Need to look at some modest performance regressions for the main join-
 point patch (#12988, wiki [wiki:SequentCore]):

 * `perf/compiler/T9961`: `bytes_allocated`
 * `perf/compiler/T13056`: `bytes_allocated`
 * `perf/compiler/T1969`: `max_bytes_used`
 * `perf/compile/T9020`: see
 [https://git.haskell.org/ghc.git/commitdiff/c2becee48aa73795cbf04905f3891f543f1c746e]
 * ~~`deriving/perf/T10858`: `bytes_allocated`~~ (was due to `-dcore-lint`)

--

Comment (by rwbarton):

 One of the performance test regressions was due to Core Lint running more
 and is fixed by the above patch. The others remain to be investigated.

--
Ticket URL: <http://ghc.haskell.org/trac/ghc/ticket/13220#comment:35>
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