#9291: Don't reconstruct sum types if the type subtly changes
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Reporter: schyler | Owner: nomeata
Type: feature request | Status: closed
Priority: normal | Milestone:
Component: Compiler | Version: 7.8.2
Resolution: fixed | Keywords:
Operating System: Unknown/Multiple | Architecture:
Type of failure: Runtime | Unknown/Multiple
performance bug | Test Case:
Blocked By: | Blocking:
Related Tickets: | Differential Rev(s): Phab:D2871
Wiki Page: |
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Comment (by heisenbug):
Replying to [comment:42 Joachim Breitner
In [changeset:"19d5c7312bf0ad9ae764168132aecf3696d5410b/ghc" 19d5c73/ghc]: {{{ #!CommitTicketReference repository="ghc" revision="19d5c7312bf0ad9ae764168132aecf3696d5410b" Add a CSE pass to Stg (#9291)
...
Introduces the flag -fstg-cse, enabled by default with -O for now. It might also be a good candidate for -O2.
Will you revisit the `-O2` inclusion sometime later? /me was always under the impression that all performance-increasing optimisations from `-O` would be included in `-O2`.
Differential Revision: https://phabricator.haskell.org/D2871 }}}
-- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/9291#comment:44 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler