#5536: IO performance regression in 7.2 vs 7.0
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Reporter: simonmar | Owner: batterseapower
Type: bug | Status: new
Priority: high | Milestone: 7.4.1
Component: libraries/base | Version: 7.2.1
Keywords: | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Comment(by batterseapower):
Other optimisations:
* Reassociate the arithmetic in (de)surrogatifyRoundtripCharacter so
that GHC can constant-fold a subtraction. No change to runtime, but the
Core looks better
* Ensure that unpack returns a list with evaluated elements (due to
pointer-tagging, this should prevent ping-ponging between the list
consumers code and the code of desurrogatifyRoundtripCharacter). Reduces
binary Cat to 1.7s.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/5536#comment:4>
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