#2271: floor, ceiling, round :: Double -> Int are awesomely slow
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Reporter: dons | Owner: daniel.is.fischer
Type: bug | Status: new
Priority: low | Milestone: 7.0.1
Component: libraries/base | Version: 6.8.2
Keywords: performance, math, double | Testcase:
Blockedby: | Difficulty: Unknown
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Changes (by daniel.is.fischer):
* owner: => daniel.is.fischer
Comment:
Okay, GHC's new !CodeGen kicks some serious behind. For Float we only get
a speedup for the Int-special versions (and for round, we should call out
to C). For Double, a few of the general versions (via Integer) run slower
than with 6.12, but everything is faster than the current implementation.
I still need to do a bit of Core-digging to see if I can fix the
regressions vs. 6.12.
Patch should be ready tomorrow or Wednesday.
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2271#comment:14>
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