#2271: floor, ceiling, round :: Double -> Int are awesomely slow
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Reporter: dons | Owner: daniel.is.fischer
Type: bug | Status: patch
Priority: low | Milestone: 7.0.1
Component: libraries/base | Version: 7.1
Keywords: performance, math, double | Testcase:
Blockedby: | Difficulty: Unknown
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: None/Unknown
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Comment(by daniel.is.fischer):
!QuickCheck doesn't know about the new !SplittableGen class in
System.Random yet, so split is not in scope in a couple of modules.
Good catch, the `-0.0`. I mimicked `rint[f]`'s behaviour, didn't think
about that. Easy change. We don't have good support for `-0.0` in any
conversion functions anyway.
I was referring to what happens with out-of-range values in arith005,
though. `double2Int` and `float2Int` return minBound for those. You can't
see that in the tests because there are no values outside 64-bit int range
there, only outside 32-bit range :)
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/2271#comment:28>
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