#4383: Uncanonical display of Double
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Reporter: daniel.is.fischer | Owner:
Type: bug | Status: merge
Priority: high | Milestone: 7.0.2
Component: libraries/base | Version: 6.12.3
Keywords: Double, show | Testcase:
Blockedby: | Difficulty:
Os: Unknown/Multiple | Blocking:
Architecture: Unknown/Multiple | Failure: Incorrect result at runtime
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Changes (by simonmar):
* status: patch => merge
Comment:
I pushed all these to HEAD. We want these two in 7.0.2:
{{{
Sun Oct 24 11:29:42 PDT 2010 Daniel Fischer <[email protected]>
* FIX #4383
Use a better approximation to logBase 10 2 to prevent leading zeros in
floatToDigits.
Sun Oct 24 19:50:41 BST 2010 Daniel Fischer <[email protected]>
* Fix typo in floatToDigits
The mDn value for powers of 2 >= floatDigits x - 1 was typo'ed, leading
to longer than necessary show results in a few cases (e.g. 2.0^852).
Corrected in accordance with Burger and Dybvig's paper.
}}}
and these two should stay in HEAD only:
{{{
Sun Oct 24 20:07:07 BST 2010 Daniel Fischer <[email protected]>
* Cache for powers of 10
Add a cache for commonly needed powers of 10 to speed up floatToDigits.
Sun Oct 24 19:59:14 BST 2010 Daniel Fischer <[email protected]>
* Performance enchancement for floatToDigits
Use quot and quotRem instead of div and divMod for dividing positive
Integers since that is a bit faster.
}}}
--
Ticket URL: <http://hackage.haskell.org/trac/ghc/ticket/4383#comment:5>
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