[Boost-bugs] [Boost C++ Libraries] #12580: cpp_bin_float: Bad rounding in corner case of subtraction

Subject: [Boost-bugs] [Boost C++ Libraries] #12580: cpp_bin_float: Bad rounding in corner case of subtraction
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2016-11-04 00:41:46

#12580: cpp_bin_float: Bad rounding in corner case of subtraction
------------------------------+----------------------------
 Reporter:  Michael Shatz     |      Owner:  johnmaddock
     Type:  Bugs              |     Status:  new
Milestone:  To Be Determined  |  Component:  multiprecision
  Version:  Boost 1.62.0      |   Severity:  Problem
 Keywords:                    |
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 Subtraction produces incorrectly rounded result when a small number in
 range (ULP*0.5..ULP*1.0) subtracted from integer power of 2.
 The correct answer should be (original number - ULP), but boost returns
 unmodified original number.

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Ticket URL: <https://svn.boost.org/trac/boost/ticket/12580>
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