Re: [Boost-bugs] [Boost C++ Libraries] #9233: Suboptimal shift by multiples of 8 bits

Subject: Re: [Boost-bugs] [Boost C++ Libraries] #9233: Suboptimal shift by multiples of 8 bits
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2016-02-24 19:02:05

#9233: Suboptimal shift by multiples of 8 bits
-------------------------------+----------------------------
  Reporter:  psiha             |      Owner:  johnmaddock
      Type:  Bugs              |     Status:  closed
 Milestone:  To Be Determined  |  Component:  multiprecision
   Version:  Boost 1.54.0      |   Severity:  Optimization
Resolution:  wontfix           |   Keywords:
-------------------------------+----------------------------

Comment (by johnmaddock):

 Fixed in
 https://github.com/boostorg/multiprecision/commit/cb1a41835f4566987b96c7a7034088e22d83f77b


 It turns out that memmove is (very slightly) faster than moving whole
 limbs so that's the preferred method when available.

 Limbs are half the size of the largest available integers - so 32-bit for
 msvc as there's no 128-bit integer support (unlike mingw for example).

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/9233#comment:3>
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