Subject: Re: [Boost-bugs] [Boost C++ Libraries] #9233: Suboptimal shift by multiples of 8 bits
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2016-02-18 11:36:34
#9233: Suboptimal shift by multiples of 8 bits
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Reporter: psiha | Owner: johnmaddock
Type: Bugs | Status: closed
Milestone: To Be Determined | Component: multiprecision
Version: Boost 1.54.0 | Severity: Optimization
Resolution: wontfix | Keywords:
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Comment (by psiha):
Maybe you could add/separate specialized functions for shifting: for whole
limbs, for whole bytes and 'generic'. Then the shift operator can be
implemented as
if ( bits % limb_bits == 0 ) shift_limbs();
elseif ( bits % 8 == 0 ) shift_bytes();
else { generic() };
and rely on IPO to directly select the optimal implementation when bits is
a compile time constant...
-- Ticket URL: <https://svn.boost.org/trac/boost/ticket/9233#comment:2> Boost C++ Libraries <http://www.boost.org/> Boost provides free peer-reviewed portable C++ source libraries.
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