Subject: Re: [Boost-bugs] [Boost C++ Libraries] #12527: cpp_bin_float: Anal fixation. Part 3. Double rounding when result of convert_to<double>() is a subnormal
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2016-11-17 11:31:22
#12527: cpp_bin_float: Anal fixation. Part 3. Double rounding when result of
convert_to<double>() is a subnormal
-------------------------------+----------------------------
Reporter: Michael Shatz | Owner: johnmaddock
Type: Bugs | Status: reopened
Milestone: To Be Determined | Component: multiprecision
Version: Boost 1.62.0 | Severity: Problem
Resolution: | Keywords:
-------------------------------+----------------------------
Comment (by Michael Shatz):
Thank you
Unfortunately, tonight I have more important things to do. Like watching
Carlsen vs Karjakin ;-)
Most likely, I wouldn't test it until Saturday night.
Sorry
P.S.
Variant in comment 15 is non-trivially faster than comment 14. Especially
for cpp_bin_float_100.
But yes, even without measurement I can believe that using low-level
cpp_bin_float primitives can be faster than using relatively high-level
eval_convert_to(uint64_t*, cpp_bin_float*).
On the other hand, if the difference (aginst variant in comment 15) is as
significant as you suggest, it means that eval_convert_to(uint64_t*,
cpp_bin_float*) is undertuned.
-- Ticket URL: <https://svn.boost.org/trac/boost/ticket/12527#comment:19> Boost C++ Libraries <http://www.boost.org/> Boost provides free peer-reviewed portable C++ source libraries.
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