[Boost-bugs] [Boost C++ Libraries] #6975: lexical_cast<double> produces different answers with 53-bit FPU precision

Subject: [Boost-bugs] [Boost C++ Libraries] #6975: lexical_cast<double> produces different answers with 53-bit FPU precision
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2012-06-08 21:45:11

#6975: lexical_cast<double> produces different answers with 53-bit FPU precision
-----------------------------------------------------------+----------------
 Reporter:  Jonathan Jones <jonathan.jones@…>              |       Owner:  apolukhin   
     Type:  Bugs                                           |      Status:  new         
Milestone:  To Be Determined                               |   Component:  lexical_cast
  Version:  Boost 1.49.0                                   |    Severity:  Problem     
 Keywords:                                                 |  
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 For some subset of floating point strings, if you use
 lexical_cast<double>, it will produce different answers than if you use
 std::atof or reading from std::istringstream.  However, this only happens
 when you use 53 bit FPU precision as opposed to 64 bit.

 A duplication program is attached, which I've only tried on g++/64 bit-
 Intel because of the code modifying the FPU settings.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/6975>
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