[Boost-bugs] [Boost C++ Libraries] #6101: overhead with creating multi_array_ref with GCC 3.4.6

Subject: [Boost-bugs] [Boost C++ Libraries] #6101: overhead with creating multi_array_ref with GCC 3.4.6
From: Boost C++ Libraries (noreply_at_[hidden])
Date: 2011-11-07 08:53:10

#6101: overhead with creating multi_array_ref with GCC 3.4.6
------------------------------------------------------+---------------------
 Reporter:  Maxim Yanchenko <Maxim.Yanchenko@…>       |       Owner:  garcia      
     Type:  Bugs                                      |      Status:  new         
Milestone:  To Be Determined                          |   Component:  multi_array 
  Version:  Boost 1.47.0                              |    Severity:  Optimization
 Keywords:                                            |  
------------------------------------------------------+---------------------
 We spotted this with profiler and had to switch from
 boost::const_multi_array_ref to just std:pair of pointers.

 GCC 3.4.6 generates huge code for this primitive function (to represent a
 raw pointer as a 1D-array), comparing to GCC 4.4.4:
 {{{
 boost::const_multi_array_ref<int,1>
 make(const int* begin, const boost::array<int,1>& size)
 {
   return boost::const_multi_array_ref<int,1>(begin, size);
 }
 }}}

 The generated code and compilation options are attached.

-- 
Ticket URL: <https://svn.boost.org/trac/boost/ticket/6101>
Boost C++ Libraries <http://www.boost.org/>
Boost provides free peer-reviewed portable C++ source libraries.