[ET Trac] [Einstein Toolkit] #387: Fortran interface to LoopControl broken in stable Carpet

[Einstein Toolkit]

#387: Fortran interface to LoopControl broken in stable Carpet
---------------------+------------------------------------------------------
  Reporter:  rhaas   |       Owner:  rhaas     
      Type:  defect  |      Status:  review    
  Priority:  major   |   Milestone:  ET_2011_05
 Component:  Carpet  |     Version:            
Resolution:          |    Keywords:            
---------------------+------------------------------------------------------

Comment (by rhaas):

 I applied th patch to the stable version. It does not apply cleanly to the
 Mercurial version (some things are apparently handled differently). I
 tried to understand what the Hg version of loopcontrol.h does, but do not
 understand the following lines (numbers are line numbers, the file is
 loopcontrol.h)

 {{{#!C
 256:        int const lc_di = (di_);
 \
 /*...*/
 291:                    int const lc_ipos =
 \
 292:                      lc_imin + lc_lc.ilsh * (j + lc_lc.jlsh * k);
 \
 293:                    int const lc_ioffset = (lc_ipos & - lc_di) -
 lc_ipos;   \
 }}}

 I am not sure what "(lc_ipos & - lc_di)" does (nor does gcc here seem to
 accept this construct [with our without -std=c99]). Any help would be
 welcome.

-- 
Ticket URL: <https://trac.einsteintoolkit.org/ticket/387#comment:3>
Einstein Toolkit <http://einsteintoolkit.org>
The Einstein Toolkit