Improve performance of Fortran index calculations

In Fortran, Cactus currently declares grid functions e.g. as (this is
the expansion of DECLARE_CCTK_ARGUMENTS)

   REAL*8 gxx (X0metric,X1metric,X2metric)

where X0metric etc. are integers passed into the routine. Each grid
function group has its own, independent size. This has two
disadvantages:

- The compiler does not know that all grid functions have the same
  size (namely cctk_lsh), and thus has to perform array index
  calculations separately for each group
- The argument list is longer than neded

The enclosed patch declares grid functions via cctk_lsh. Grid arrays
are still declared independently.

This reduces the code size of e.g. GRHydro/GRHydro_Tmunu.F90 from 6836
to 6241 bytes on my system. I have not attempted to measure a
performance difference.


git-svn-id: http://svn.cactuscode.org/flesh/trunk@4763 17b73243-c579-4c4c-a9d2-2d5706c11dac

0 files changed, 0 insertions, 0 deletions