[MPI3 Fortran] Request for a straw vote.

[Jim Xia]

mpi3-fortran-bounces at lists.mpi-forum.org wrote on 06/12/2009 12:52:00 PM:


> 
> However, there was an earlier discussion raised by Jim about how a 
> compiler might want to copy-in/copy-out even if for assumed-shape 
> arrays.  I think Jim's example had to do with copying vector sized 
> objects even though the user is only using a portion of a vector.
> 
> So does DIMENSION(..) restrict copy-in/copy-out?


I don't remember I raised discussion on this very topic, but this is a 
valid argument.  In short, DIMENSION(..) alone will not restrict 
copy-in/copy-out.  The most effective way to suppress copying is through 
VOLATILE/ASYNCHRONOUS attribute on the dummy argument.

Thanks

Jim Xia

XL Fortran Compiler Test
IBM Toronto Lab at 8200 Warden Ave, Markham, On, L6G 1C7
Phone (905) 413-3444  Tie-line 313-3444
email: jimxia at ca.ibm.com
D2/YF7/8200 /MKM

http://www.ibm.com/software/awdtools/fortran/xlfortran
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