Implement basic version of the SSS pattern for C++ target

An interesting extension of the AA pattern.  The main advantage of this is
that updating pointers in a control structure is  much more elegant than
duplicating all function implementations as is required by the normal AA
pattern. For more details see [1].

Only works for the SOA layout.

On a pure memory access level this pattern is equivalent to the AA pattern.
The difference is how the memory locations are calculated (by pointer swap
& shift or by different indexing functions for odd and even time steps).

[1]: "An auto-vectorization friendly parallel lattice Boltzmann streaming
      scheme for direct addressing" by Mohrhard et al. (2019)

1 files changed, 1 insertions, 1 deletions

diff --git a/boltzgen.py b/boltzgen.py
index 216234f..c2eb297 100755
--- a/boltzgen.py
+++ b/boltzgen.py
@@ -13,7 +13,7 @@ argparser.add_argument('--model',     required = False, help = 'LBM model (curre
 argparser.add_argument('--precision', required = True,  help = 'Floating precision ("single" or "double")')
 argparser.add_argument('--layout',    required = True,  help = 'Memory layout ("AOS" or "SOA")')
 argparser.add_argument('--index',     required = False, help = 'Cell indexing ("XYZ" or "ZYX")')
-argparser.add_argument('--streaming', required = True,  help = 'Streaming pattern ("AB" or "AA")')
+argparser.add_argument('--streaming', required = True,  help = 'Streaming pattern ("AB", "AA" or "SSS")')
 argparser.add_argument('--geometry',  required = True,  help = 'Size of the block geometry ("x:y(:z)")')
 argparser.add_argument('--tau',       required = True,  help = 'BGK relaxation time')