opal/ddt: use optimized description when packing contiguous datatypes

Signed-off-by: Gilles Gouaillardet <gilles@rist.or.jp>

opal/datatype/opal_convertor.c

@@ -481,7 +481,9 @@ size_t opal_convertor_compute_remote_size( opal_convertor_t* pConvertor )
     pConvertor->remote_size = pConvertor->local_size;
     if( OPAL_UNLIKELY(datatype->bdt_used & pConvertor->master->hetero_mask) ) {
         pConvertor->flags &= (~CONVERTOR_HOMOGENEOUS);
-        pConvertor->use_desc = &(datatype->desc);
+        if (!(pConvertor->flags & CONVERTOR_SEND && pConvertor->flags & OPAL_DATATYPE_FLAG_CONTIGUOUS)) {
+            pConvertor->use_desc = &(datatype->desc);
+        }
         if( 0 == (pConvertor->flags & CONVERTOR_HAS_REMOTE_SIZE) ) {
             /* This is for a single datatype, we must update it with the count */
             pConvertor->remote_size = opal_datatype_compute_remote_size(datatype,
@@ -570,6 +572,7 @@ int32_t opal_convertor_prepare_for_recv( opal_convertor_t* convertor,
     mca_cuda_convertor_init(convertor, pUserBuf);
 #endif
 
+    assert(! (convertor->flags & CONVERTOR_SEND));
     OPAL_CONVERTOR_PREPARE( convertor, datatype, count, pUserBuf );
 
     if( convertor->flags & CONVERTOR_WITH_CHECKSUM ) {

opal/datatype/opal_convertor.h

@@ -218,6 +218,7 @@ static inline void opal_convertor_get_unpacked_size( const opal_convertor_t* pCo
         return;
     }
     if( 0 == (CONVERTOR_HAS_REMOTE_SIZE & pConv->flags) ) {
+        assert(! (pConv->flags & CONVERTOR_SEND));
         opal_convertor_compute_remote_size( (opal_convertor_t*)pConv);
     }
     *pSize = pConv->remote_size;

opal/datatype/opal_datatype_fake_stack.c

@@ -91,6 +91,7 @@ int opal_convertor_create_stack_with_pos_general( opal_convertor_t* pConvertor,
     }
 
     /* remove from the main loop all the complete datatypes */
+    assert (! (pConvertor->flags & CONVERTOR_SEND));
     remote_size    = opal_convertor_compute_remote_size( pConvertor );
     count          = (int32_t)(starting_point / remote_size);
     resting_place -= (remote_size * count);