Correct the disp array when creating a data based on the

MPI_COMBINER_INDEXED_BLOCK combiner.

This commit was SVN r20123.

ompi/datatype/convertor.h

@@ -159,10 +159,12 @@ static inline int ompi_convertor_cleanup( ompi_convertor_t* convertor )
 }
 
 /*
- * Return:   0 if data is nor required to be packed for sending
- *           1 if data does need to be packed (src and destination are
- *             heterogenous from a data perspective, or data is not
- *             contigous.
+ * Return:   0 if no packing is required for sending (the upper layer
+ *             can use directly the pointer to the contiguous user
+ *             buffer).
+ *           1 if data does need to be packed, i.e. heterogeneous peers
+ *             (source arch != dest arch) or non contiguous memory
+ *             layout.
  */
 static inline int32_t
 ompi_convertor_need_buffers( const ompi_convertor_t* pConvertor )

ompi/datatype/dt_args.c

@@ -657,7 +657,7 @@ __ompi_ddt_create_from_args( int32_t* i, MPI_Aint* a,
         break;
         /******************************************************************/
     case MPI_COMBINER_INDEXED_BLOCK:
-        ompi_ddt_create_indexed_block( i[0], i[1], &(i[1+i[0]]), d[0], &datatype );
+        ompi_ddt_create_indexed_block( i[0], i[1], &(i[2]), d[0], &datatype );
         break;
         /******************************************************************/
     case MPI_COMBINER_STRUCT_INTEGER: