Remove the code handling zero count cases in ADAPT.

Set request in ibcast.c to empty when the count is 0.

Signed-off-by: Xi Luo <xluo12@vols.utk.edu>
Signed-off-by: George Bosilca <bosilca@icl.utk.edu>

ompi/mca/coll/adapt/coll_adapt_bcast.c

@@ -15,9 +15,6 @@
 int ompi_coll_adapt_bcast(void *buff, int count, struct ompi_datatype_t *datatype, int root,
                          struct ompi_communicator_t *comm, mca_coll_base_module_t * module)
 {
-    if (count == 0) {
-        return MPI_SUCCESS;
-    }
     ompi_request_t *request = NULL;
     int err = ompi_coll_adapt_ibcast(buff, count, datatype, root, comm, &request, module);
     if( MPI_SUCCESS != err ) {

ompi/mca/coll/adapt/coll_adapt_ibcast.c

@@ -329,21 +329,6 @@ int ompi_coll_adapt_ibcast(void *buff, int count, struct ompi_datatype_t *dataty
                           struct ompi_communicator_t *comm, ompi_request_t ** request,
                           mca_coll_base_module_t * module)
 {
-    if (0 == count) {
-        ompi_request_t *temp_request = OBJ_NEW(ompi_request_t);
-        OMPI_REQUEST_INIT(temp_request, false);
-        temp_request->req_type = 0;
-        temp_request->req_free = ompi_coll_adapt_request_free;
-        temp_request->req_status.MPI_SOURCE = 0;
-        temp_request->req_status.MPI_TAG = 0;
-        temp_request->req_status.MPI_ERROR = 0;
-        temp_request->req_status._cancelled = 0;
-        temp_request->req_status._ucount = 0;
-        ompi_request_complete(temp_request, 1);
-        *request = temp_request;
-        return MPI_SUCCESS;
-    }
-
     OPAL_OUTPUT_VERBOSE((10, mca_coll_adapt_component.adapt_output,
                          "ibcast root %d, algorithm %d, coll_adapt_ibcast_segment_size %zu, coll_adapt_ibcast_max_send_requests %d, coll_adapt_ibcast_max_recv_requests %d\n",
                          root, mca_coll_adapt_component.adapt_ibcast_algorithm,

ompi/mca/coll/adapt/coll_adapt_ireduce.c

@@ -521,10 +521,6 @@ int ompi_coll_adapt_ireduce(const void *sbuf, void *rbuf, int count, struct ompi
                            struct ompi_op_t *op, int root, struct ompi_communicator_t *comm,
                            ompi_request_t ** request, mca_coll_base_module_t * module)
 {
-    if (count == 0) {
-        return MPI_SUCCESS;
-    }
-
     OPAL_OUTPUT_VERBOSE((10, mca_coll_adapt_component.adapt_output,
                          "ireduce root %d, algorithm %d, coll_adapt_ireduce_segment_size %zu, coll_adapt_ireduce_max_send_requests %d, coll_adapt_ireduce_max_recv_requests %d\n",
                          root, mca_coll_adapt_component.adapt_ireduce_algorithm,

ompi/mca/coll/adapt/coll_adapt_reduce.c

@@ -17,9 +17,6 @@ int ompi_coll_adapt_reduce(const void *sbuf, void *rbuf, int count, struct ompi_
                           struct ompi_op_t *op, int root, struct ompi_communicator_t *comm,
                           mca_coll_base_module_t * module)
 {
-    if (count == 0) {
-        return MPI_SUCCESS;
-    }
     ompi_request_t *request = NULL;
     int err = ompi_coll_adapt_ireduce(sbuf, rbuf, count, dtype, op, root, comm, &request, module);
     if( MPI_SUCCESS != err ) {

ompi/mpi/c/ibcast.c

@@ -100,6 +100,7 @@ int MPI_Ibcast(void *buffer, int count, MPI_Datatype datatype,
 
     if ((OMPI_COMM_IS_INTRA(comm) && ompi_comm_size(comm) <= 1) ||
         0 == count) {
+        *request = &ompi_request_empty;
         return MPI_SUCCESS;
     }