Add support for MPI_IN_PLACE for the easy operations.

This commit was SVN r7344.

ompi/mca/coll/basic/coll_basic_allgather.c

@@ -48,8 +48,9 @@ mca_coll_basic_allgather_intra(void *sbuf, int scount,
 
     err = comm->c_coll.coll_gather(sbuf, scount, sdtype, rbuf, rcount,
                                    rdtype, 0, comm);
-    if (MPI_SUCCESS != err)
+    if (MPI_SUCCESS != err) {
         return err;
+    }
 
     err = comm->c_coll.coll_bcast(rbuf, rcount * size, rdtype, 0, comm);
     return err;

ompi/mca/coll/basic/coll_basic_gather.c

@@ -71,8 +71,10 @@ mca_coll_basic_gather_intra(void *sbuf, int scount,
         /* simple optimization */
 
         if (i == rank) {
+            if (MPI_IN_PLACE != sbuf) {
                 err = ompi_ddt_sndrcv(sbuf, scount, sdtype, ptmp,
                                       rcount, rdtype);
+            }
         } else {
             err = MCA_PML_CALL(recv(ptmp, rcount, rdtype, i,
                                     MCA_COLL_BASE_TAG_GATHER,

ompi/mca/coll/basic/coll_basic_gatherv.c

@@ -76,9 +76,10 @@ mca_coll_basic_gatherv_intra(void *sbuf, int scount,
 
         if (i == rank) {
             /* simple optimization */
-            if ((0 < scount) && (0 < rcounts[i]))
+            if (MPI_IN_PLACE != sbuf && (0 < scount) && (0 < rcounts[i])) {
                 err = ompi_ddt_sndrcv(sbuf, scount, sdtype,
                                       ptmp, rcounts[i], rdtype);
+            }
         } else {
             /* Only receive if there is something to receive */
             if (rcounts[i] > 0) {

ompi/mca/coll/basic/coll_basic_scatter.c

@@ -75,9 +75,11 @@ mca_coll_basic_scatter_intra(void *sbuf, int scount,
         /* simple optimization */
 
         if (i == rank) {
+            if (MPI_IN_PLACE != recvbuf) {
                 err =
                     ompi_ddt_sndrcv(ptmp, scount, sdtype, rbuf, rcount,
                                     rdtype);
+            }
         } else {
             err = MCA_PML_CALL(send(ptmp, scount, sdtype, i,
                                     MCA_COLL_BASE_TAG_SCATTER,

ompi/mca/coll/basic/coll_basic_scatterv.c

@@ -79,11 +79,10 @@ mca_coll_basic_scatterv_intra(void *sbuf, int *scounts,
 
         if (i == rank) {
             /* simple optimization or a local operation */
-            if (0 == scounts[i]) {
-                continue;
-            }
+            if (scounts[i] > 0 && MPI_IN_PLACE != rbuf) {
                 err = ompi_ddt_sndrcv(ptmp, scounts[i], sdtype, rbuf, rcount,
                                       rdtype);
+            }
         } else {
             /* Only send if there is something to send */
             if (scounts[i] > 0) {