From: degomme <augustin.degomme@unibas.ch>
Date: Mon, 31 Oct 2016 08:31:20 +0000 (+0100)
Subject: handle MPI_IN_PLACE for this collective
X-Git-Tag: v3_14~271^2~5
X-Git-Url: http://bilbo.iut-bm.univ-fcomte.fr/pub/gitweb/simgrid.git/commitdiff_plain/75556c3d1492aad51984b9fea657dcde33e44705?hp=6a7a5e668b9652e14a3e48b318743e9f9a0c720e

handle MPI_IN_PLACE for this collective
---

diff --git a/src/smpi/colls/reduce-scatter-gather.c b/src/smpi/colls/reduce-scatter-gather.c
index 98f2a097fa..38db76025b 100644
--- a/src/smpi/colls/reduce-scatter-gather.c
+++ b/src/smpi/colls/reduce-scatter-gather.c
@@ -54,7 +54,7 @@ int smpi_coll_tuned_reduce_scatter_gather(void *sendbuf, void *recvbuf,
     send_ptr = (void *) smpi_get_tmp_sendbuffer(new_count * extent);
     recv_ptr = (void *) smpi_get_tmp_recvbuffer(new_count * extent);
     tmp_buf = (void *) smpi_get_tmp_sendbuffer(new_count * extent);
-    memcpy(send_ptr, sendbuf, extent * count);
+    memcpy(send_ptr, sendbuf != MPI_IN_PLACE ? sendbuf : recvbuf, extent * count);
 
     //if ((rank != root))
     smpi_mpi_sendrecv(send_ptr, new_count, datatype, rank, tag,
@@ -233,7 +233,7 @@ int smpi_coll_tuned_reduce_scatter_gather(void *sendbuf, void *recvbuf,
     tmp_buf = (void *) smpi_get_tmp_sendbuffer(count * extent);
 
     //if ((rank != root))
-    smpi_mpi_sendrecv(sendbuf, count, datatype, rank, tag,
+    smpi_mpi_sendrecv(sendbuf != MPI_IN_PLACE ? sendbuf : recvbuf, count, datatype, rank, tag,
                  recvbuf, count, datatype, rank, tag, comm, &status);
 
     rem = comm_size - pof2;