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Don't fill array with garbage when it won't be needed. Thanks agier (and ubsan).
[simgrid.git] / src / smpi / bindings / smpi_f77_coll.cpp
index 64f89dd..761ed29 100644 (file)
@@ -120,13 +120,14 @@ void mpi_reduce_scatter_block_ (void *sendbuf, void *recvbuf, int* recvcount, in
 void mpi_alltoallw_ ( void *sendbuf, int *sendcnts, int *sdispls, int* old_sendtypes, void *recvbuf, int *recvcnts,
                       int *rdispls, int* old_recvtypes, int* comm, int* ierr){
   int size = simgrid::smpi::Comm::f2c(*comm)->size();
-  sendbuf = static_cast<char *>( FORT_IN_PLACE(sendbuf));
   MPI_Datatype* sendtypes = new MPI_Datatype[size];
   MPI_Datatype* recvtypes = new MPI_Datatype[size];
   for(int i=0; i< size; i++){
-    sendtypes[i] = simgrid::smpi::Datatype::f2c(old_sendtypes[i]);
+    if(FORT_IN_PLACE(sendbuf)!=MPI_IN_PLACE)
+      sendtypes[i] = simgrid::smpi::Datatype::f2c(old_sendtypes[i]);
     recvtypes[i] = simgrid::smpi::Datatype::f2c(old_recvtypes[i]);
   }
+  sendbuf = static_cast<char *>( FORT_IN_PLACE(sendbuf));
  *ierr = MPI_Alltoallw( sendbuf, sendcnts, sdispls, sendtypes, recvbuf, recvcnts, rdispls,
                         recvtypes, simgrid::smpi::Comm::f2c(*comm));
   delete[] sendtypes;
@@ -301,13 +302,14 @@ void mpi_ialltoallw_ ( void *sendbuf, int *sendcnts, int *sdispls, int* old_send
                       int *rdispls, int* old_recvtypes, int* comm, int* request, int* ierr){
   MPI_Request req;
   int size = simgrid::smpi::Comm::f2c(*comm)->size();
-  sendbuf = static_cast<char *>( FORT_IN_PLACE(sendbuf));
   MPI_Datatype* sendtypes = new MPI_Datatype[size];
   MPI_Datatype* recvtypes = new MPI_Datatype[size];
   for(int i=0; i< size; i++){
-    sendtypes[i] = simgrid::smpi::Datatype::f2c(old_sendtypes[i]);
+    if(FORT_IN_PLACE(sendbuf)!=MPI_IN_PLACE)
+      sendtypes[i] = simgrid::smpi::Datatype::f2c(old_sendtypes[i]);
     recvtypes[i] = simgrid::smpi::Datatype::f2c(old_recvtypes[i]);
   }
+  sendbuf = static_cast<char *>( FORT_IN_PLACE(sendbuf));
  *ierr = MPI_Ialltoallw( sendbuf, sendcnts, sdispls, sendtypes, recvbuf, recvcnts, rdispls,
                         recvtypes, simgrid::smpi::Comm::f2c(*comm), &req);
   if(*ierr == MPI_SUCCESS) {