Move all smpi colls to cpp.

[simgrid.git] / src / smpi / colls / reduce-binomial.cpp

diff --git a/src/smpi/colls/reduce-binomial.cpp b/src/smpi/colls/reduce-binomial.cpp
new file mode 100644 (file)
index 0000000..180a07d
--- /dev/null
+++ b/src/smpi/colls/reduce-binomial.cpp
@@ -0,0 +1,93 @@
+/* Copyright (c) 2013-2014. The SimGrid Team.
+ * All rights reserved.                                                     */
+
+/* This program is free software; you can redistribute it and/or modify it
+ * under the terms of the license (GNU LGPL) which comes with this package. */
+
+#include "colls_private.h"
+
+//#include <star-reduction.c>
+
+int smpi_coll_tuned_reduce_binomial(void *sendbuf, void *recvbuf, int count,
+                                    MPI_Datatype datatype, MPI_Op op, int root,
+                                    MPI_Comm comm)
+{
+  MPI_Status status;
+  int comm_size, rank;
+  int mask, relrank, source;
+  int dst;
+  int tag = COLL_TAG_REDUCE;
+  MPI_Aint extent;
+  void *tmp_buf;
+  MPI_Aint true_lb, true_extent;
+  if (count == 0)
+    return 0;
+  rank = smpi_comm_rank(comm);
+  comm_size = smpi_comm_size(comm);
+
+  extent = smpi_datatype_get_extent(datatype);
+
+  tmp_buf = (void *) smpi_get_tmp_sendbuffer(count * extent);
+  int is_commutative = smpi_op_is_commute(op);
+  mask = 1;
+  
+  int lroot;
+  if (is_commutative) 
+        lroot   = root;
+  else
+        lroot   = 0;
+  relrank = (rank - lroot + comm_size) % comm_size;
+
+  smpi_datatype_extent(datatype, &true_lb, &true_extent);
+
+  /* adjust for potential negative lower bound in datatype */
+  tmp_buf = (void *)((char*)tmp_buf - true_lb);
+    
+  /* If I'm not the root, then my recvbuf may not be valid, therefore
+     I have to allocate a temporary one */
+  if (rank != root) {
+      recvbuf = (void *) smpi_get_tmp_recvbuffer(count*(MAX(extent,true_extent)));
+      recvbuf = (void *)((char*)recvbuf - true_lb);
+  }
+   if ((rank != root) || (sendbuf != MPI_IN_PLACE)) {
+      smpi_datatype_copy(sendbuf, count, datatype, recvbuf,count, datatype);
+  }
+
+  while (mask < comm_size) {
+    /* Receive */
+    if ((mask & relrank) == 0) {
+      source = (relrank | mask);
+      if (source < comm_size) {
+        source = (source + lroot) % comm_size;
+        smpi_mpi_recv(tmp_buf, count, datatype, source, tag, comm, &status);
+        
+        if (is_commutative) {
+          smpi_op_apply(op, tmp_buf, recvbuf, &count, &datatype);
+        } else {
+          smpi_op_apply(op, recvbuf, tmp_buf, &count, &datatype);
+          smpi_datatype_copy(tmp_buf, count, datatype,recvbuf, count, datatype);
+        }
+      }
+    } else {
+      dst = ((relrank & (~mask)) + lroot) % comm_size;
+      smpi_mpi_send(recvbuf, count, datatype, dst, tag, comm);
+      break;
+    }
+    mask <<= 1;
+  }
+
+  if (!is_commutative && (root != 0)){
+    if (rank == 0){
+      smpi_mpi_send(recvbuf, count, datatype, root,tag, comm);
+    }else if (rank == root){
+      smpi_mpi_recv(recvbuf, count, datatype, 0, tag, comm, &status);
+    }
+  }
+
+  if (rank != root) {
+         smpi_free_tmp_buffer(recvbuf);
+  }
+  smpi_free_tmp_buffer(tmp_buf);
+
+  return 0;
+}