/**
* generate the switch code for 1 data item given the list of destinations we do not want to
* duplicate items until neccessary, so we have to keep track of all the routes and then generate
* the switch code this way we can route multiple dests per route instruction
*/
protected void generateSwitchCode(FlatNode fire, List<FlatNode> dests) {
assert !(layout.getIdentities().contains(fire));
// should only have one previous
HashMap<ComputeNode, ComputeNode> prev = new HashMap<ComputeNode, ComputeNode>();
HashMap<ComputeNode, HashSet> next = new HashMap<ComputeNode, HashSet>();
ListIterator<FlatNode> destsIt = dests.listIterator();
while (destsIt.hasNext()) {
FlatNode dest = destsIt.next();
assert dest != null;
assert !(layout.getIdentities().contains(dest));
// System.out.println(" Dest: " + dest + " " + layout.getTile(dest));
ComputeNode[] hops =
layout
.router
.getRoute(ssg, layout.getComputeNode(fire), layout.getComputeNode(dest))
.toArray(new ComputeNode[0]);
assert hops.length > 1
: "Error: Bad Layout (could not find route from "
+ fire.toString()
+ " -> "
+ dest.toString();
// for (int i = 0; i < hops.length; i++)
// System.out.println(" " + hops[i]);
// add to fire's next
if (!next.containsKey(layout.getComputeNode(fire)))
next.put(layout.getComputeNode(fire), new HashSet());
next.get(layout.getComputeNode(fire)).add(hops[1]);
// add to all other previous, next
for (int i = 1; i < hops.length - 1; i++) {
if (prev.containsKey(hops[i]))
if (prev.get(hops[i]) != hops[i - 1])
Utils.fail("More than one previous tile for a single data item");
prev.put(hops[i], hops[i - 1]);
if (!next.containsKey(hops[i])) next.put(hops[i], new HashSet());
next.get(hops[i]).add(hops[i + 1]);
}
// add the last step, plus the dest to the dest map
if (prev.containsKey(hops[hops.length - 1]))
if (prev.get(hops[hops.length - 1]) != hops[hops.length - 2])
Utils.fail("More than one previous tile for a single data item (2)");
prev.put(hops[hops.length - 1], hops[hops.length - 2]);
if (!next.containsKey(hops[hops.length - 1])) next.put(hops[hops.length - 1], new HashSet());
next.get(hops[hops.length - 1]).add(hops[hops.length - 1]);
}
// create the appropriate amount of routing instructions
int elements = Util.getTypeSize(CommonUtils.getOutputType(fire));
for (int i = 0; i < elements; i++) asm(layout.getComputeNode(fire), prev, next);
}
// remove all tiles mapped to joiners from the coordinate hashset *tiles*
private static void removeJoiners(HashSet<ComputeNode> tiles) {
Iterator<FlatNode> it = layout.getJoiners().iterator();
while (it.hasNext()) {
tiles.remove(layout.getTile(it.next()));
}
}