minor fix

src/PIM/Dialect/Spatial/Passes/Transforms/MergeComputeNodes/Scheduling/PipelineScheduling.cpp

@@ -841,7 +841,7 @@ static FailureOr<PipelineStageAssignment> assignPipelineStages(
     std::string &error) {
   if (graph.nodes.empty())
     return PipelineStageAssignment {
-      {}, std::vector<size_t>(layout.getStageCount(), 1)};
+      {}, std::vector<size_t>(layout.getStageSizes())};
   std::vector<size_t> tasksByOrder(graph.nodes.size());
   std::iota(tasksByOrder.begin(), tasksByOrder.end(), 0);
   llvm::sort(tasksByOrder, [&](size_t lhs, size_t rhs) {

test/PIM/SpatialSchedulingTargetTest.cpp

@@ -130,6 +130,14 @@ int main() {
     3, 3, 3, 0,
   };
   std::string pipelineError;
+  ComputeGraph emptyGraph;
+  MergeScheduleResult emptySchedule;
+  emptySchedule.processorCount = 2;
+  assert(mlir::succeeded(applyPipelineScheduling(
+    emptyGraph, emptySchedule, 2, physical, pipelineError)));
+  assert(emptySchedule.processorCount == physical.processorCount);
+  assert(emptySchedule.processorStages == std::vector<size_t>({0, 0, 1, 1}));
+
   MergeScheduleResult pipelineSchedule = logicalSchedule;
   assert(mlir::succeeded(applyPipelineScheduling(
     graph, pipelineSchedule, 2, physical, pipelineError)));