1 files changed, 32 insertions, 0 deletions
diff --git a/backend/include/rcc/CodeGen/PBQP/ReductionRules.h b/backend/include/rcc/CodeGen/PBQP/ReductionRules.h
new file mode 100644
index 0000000..1b28e33
--- /dev/null
+++ b/backend/include/rcc/CodeGen/PBQP/ReductionRules.h
@@ -0,0 +1,32 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef RCC_CODEGEN_PBQP_REDUCTIONRULES_H
+#define RCC_CODEGEN_PBQP_REDUCTIONRULES_H
+
+#include "rcc/CodeGen/PBQP/Graph.h"
+
+#include <cstdint>
+
+namespace rcc::pbqp {
+
+enum class ReductionKind : std::uint8_t {
+  DegreeZero,
+  DegreeOne,
+  DegreeTwo,
+  Heuristic,
+};
+
+struct ReductionRecord final {
+  ReductionKind Kind = ReductionKind::DegreeZero;
+  NodeID Node;
+  NodeID FirstNeighbor;
+  NodeID SecondNeighbor;
+  std::size_t FixedSelection = 0;
+  CostVector NodeCosts{1};
+  CostMatrix FirstCosts{1, 1};
+  CostMatrix SecondCosts{1, 1};
+};
+
+} // namespace rcc::pbqp
+
+#endif // RCC_CODEGEN_PBQP_REDUCTIONRULES_H