munich-quantum-toolkit · burgholzer · Mar 9, 2026 · Feb 20, 2026 · Feb 21, 2026 · Feb 26, 2026
diff --git a/mlir/include/mlir/CMakeLists.txt b/mlir/include/mlir/CMakeLists.txt
@@ -6,5 +6,6 @@
 #
 # Licensed under the MIT License
 
-add_subdirectory(Dialect)
 add_subdirectory(Conversion)
+add_subdirectory(Dialect)
+add_subdirectory(Passes)
diff --git a/mlir/include/mlir/Passes/CMakeLists.txt b/mlir/include/mlir/Passes/CMakeLists.txt
@@ -0,0 +1,12 @@
+# Copyright (c) 2023 - 2026 Chair for Design Automation, TUM
+# Copyright (c) 2025 - 2026 Munich Quantum Software Company GmbH
+# All rights reserved.
+#
+# SPDX-License-Identifier: MIT
+#
+# Licensed under the MIT License
+
+set(LLVM_TARGET_DEFINITIONS Passes.td)
+mlir_tablegen(Passes.h.inc -gen-pass-decls -name QCO)
+add_public_tablegen_target(QcoPassesIncGen)
+add_mlir_doc(Passes QcoPasses Passes/ -gen-pass-doc)
diff --git a/mlir/include/mlir/Passes/Passes.h b/mlir/include/mlir/Passes/Passes.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2023 - 2026 Chair for Design Automation, TUM
+ * Copyright (c) 2025 - 2026 Munich Quantum Software Company GmbH
+ * All rights reserved.
+ *
+ * SPDX-License-Identifier: MIT
+ *
+ * Licensed under the MIT License
+ */
+
+#pragma once
+
+#include "mlir/Dialect/QCO/IR/QCODialect.h"
+
+#include <mlir/Dialect/Arith/IR/Arith.h>
+#include <mlir/Pass/Pass.h>
+#include <mlir/Pass/PassRegistry.h>
+
+namespace mlir::qco {
+
+#define GEN_PASS_DECL
+#include "mlir/Passes/Passes.h.inc" // IWYU pragma: export
+
+//===----------------------------------------------------------------------===//
+// Registration
+//===----------------------------------------------------------------------===//
+
+/// Generate the code for registering passes.
+#define GEN_PASS_REGISTRATION
+#include "mlir/Passes/Passes.h.inc" // IWYU pragma: export
+
+} // namespace mlir::qco
diff --git a/mlir/include/mlir/Passes/Passes.td b/mlir/include/mlir/Passes/Passes.td
@@ -0,0 +1,26 @@
+// Copyright (c) 2023 - 2026 Chair for Design Automation, TUM
+// Copyright (c) 2025 - 2026 Munich Quantum Software Company GmbH
+// All rights reserved.
+//
+// SPDX-License-Identifier: MIT
+//
+// Licensed under the MIT License
+
+#ifndef QCO_PASSES
+#define QCO_PASSES
+
+include "mlir/Pass/PassBase.td"
+
+//===----------------------------------------------------------------------===//
+// Transpilation Passes
+//===----------------------------------------------------------------------===//
+
+def HeuristicMappingPass : Pass<"map", "mlir::ModuleOp"> {
+  let dependentDialects = ["mlir::qco::QCODialect"];
+  let summary = "This pass ensures that a program meets the connectivity constraints of a given architecture.";
+  let description = [{
+    This pass inserts SWAP operations to ensure two-qubit gates are executable on a given target architecture.
+  }];
+}
+
+#endif // QCO_PASSES
diff --git a/mlir/lib/CMakeLists.txt b/mlir/lib/CMakeLists.txt
@@ -6,7 +6,8 @@
 #
 # Licensed under the MIT License
 
-add_subdirectory(Dialect)
 add_subdirectory(Conversion)
 add_subdirectory(Compiler)
+add_subdirectory(Dialect)
+add_subdirectory(Passes)
 add_subdirectory(Support)
diff --git a/mlir/lib/Compiler/CMakeLists.txt b/mlir/lib/Compiler/CMakeLists.txt
@@ -20,6 +20,7 @@ add_mlir_library(
   QCToQCO
   QCOToQC
   QCToQIR
+  QcoPasses
   MQT::MLIRSupport
   DISABLE_INSTALL)
 

diff --git a/mlir/lib/Compiler/CompilerPipeline.cpp b/mlir/lib/Compiler/CompilerPipeline.cpp
@@ -13,6 +13,7 @@
 #include "mlir/Conversion/QCOToQC/QCOToQC.h"
 #include "mlir/Conversion/QCToQCO/QCToQCO.h"
 #include "mlir/Conversion/QCToQIR/QCToQIR.h"
+#include "mlir/Passes/Passes.h"
 #include "mlir/Support/PrettyPrinting.h"
 
 #include <llvm/ADT/StringRef.h>
@@ -147,7 +148,8 @@ QuantumCompilerPipeline::runPipeline(ModuleOp module,
 
   // Stage 5: Optimization passes
   // TODO: Add optimization passes
-  addCleanupPasses(pm);
+  pm.addPass(qco::createHeuristicMappingPass());
+  // addCleanupPasses(pm);
   if (failed(pm.run(module))) {
     return failure();
   }

diff --git a/mlir/lib/Passes/CMakeLists.txt b/mlir/lib/Passes/CMakeLists.txt
@@ -0,0 +1,41 @@
+# Copyright (c) 2023 - 2026 Chair for Design Automation, TUM
+# Copyright (c) 2025 - 2026 Munich Quantum Software Company GmbH
+# All rights reserved.
+#
+# SPDX-License-Identifier: MIT
+#
+# Licensed under the MIT License
+
+file(GLOB_RECURSE PASSES_SOURCES *.cpp)
+
+get_property(dialect_libs GLOBAL PROPERTY MLIR_DIALECT_LIBS)
+
+add_mlir_library(
+  QcoPasses
+  ${PASSES_SOURCES}
+  LINK_LIBS
+  PUBLIC
+  PRIVATE
+  ${dialect_libs}
+  DEPENDS
+  QcoPassesIncGen)
+
+# collect header files
+file(GLOB_RECURSE PASSES_HEADERS_SOURCE ${MQT_MLIR_SOURCE_INCLUDE_DIR}/mlir/Passes/*.h)
+file(GLOB_RECURSE PASSES_HEADERS_BUILD ${MQT_MLIR_BUILD_INCLUDE_DIR}/mlir/Passes/*.inc)
+
+# add public headers using file sets
+target_sources(
+  QcoPasses
+  PUBLIC FILE_SET
+         HEADERS
+         BASE_DIRS
+         ${MQT_MLIR_SOURCE_INCLUDE_DIR}
+         FILES
+         ${PASSES_HEADERS_SOURCE}
+         FILE_SET
+         HEADERS
+         BASE_DIRS
+         ${MQT_MLIR_BUILD_INCLUDE_DIR}
+         FILES
+         ${PASSES_HEADERS_BUILD})
-Original file line number
+Diff line change
@@ Expand Up / @@ -20,6 +20,7 @@ add_mlir_library( @@
       QCToQCO
       QCOToQC
       QCToQIR
+      QcoPasses
       MQT::MLIRSupport
       DISABLE_INSTALL)
@@ Expand Down @@