1 files changed, 45 insertions, 0 deletions
diff --git a/backend/include/rcc/CodeGen/MachineLICM.h b/backend/include/rcc/CodeGen/MachineLICM.h
new file mode 100644
index 0000000..66b7ef8
--- /dev/null
+++ b/backend/include/rcc/CodeGen/MachineLICM.h
@@ -0,0 +1,45 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef RCC_CODEGEN_MACHINELICM_H
+#define RCC_CODEGEN_MACHINELICM_H
+
+#include "rcc/CodeGen/MachinePass.h"
+
+#include <cstddef>
+#include <cstdint>
+
+namespace rcc {
+
+enum class MachineCodeMotionStage : std::uint8_t {
+  SelectedSSA,
+  PostRegisterAllocation,
+};
+
+struct MachineLICMOptions final {
+  std::size_t MaximumHoistedInstructions = 10'000;
+  std::size_t MaximumHoistedDefinitionsPerLoop = 256;
+};
+
+class MachineLICMPass final : public MachineFunctionPass {
+public:
+  explicit MachineLICMPass(MachineLICMOptions Options = {}) : Options(Options) {}
+  MachineLICMPass(MachineCodeMotionStage Stage, MachineLICMOptions Options = {})
+      : Stage(Stage), Options(Options) {}
+
+  [[nodiscard]] const MachinePassContract &contract() const noexcept override;
+  [[nodiscard]] Expected<MachinePassResult> run(MachineFunction &Function,
+                                                const TargetDescription &Target,
+                                                MachineAnalysisManager &Analyses) override;
+
+private:
+  [[nodiscard]] Expected<MachinePassResult> runImplementation(MachineFunction &Function,
+                                                              const TargetDescription &Target,
+                                                              MachineAnalysisManager &Analyses);
+
+  MachineCodeMotionStage Stage = MachineCodeMotionStage::SelectedSSA;
+  MachineLICMOptions Options;
+};
+
+} // namespace rcc
+
+#endif // RCC_CODEGEN_MACHINELICM_H