[CodeGen] Implement machine SSA exit

1 files changed, 49 insertions, 0 deletions

diff --git a/backend/include/rcc/CodeGen/MachineSSAExit.h b/backend/include/rcc/CodeGen/MachineSSAExit.h
new file mode 100644
index 0000000..d98c0b9
--- /dev/null
+++ b/backend/include/rcc/CodeGen/MachineSSAExit.h
@@ -0,0 +1,49 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef RCC_CODEGEN_MACHINESSAEXIT_H
+#define RCC_CODEGEN_MACHINESSAEXIT_H
+
+#include "rcc/CodeGen/MachinePass.h"
+#include "rcc/CodeGen/TargetCodeGen.h"
+
+namespace rcc {
+
+class PHIEliminationPass final : public MachineFunctionPass {
+public:
+  PHIEliminationPass() noexcept = default;
+  explicit PHIEliminationPass(const TargetSSAInfo &Info) noexcept : Info(&Info) {}
+
+  [[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);
+
+  const TargetSSAInfo *Info = nullptr;
+};
+
+class TwoAddressRewritePass final : public MachineFunctionPass {
+public:
+  TwoAddressRewritePass() noexcept = default;
+  explicit TwoAddressRewritePass(const TargetSSAInfo &Info) noexcept : Info(&Info) {}
+
+  [[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);
+
+  const TargetSSAInfo *Info = nullptr;
+};
+
+} // namespace rcc
+
+#endif // RCC_CODEGEN_MACHINESSAEXIT_H