From df7095e67ea06f7d6a81d99e70c804ce54ef950d Mon Sep 17 00:00:00 2001
From: Richard-Qin-X <richard.qin.001@gmail.com>
Date: Wed, 19 Aug 2026 05:13:13 +0800
Subject: [GlobalISel] Generate prelegalizer combiner rules

---
 backend/include/rcc/CodeGen/GlobalISel/Combiner.h | 50 +++++++++++++++++++++++
 1 file changed, 50 insertions(+)
 create mode 100644 backend/include/rcc/CodeGen/GlobalISel/Combiner.h

(limited to 'backend/include/rcc/CodeGen/GlobalISel/Combiner.h')

diff --git a/backend/include/rcc/CodeGen/GlobalISel/Combiner.h b/backend/include/rcc/CodeGen/GlobalISel/Combiner.h
new file mode 100644
index 0000000..efb6bbf
--- /dev/null
+++ b/backend/include/rcc/CodeGen/GlobalISel/Combiner.h
@@ -0,0 +1,50 @@
+// SPDX-License-Identifier: GPL-3.0-or-later
+
+#ifndef RCC_CODEGEN_GLOBALISEL_COMBINER_H
+#define RCC_CODEGEN_GLOBALISEL_COMBINER_H
+
+#include "rcc/CodeGen/GlobalISel/GIMatchTableExecutor.h"
+#include "rcc/CodeGen/MachinePassManager.h"
+
+#include <cstddef>
+#include <string>
+#include <utility>
+
+namespace rcc {
+
+class GlobalISelCombinerPass final : public MachineFunctionPass {
+public:
+  GlobalISelCombinerPass(const GIMatchTable &Table, const GIMatchTableExecutor &Executor,
+                         std::string PassName, std::size_t MaximumRewrites = 4096,
+                         std::size_t MaximumIterations = 8) noexcept
+      : Table(&Table), Executor(&Executor), PassName(std::move(PassName)),
+        MaximumRewrites(MaximumRewrites), MaximumIterations(MaximumIterations) {
+    Contract.Name = this->PassName;
+    Contract.Requires = {MachineFunctionProperty::IsSSA};
+    Contract.VerificationStage = PipelineStage::MachineIRInput;
+    Contract.ThreadSafety = PassThreadSafety::ThreadSafe;
+    Contract.DeclaredChanges = {MachinePassChange::Instructions, MachinePassChange::Operands,
+                                MachinePassChange::Registers};
+  }
+
+  [[nodiscard]] const MachinePassContract &contract() const noexcept override;
+  [[nodiscard]] Expected<MachinePassResult> run(MachineFunction &Function,
+                                                const TargetDescription &Target,
+                                                MachineFunctionAnalysisManager &Analyses) override;
+
+private:
+  [[nodiscard]] Expected<MachinePassResult> runImplementation(MachineFunction &Function,
+                                                              const TargetDescription &Target,
+                                                              MachineActionReplay &Actions) const;
+
+  const GIMatchTable *Table;
+  const GIMatchTableExecutor *Executor;
+  std::string PassName;
+  std::size_t MaximumRewrites;
+  std::size_t MaximumIterations;
+  MachinePassContract Contract;
+};
+
+} // namespace rcc
+
+#endif // RCC_CODEGEN_GLOBALISEL_COMBINER_H
-- 
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