[CodeGen] Match LLVM machine copy propagation

1 files changed, 16 insertions, 0 deletions

diff --git a/backend/include/rcc/CodeGen/TargetInstrInfo.h b/backend/include/rcc/CodeGen/TargetInstrInfo.h
index 34752c5..8457ede 100644
--- a/backend/include/rcc/CodeGen/TargetInstrInfo.h
+++ b/backend/include/rcc/CodeGen/TargetInstrInfo.h
@@ -16,8 +16,14 @@ namespace rcc {
 class MachineBasicBlock;
 class MachineFunction;
 class MachineInstr;
+class MachineOperand;
 class TargetDescription;
 
+struct MachineCopyOperands final {
+  MachineOperand *Destination = nullptr;
+  MachineOperand *Source = nullptr;
+};
+
 struct MachineBranchAnalysis final {
   MachineInstr *Conditional = nullptr;
   MachineInstr *Unconditional = nullptr;
@@ -57,6 +63,16 @@ public:
                                                     const MachineFunction &Function,
                                                     const TargetDescription &Target) const = 0;
 
+  [[nodiscard]] virtual std::optional<MachineCopyOperands>
+  getCopyOperands(MachineInstr &) const noexcept {
+    return std::nullopt;
+  }
+
+  [[nodiscard]] virtual Expected<bool> simplifyInstruction(MachineInstr &, MachineFunction &,
+                                                           const TargetDescription &) const {
+    return false;
+  }
+
   [[nodiscard]] virtual Expected<bool> tryConvertToThreeAddress(MachineInstr &, std::size_t,
                                                                 std::size_t, MachineFunction &,
                                                                 const TargetDescription &) const {