1 files changed, 21 insertions, 4 deletions
diff --git a/llvm/lib/Target/Nios2/Nios2InstrInfo.cpp b/llvm/lib/Target/Nios2/Nios2InstrInfo.cpp
index 412cfcef3af..df435d2715d 100644
--- a/llvm/lib/Target/Nios2/Nios2InstrInfo.cpp
+++ b/llvm/lib/Target/Nios2/Nios2InstrInfo.cpp
@@ -13,14 +13,31 @@
 
 #include "Nios2InstrInfo.h"
 #include "Nios2TargetMachine.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
 
 using namespace llvm;
 
 #define GET_INSTRINFO_CTOR_DTOR
 #include "Nios2GenInstrInfo.inc"
 
-const Nios2InstrInfo *Nios2InstrInfo::create(Nios2Subtarget &STI) {
-  return new Nios2InstrInfo(STI);
-}
+// Pin the vtable to this file.
+void Nios2InstrInfo::anchor() {}
+
+Nios2InstrInfo::Nios2InstrInfo(Nios2Subtarget &ST)
+    : Nios2GenInstrInfo(), RI(ST), Subtarget(ST) {}
+
+/// Expand Pseudo instructions into real backend instructions
+bool Nios2InstrInfo::expandPostRAPseudo(MachineInstr &MI) const {
+  MachineBasicBlock &MBB = *MI.getParent();
 
-const Nios2RegisterInfo &Nios2InstrInfo::getRegisterInfo() const { return RI; }
+  switch (MI.getDesc().getOpcode()) {
+  default:
+    return false;
+  case Nios2::RetRA:
+    BuildMI(MBB, MI, MI.getDebugLoc(), get(Nios2::RET_R1)).addReg(Nios2::RA);
+    break;
+  }
+
+  MBB.erase(MI);
+  return true;
+}