Imported Upstream version 5.18.0.161

Former-commit-id: 4db48158d3a35497b8f118ab21b5f08ac3d86d98

external/llvm/lib/Target/Nios2/Nios2InstrInfo.cpp

@@ -0,0 +1,43 @@
+//===-- Nios2InstrInfo.cpp - Nios2 Instruction Information ----------------===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+// This file contains the Nios2 implementation of the TargetInstrInfo class.
+//
+//===----------------------------------------------------------------------===//
+
+#include "Nios2InstrInfo.h"
+#include "Nios2TargetMachine.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+
+using namespace llvm;
+
+#define GET_INSTRINFO_CTOR_DTOR
+#include "Nios2GenInstrInfo.inc"
+
+// 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();
+
+  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;
+}