1 files changed, 47 insertions, 1 deletions
diff --git a/lib/Target/RISCV/RISCVInstrInfo.cpp b/lib/Target/RISCV/RISCVInstrInfo.cpp
index 92db5358ce4..5b4f4fcbb88 100644
--- a/lib/Target/RISCV/RISCVInstrInfo.cpp
+++ b/lib/Target/RISCV/RISCVInstrInfo.cpp
@@ -28,4 +28,50 @@
 
 using namespace llvm;
 
-RISCVInstrInfo::RISCVInstrInfo() : RISCVGenInstrInfo() {}
+RISCVInstrInfo::RISCVInstrInfo()
+    : RISCVGenInstrInfo(RISCV::ADJCALLSTACKDOWN, RISCV::ADJCALLSTACKUP) {}
+
+void RISCVInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
+                                 MachineBasicBlock::iterator MBBI,
+                                 const DebugLoc &DL, unsigned DstReg,
+                                 unsigned SrcReg, bool KillSrc) const {
+  assert(RISCV::GPRRegClass.contains(DstReg, SrcReg) &&
+         "Impossible reg-to-reg copy");
+
+  BuildMI(MBB, MBBI, DL, get(RISCV::ADDI), DstReg)
+      .addReg(SrcReg, getKillRegState(KillSrc))
+      .addImm(0);
+}
+
+void RISCVInstrInfo::storeRegToStackSlot(MachineBasicBlock &MBB,
+                                         MachineBasicBlock::iterator I,
+                                         unsigned SrcReg, bool IsKill, int FI,
+                                         const TargetRegisterClass *RC,
+                                         const TargetRegisterInfo *TRI) const {
+  DebugLoc DL;
+  if (I != MBB.end())
+    DL = I->getDebugLoc();
+
+  if (RC == &RISCV::GPRRegClass)
+    BuildMI(MBB, I, DL, get(RISCV::SW))
+        .addReg(SrcReg, getKillRegState(IsKill))
+        .addFrameIndex(FI)
+        .addImm(0);
+  else
+    llvm_unreachable("Can't store this register to stack slot");
+}
+
+void RISCVInstrInfo::loadRegFromStackSlot(MachineBasicBlock &MBB,
+                                          MachineBasicBlock::iterator I,
+                                          unsigned DstReg, int FI,
+                                          const TargetRegisterClass *RC,
+                                          const TargetRegisterInfo *TRI) const {
+  DebugLoc DL;
+  if (I != MBB.end())
+    DL = I->getDebugLoc();
+
+  if (RC == &RISCV::GPRRegClass)
+    BuildMI(MBB, I, DL, get(RISCV::LW), DstReg).addFrameIndex(FI).addImm(0);
+  else
+    llvm_unreachable("Can't load this register from stack slot");
+}