[llvm] [Xtensa] Implement base CallConvention. (PR #83280)

[Matt Arsenault via llvm-commits]

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@@ -23,5 +24,73 @@
 
 using namespace llvm;
 
+static inline const MachineInstrBuilder &
+addFrameReference(const MachineInstrBuilder &MIB, int FI) {
+  MachineInstr *MI = MIB;
+  MachineFunction &MF = *MI->getParent()->getParent();
+  MachineFrameInfo &MFFrame = MF.getFrameInfo();
+  const MCInstrDesc &MCID = MI->getDesc();
+  MachineMemOperand::Flags Flags = MachineMemOperand::MONone;
+  if (MCID.mayLoad())
+    Flags |= MachineMemOperand::MOLoad;
+  if (MCID.mayStore())
+    Flags |= MachineMemOperand::MOStore;
+  int64_t Offset = 0;
+  Align Alignment = MFFrame.getObjectAlign(FI);
+
+  MachineMemOperand *MMO =
+      MF.getMachineMemOperand(MachinePointerInfo::getFixedStack(MF, FI, Offset),
+                              Flags, MFFrame.getObjectSize(FI), Alignment);
+  return MIB.addFrameIndex(FI).addImm(Offset).addMemOperand(MMO);
+}
+
 XtensaInstrInfo::XtensaInstrInfo(const XtensaSubtarget &STI)
     : XtensaGenInstrInfo(), RI(STI), STI(STI) {}
+
+void XtensaInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
+                                  MachineBasicBlock::iterator MBBI,
+                                  const DebugLoc &DL, MCRegister DestReg,
+                                  MCRegister SrcReg, bool KillSrc) const {
+  // when we are copying a phys reg we want the bits for fp
+  if (Xtensa::ARRegClass.contains(DestReg, SrcReg))
+    BuildMI(MBB, MBBI, DL, get(Xtensa::OR), DestReg)
+        .addReg(SrcReg, getKillRegState(KillSrc))
+        .addReg(SrcReg, getKillRegState(KillSrc));
+  else
+    report_fatal_error("Impossible reg-to-reg copy");
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arsenm wrote:

reflow this into an assert (may not even be necessary to assert, I would assume the verifier catches the invalid regclass later)

https://github.com/llvm/llvm-project/pull/83280