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

[Andrei Safronov via llvm-commits]

================
@@ -348,6 +367,67 @@ static SMLoc RefineErrorLoc(const SMLoc Loc, const OperandVector &Operands,
   return Loc;
 }
 
+bool XtensaAsmParser::processInstruction(MCInst &Inst, SMLoc IDLoc,
+                                         MCStreamer &Out,
+                                         const MCSubtargetInfo *STI) {
+  Inst.setLoc(IDLoc);
+  const unsigned Opcode = Inst.getOpcode();
+  switch (Opcode) {
+  case Xtensa::L32R: {
+    const MCSymbolRefExpr *OpExpr =
+        (const MCSymbolRefExpr *)Inst.getOperand(1).getExpr();
+    XtensaMCExpr::VariantKind Kind = XtensaMCExpr::VK_Xtensa_None;
+    const MCExpr *NewOpExpr = XtensaMCExpr::create(OpExpr, Kind, getContext());
+    Inst.getOperand(1).setExpr(NewOpExpr);
+  } break;
+  case Xtensa::MOVI: {
+    XtensaTargetStreamer &TS = this->getTargetStreamer();
+
+    // Expand MOVI operand
+    if (!Inst.getOperand(1).isExpr()) {
+      uint64_t ImmOp64 = Inst.getOperand(1).getImm();
+      int32_t Imm = ImmOp64;
+      if ((Imm < -2048) || (Imm > 2047)) {
+        XtensaTargetStreamer &TS = this->getTargetStreamer();
+        MCInst TmpInst;
+        TmpInst.setLoc(IDLoc);
+        TmpInst.setOpcode(Xtensa::L32R);
+        const MCExpr *Value = MCConstantExpr::create(ImmOp64, getContext());
+        MCSymbol *Sym = getContext().createTempSymbol();
+        const MCExpr *Expr = MCSymbolRefExpr::create(
+            Sym, MCSymbolRefExpr::VK_None, getContext());
+        const MCExpr *OpExpr = XtensaMCExpr::create(
+            Expr, XtensaMCExpr::VK_Xtensa_None, getContext());
+        TmpInst.addOperand(Inst.getOperand(0));
+        MCOperand Op1 = MCOperand::createExpr(OpExpr);
+        TmpInst.addOperand(Op1);
+        TS.emitLiteral(Sym, Value, IDLoc);
+        Inst = TmpInst;
+      }
+    } else {
+      MCInst TmpInst;
+      TmpInst.setLoc(IDLoc);
+      TmpInst.setOpcode(Xtensa::L32R);
+      const MCExpr *Value = Inst.getOperand(1).getExpr();
+      MCSymbol *Sym = getContext().createTempSymbol();
+      const MCExpr *Expr =
+          MCSymbolRefExpr::create(Sym, MCSymbolRefExpr::VK_None, getContext());
+      const MCExpr *OpExpr = XtensaMCExpr::create(
+          Expr, XtensaMCExpr::VK_Xtensa_None, getContext());
+      TmpInst.addOperand(Inst.getOperand(0));
+      MCOperand Op1 = MCOperand::createExpr(OpExpr);
+      TmpInst.addOperand(Op1);
+      Inst = TmpInst;
+      TS.emitLiteral(Sym, Value, IDLoc);
+    }
+  } break;
----------------
andreisfr wrote:

Fixed

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