llvm/test/TableGen/VarLenDecoder.td

// RUN: llvm-tblgen -gen-disassembler -I %p/../../include %s | FileCheck %s

include "llvm/Target/Target.td"

def ArchInstrInfo : InstrInfo { }

def Arch : Target {
  let InstructionSet = ArchInstrInfo;
}

def Reg : Register<"reg">;

def RegClass : RegisterClass<"foo", [i64], 0, (add Reg)>;

def GR64 : RegisterOperand<RegClass>;

class MyMemOperand<dag sub_ops> : Operand<iPTR> {
  let MIOperandInfo = sub_ops;
  dag Base;
  dag Extension;
}

def MemOp16: MyMemOperand<(ops GR64:$reg, i16imm:$offset)>;

def MemOp32: MyMemOperand<(ops GR64:$reg, i32imm:$offset)>;

class MyVarInst<MyMemOperand memory_op> : Instruction {
  dag Inst;

  let OutOperandList = (outs GR64:$dst);
  let InOperandList  = (ins memory_op:$src);
}

def FOO16 : MyVarInst<MemOp16> {
  let Inst = (ascend
      (descend (operand "$dst", 3), 0b01000, (operand "$src.reg", 3)),
      (slice "$src.offset", 15, 0, (decoder "myCustomDecoder"))
  );
}
def FOO32 : MyVarInst<MemOp32> {
  let Inst = (ascend
      (descend (operand "$dst", 3), 0b01001,
      (operand "$src.reg", 3, (decoder "myCustomDecoder"))),
      (slice "$src.offset", 31, 16),
      (slice "$src.offset", 15, 0)
  );
}

// CHECK:      MCD::OPC_ExtractField, 3, 5,  // Inst{7-3} ...
// CHECK-NEXT: MCD::OPC_FilterValue, 8, 4, 0, 0, // Skip to: 12
// CHECK-NEXT: MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 0, // Opcode: FOO16
// CHECK-NEXT: MCD::OPC_FilterValue, 9, 4, 0, 0, // Skip to: 21
// CHECK-NEXT: MCD::OPC_Decode, {{[0-9]+}}, {{[0-9]+}}, 1, // Opcode: FOO32
// CHECK-NEXT: MCD::OPC_Fail,

// Instruction length table
// CHECK: 27,
// CHECK-NEXT: 43,
// CHECK-NEXT: };

// CHECK:      case 0:
// CHECK-NEXT: tmp = fieldFromInstruction(insn, 8, 3);
// CHECK-NEXT: if (!Check(S, DecodeRegClassRegisterClass(MI, tmp, Address, Decoder))) { return MCDisassembler::Fail; }
// CHECK-NEXT: tmp = fieldFromInstruction(insn, 0, 3);
// CHECK-NEXT: if (!Check(S, DecodeRegClassRegisterClass(MI, tmp, Address, Decoder))) { return MCDisassembler::Fail; }
// CHECK-NEXT: tmp = fieldFromInstruction(insn, 11, 16);
// CHECK-NEXT: if (!Check(S, myCustomDecoder(MI, tmp, Address, Decoder))) { return MCDisassembler::Fail; }
// CHECK-NEXT: return S;
// CHECK-NEXT: case 1:
// CHECK-NEXT: tmp = fieldFromInstruction(insn, 8, 3);
// CHECK-NEXT: if (!Check(S, DecodeRegClassRegisterClass(MI, tmp, Address, Decoder))) { return MCDisassembler::Fail; }
// CHECK-NEXT: tmp = fieldFromInstruction(insn, 0, 3);
// CHECK-NEXT: if (!Check(S, myCustomDecoder(MI, tmp, Address, Decoder))) { return MCDisassembler::Fail; }
// CHECK-NEXT: tmp = 0x0;
// CHECK-NEXT: insertBits(tmp, fieldFromInstruction(insn, 11, 16), 16, 16);
// CHECK-NEXT: insertBits(tmp, fieldFromInstruction(insn, 27, 16), 0, 16);
// CHECK-NEXT: MI.addOperand(MCOperand::createImm(tmp));
// CHECK-NEXT: return S;

// CHECK-LABEL: case MCD::OPC_ExtractField: {
// CHECK: makeUp(insn, Start + Len);

// CHECK-LABEL: case MCD::OPC_CheckField: {
// CHECK: makeUp(insn, Start + Len);

// CHECK-LABEL: case MCD::OPC_Decode: {
// CHECK: Len = InstrLenTable[Opc];
// CHECK-NEXT: makeUp(insn, Len);