ryujinx/ARMeilleure/Decoders/OpCodeMemLit.cs

namespace ARMeilleure.Decoders
{
    class OpCodeMemLit : OpCode, IOpCodeLit
    {
        public int  Rt        { get; }
        public long Immediate { get; }
        public int  Size      { get; }
        public bool Signed    { get; }
        public bool Prefetch  { get; }

        public new static OpCode Create(InstDescriptor inst, ulong address, int opCode) => new OpCodeMemLit(inst, address, opCode);

        public OpCodeMemLit(InstDescriptor inst, ulong address, int opCode) : base(inst, address, opCode)
        {
            Rt = opCode & 0x1f;

            Immediate = (long)address + DecoderHelper.DecodeImmS19_2(opCode);

            switch ((opCode >> 30) & 3)
            {
                case 0: Size = 2; Signed = false; Prefetch = false; break;
                case 1: Size = 3; Signed = false; Prefetch = false; break;
                case 2: Size = 2; Signed = true;  Prefetch = false; break;
                case 3: Size = 0; Signed = false; Prefetch = true;  break;
            }
        }
    }
}