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using System;
namespace ARMeilleure.Decoders
{
abstract class OpCode32SimdBase : OpCode32, IOpCode32Simd
{
public int Vd { get; protected set; }
public int Vm { get; protected set; }
public int Size { get; protected set; }
// Helpers to index doublewords within quad words. Essentially, looping over the vector starts at quadword Q and index Fx or Ix within it,
// depending on instruction type.
//
// Qx: The quadword register that the target vector is contained in.
// Ix: The starting index of the target vector within the quadword, with size treated as integer.
// Fx: The starting index of the target vector within the quadword, with size treated as floating point. (16 or 32)
public int Qd => GetQuadwordIndex(Vd);
public int Id => GetQuadwordSubindex(Vd) << (3 - Size);
public int Fd => GetQuadwordSubindex(Vd) << (1 - (Size & 1)); // When the top bit is truncated, 1 is fp16 which is an optional extension in ARMv8.2. We always assume 64.
public int Qm => GetQuadwordIndex(Vm);
public int Im => GetQuadwordSubindex(Vm) << (3 - Size);
public int Fm => GetQuadwordSubindex(Vm) << (1 - (Size & 1));
protected int GetQuadwordIndex(int index)
{
return RegisterSize switch
{
RegisterSize.Simd128 or RegisterSize.Simd64 => index >> 1,
_ => throw new InvalidOperationException(),
};
}
protected int GetQuadwordSubindex(int index)
{
return RegisterSize switch
{
RegisterSize.Simd128 => 0,
RegisterSize.Simd64 => index & 1,
_ => throw new InvalidOperationException(),
};
}
protected OpCode32SimdBase(InstDescriptor inst, ulong address, int opCode, bool isThumb) : base(inst, address, opCode)
{
IsThumb = isThumb;
}
}
}
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