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using System;
namespace ARMeilleure.State
{
public struct V128 : IEquatable<V128>
{
private ulong _e0;
private ulong _e1;
private static V128 _zero = new V128(0, 0);
public static V128 Zero => _zero;
public V128(float value) : this(value, 0, 0, 0) { }
public V128(double value) : this(value, 0) { }
public V128(float e0, float e1, float e2, float e3)
{
_e0 = (ulong)(uint)BitConverter.SingleToInt32Bits(e0) << 0;
_e0 |= (ulong)(uint)BitConverter.SingleToInt32Bits(e1) << 32;
_e1 = (ulong)(uint)BitConverter.SingleToInt32Bits(e2) << 0;
_e1 |= (ulong)(uint)BitConverter.SingleToInt32Bits(e3) << 32;
}
public V128(double e0, double e1)
{
_e0 = (ulong)BitConverter.DoubleToInt64Bits(e0);
_e1 = (ulong)BitConverter.DoubleToInt64Bits(e1);
}
public V128(int e0, int e1, int e2, int e3)
{
_e0 = (ulong)(uint)e0 << 0;
_e0 |= (ulong)(uint)e1 << 32;
_e1 = (ulong)(uint)e2 << 0;
_e1 |= (ulong)(uint)e3 << 32;
}
public V128(uint e0, uint e1, uint e2, uint e3)
{
_e0 = (ulong)e0 << 0;
_e0 |= (ulong)e1 << 32;
_e1 = (ulong)e2 << 0;
_e1 |= (ulong)e3 << 32;
}
public V128(long e0, long e1)
{
_e0 = (ulong)e0;
_e1 = (ulong)e1;
}
public V128(ulong e0, ulong e1)
{
_e0 = e0;
_e1 = e1;
}
public V128(byte[] data)
{
_e0 = (ulong)BitConverter.ToInt64(data, 0);
_e1 = (ulong)BitConverter.ToInt64(data, 8);
}
public void Insert(int index, uint value)
{
switch (index)
{
case 0: _e0 = (_e0 & 0xffffffff00000000) | ((ulong)value << 0); break;
case 1: _e0 = (_e0 & 0x00000000ffffffff) | ((ulong)value << 32); break;
case 2: _e1 = (_e1 & 0xffffffff00000000) | ((ulong)value << 0); break;
case 3: _e1 = (_e1 & 0x00000000ffffffff) | ((ulong)value << 32); break;
default: throw new ArgumentOutOfRangeException(nameof(index));
}
}
public void Insert(int index, ulong value)
{
switch (index)
{
case 0: _e0 = value; break;
case 1: _e1 = value; break;
default: throw new ArgumentOutOfRangeException(nameof(index));
}
}
public float AsFloat()
{
return GetFloat(0);
}
public double AsDouble()
{
return GetDouble(0);
}
public float GetFloat(int index)
{
return BitConverter.Int32BitsToSingle(GetInt32(index));
}
public double GetDouble(int index)
{
return BitConverter.Int64BitsToDouble(GetInt64(index));
}
public int GetInt32(int index) => (int)GetUInt32(index);
public long GetInt64(int index) => (long)GetUInt64(index);
public uint GetUInt32(int index)
{
switch (index)
{
case 0: return (uint)(_e0 >> 0);
case 1: return (uint)(_e0 >> 32);
case 2: return (uint)(_e1 >> 0);
case 3: return (uint)(_e1 >> 32);
}
throw new ArgumentOutOfRangeException(nameof(index));
}
public ulong GetUInt64(int index)
{
switch (index)
{
case 0: return _e0;
case 1: return _e1;
}
throw new ArgumentOutOfRangeException(nameof(index));
}
public byte[] ToArray()
{
byte[] e0Data = BitConverter.GetBytes(_e0);
byte[] e1Data = BitConverter.GetBytes(_e1);
byte[] data = new byte[16];
Buffer.BlockCopy(e0Data, 0, data, 0, 8);
Buffer.BlockCopy(e1Data, 0, data, 8, 8);
return data;
}
public override int GetHashCode()
{
return HashCode.Combine(_e0, _e1);
}
public static V128 operator ~(V128 x)
{
return new V128(~x._e0, ~x._e1);
}
public static V128 operator &(V128 x, V128 y)
{
return new V128(x._e0 & y._e0, x._e1 & y._e1);
}
public static V128 operator |(V128 x, V128 y)
{
return new V128(x._e0 | y._e0, x._e1 | y._e1);
}
public static V128 operator ^(V128 x, V128 y)
{
return new V128(x._e0 ^ y._e0, x._e1 ^ y._e1);
}
public static V128 operator <<(V128 x, int shift)
{
ulong shiftOut = x._e0 >> (64 - shift);
return new V128(x._e0 << shift, (x._e1 << shift) | shiftOut);
}
public static V128 operator >>(V128 x, int shift)
{
ulong shiftOut = x._e1 & ((1UL << shift) - 1);
return new V128((x._e0 >> shift) | (shiftOut << (64 - shift)), x._e1 >> shift);
}
public static bool operator ==(V128 x, V128 y)
{
return x.Equals(y);
}
public static bool operator !=(V128 x, V128 y)
{
return !x.Equals(y);
}
public override bool Equals(object obj)
{
return obj is V128 vector && Equals(vector);
}
public bool Equals(V128 other)
{
return other._e0 == _e0 && other._e1 == _e1;
}
public override string ToString()
{
return $"0x{_e1:X16}{_e0:X16}";
}
}
}
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