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Optimize Guid comparisons #104610

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249 changes: 43 additions & 206 deletions src/libraries/System.Private.CoreLib/src/System/Guid.cs
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Original file line number Diff line number Diff line change
Expand Up @@ -1015,7 +1015,16 @@ private static bool EqualsCore(in Guid left, in Guid right)
&& Unsafe.Add(ref rA, 3) == Unsafe.Add(ref rB, 3);
}

private static int GetResult(uint me, uint them) => me < them ? -1 : 1;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static uint GetBcAsUInt32(in Guid g) => (uint)Unsafe.Add(ref Unsafe.AsRef(in g._a), 1);
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static uint GetDgAsUInt32(in Guid g) => (uint)Unsafe.Add(ref Unsafe.AsRef(in g._a), 2);
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static uint GetHkAsUInt32(in Guid g) => (uint)Unsafe.Add(ref Unsafe.AsRef(in g._a), 3);
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static uint AdjustEndiannessBc(uint bc) => BitConverter.IsLittleEndian ? uint.RotateLeft(bc, 16) : bc;
[MethodImpl(MethodImplOptions.AggressiveInlining)]
private static uint AdjustEndiannessDgHk(uint dgOrHk) => BitConverter.IsLittleEndian ? BinaryPrimitives.ReverseEndianness(dgOrHk) : dgOrHk;

public int CompareTo(object? value)
{
Expand All @@ -1037,57 +1046,25 @@ public int CompareTo(Guid value)
return GetResult((uint)_a, (uint)value._a);
}

if (value._b != _b)
{
return GetResult((uint)_b, (uint)value._b);
}

if (value._c != _c)
{
return GetResult((uint)_c, (uint)value._c);
}

if (value._d != _d)
{
return GetResult(_d, value._d);
}

if (value._e != _e)
if (GetBcAsUInt32(value) != GetBcAsUInt32(this))
{
return GetResult(_e, value._e);
return GetResult(AdjustEndiannessBc(GetBcAsUInt32(this)), AdjustEndiannessBc(GetBcAsUInt32(value)));
}

if (value._f != _f)
if (GetDgAsUInt32(value) != GetDgAsUInt32(this))
{
return GetResult(_f, value._f);
return GetResult(AdjustEndiannessDgHk(GetDgAsUInt32(this)), AdjustEndiannessDgHk(GetDgAsUInt32(value)));
}

if (value._g != _g)
if (GetHkAsUInt32(value) != GetHkAsUInt32(this))
{
return GetResult(_g, value._g);
}

if (value._h != _h)
{
return GetResult(_h, value._h);
}

if (value._i != _i)
{
return GetResult(_i, value._i);
}

if (value._j != _j)
{
return GetResult(_j, value._j);
}

if (value._k != _k)
{
return GetResult(_k, value._k);
return GetResult(AdjustEndiannessDgHk(GetHkAsUInt32(this)), AdjustEndiannessDgHk(GetHkAsUInt32(value)));
}

return 0;

[MethodImpl(MethodImplOptions.AggressiveInlining)]
static int GetResult(uint me, uint them) => me < them ? -1 : 1;
}

public static bool operator ==(Guid a, Guid b) => EqualsCore(a, b);
Expand Down Expand Up @@ -1504,54 +1481,19 @@ private static (Vector128<byte>, Vector128<byte>, Vector128<byte>) FormatGuidVec
return (uint)left._a < (uint)right._a;
}

if (left._b != right._b)
if (GetBcAsUInt32(left) != GetBcAsUInt32(right))
{
return (uint)left._b < (uint)right._b;
return AdjustEndiannessBc(GetBcAsUInt32(left)) < AdjustEndiannessBc(GetBcAsUInt32(right));
}

if (left._c != right._c)
if (GetDgAsUInt32(left) != GetDgAsUInt32(right))
{
return (uint)left._c < (uint)right._c;
return AdjustEndiannessDgHk(GetDgAsUInt32(left)) < AdjustEndiannessDgHk(GetDgAsUInt32(right));
}

if (left._d != right._d)
if (GetHkAsUInt32(left) != GetHkAsUInt32(right))
{
return left._d < right._d;
}

if (left._e != right._e)
{
return left._e < right._e;
}

if (left._f != right._f)
{
return left._f < right._f;
}

if (left._g != right._g)
{
return left._g < right._g;
}

if (left._h != right._h)
{
return left._h < right._h;
}

if (left._i != right._i)
{
return left._i < right._i;
}

if (left._j != right._j)
{
return left._j < right._j;
}

if (left._k != right._k)
{
return left._k < right._k;
return AdjustEndiannessDgHk(GetHkAsUInt32(left)) < AdjustEndiannessDgHk(GetHkAsUInt32(right));
}

return false;
Expand All @@ -1565,54 +1507,19 @@ private static (Vector128<byte>, Vector128<byte>, Vector128<byte>) FormatGuidVec
return (uint)left._a < (uint)right._a;
}

if (left._b != right._b)
{
return (uint)left._b < (uint)right._b;
}

if (left._c != right._c)
{
return (uint)left._c < (uint)right._c;
}

if (left._d != right._d)
{
return left._d < right._d;
}

if (left._e != right._e)
{
return left._e < right._e;
}

if (left._f != right._f)
{
return left._f < right._f;
}

if (left._g != right._g)
{
return left._g < right._g;
}

if (left._h != right._h)
{
return left._h < right._h;
}

if (left._i != right._i)
if (GetBcAsUInt32(left) != GetBcAsUInt32(right))
{
return left._i < right._i;
return AdjustEndiannessBc(GetBcAsUInt32(left)) < AdjustEndiannessBc(GetBcAsUInt32(right));
}

if (left._j != right._j)
if (GetDgAsUInt32(left) != GetDgAsUInt32(right))
{
return left._j < right._j;
return AdjustEndiannessDgHk(GetDgAsUInt32(left)) < AdjustEndiannessDgHk(GetDgAsUInt32(right));
}

if (left._k != right._k)
if (GetHkAsUInt32(left) != GetHkAsUInt32(right))
{
return left._k < right._k;
return AdjustEndiannessDgHk(GetHkAsUInt32(left)) < AdjustEndiannessDgHk(GetHkAsUInt32(right));
}

return true;
Expand All @@ -1626,54 +1533,19 @@ private static (Vector128<byte>, Vector128<byte>, Vector128<byte>) FormatGuidVec
return (uint)left._a > (uint)right._a;
}

if (left._b != right._b)
{
return (uint)left._b > (uint)right._b;
}

if (left._c != right._c)
{
return (uint)left._c > (uint)right._c;
}

if (left._d != right._d)
{
return left._d > right._d;
}

if (left._e != right._e)
{
return left._e > right._e;
}

if (left._f != right._f)
{
return left._f > right._f;
}

if (left._g != right._g)
{
return left._g > right._g;
}

if (left._h != right._h)
{
return left._h > right._h;
}

if (left._i != right._i)
if (GetBcAsUInt32(left) != GetBcAsUInt32(right))
{
return left._i > right._i;
return AdjustEndiannessBc(GetBcAsUInt32(left)) > AdjustEndiannessBc(GetBcAsUInt32(right));
}

if (left._j != right._j)
if (GetDgAsUInt32(left) != GetDgAsUInt32(right))
{
return left._j > right._j;
return AdjustEndiannessDgHk(GetDgAsUInt32(left)) > AdjustEndiannessDgHk(GetDgAsUInt32(right));
}

if (left._k != right._k)
if (GetHkAsUInt32(left) != GetHkAsUInt32(right))
{
return left._k > right._k;
return AdjustEndiannessDgHk(GetHkAsUInt32(left)) > AdjustEndiannessDgHk(GetHkAsUInt32(right));
}

return false;
Expand All @@ -1687,54 +1559,19 @@ private static (Vector128<byte>, Vector128<byte>, Vector128<byte>) FormatGuidVec
return (uint)left._a > (uint)right._a;
}

if (left._b != right._b)
{
return (uint)left._b > (uint)right._b;
}

if (left._c != right._c)
{
return (uint)left._c > (uint)right._c;
}

if (left._d != right._d)
{
return left._d > right._d;
}

if (left._e != right._e)
{
return left._e > right._e;
}

if (left._f != right._f)
{
return left._f > right._f;
}

if (left._g != right._g)
{
return left._g > right._g;
}

if (left._h != right._h)
{
return left._h > right._h;
}

if (left._i != right._i)
if (GetBcAsUInt32(left) != GetBcAsUInt32(right))
{
return left._i > right._i;
return AdjustEndiannessBc(GetBcAsUInt32(left)) > AdjustEndiannessBc(GetBcAsUInt32(right));
}

if (left._j != right._j)
if (GetDgAsUInt32(left) != GetDgAsUInt32(right))
{
return left._j > right._j;
return AdjustEndiannessDgHk(GetDgAsUInt32(left)) > AdjustEndiannessDgHk(GetDgAsUInt32(right));
}

if (left._k != right._k)
if (GetHkAsUInt32(left) != GetHkAsUInt32(right))
{
return left._k > right._k;
return AdjustEndiannessDgHk(GetHkAsUInt32(left)) > AdjustEndiannessDgHk(GetHkAsUInt32(right));
}

return true;
Expand Down
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