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Simplify Guid comparisons #125519

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1ba2f85
Simplify Guid comparisons
pentp Mar 13, 2026
934718f
Address PR feedback
pentp Mar 17, 2026
4266688
Address PR feedback p2
pentp Mar 20, 2026
2240bdb
Cleanup
pentp Mar 20, 2026
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298 changes: 17 additions & 281 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 @@ -1104,8 +1104,6 @@ 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;

public int CompareTo(object? value)
{
if (value == null)
Expand All @@ -1123,60 +1121,30 @@ public int CompareTo(Guid value)
{
if (value._a != _a)
{
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)
{
return GetResult(_e, value._e);
}

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

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

if (value._h != _h)
{
return GetResult(_h, value._h);
return (uint)_a < (uint)value._a ? -1 : 1;
}

if (value._i != _i)
int r = ((ushort)_b).CompareTo((ushort)value._b);
if (r != 0)
{
return GetResult(_i, value._i);
return r;
}

if (value._j != _j)
r = ((ushort)_c).CompareTo((ushort)value._c);
if (r != 0)
{
return GetResult(_j, value._j);
return r;
}

if (value._k != _k)
ulong x = Unsafe.BitCast<Guid, (ulong, ulong)>(this).Item2;
ulong y = Unsafe.BitCast<Guid, (ulong, ulong)>(value).Item2;
if (BitConverter.IsLittleEndian)
{
return GetResult(_k, value._k);
x = BinaryPrimitives.ReverseEndianness(x);
y = BinaryPrimitives.ReverseEndianness(y);
}

return 0;
return x.CompareTo(y);
}

public static bool operator ==(Guid a, Guid b) => EqualsCore(a, b);
Expand Down Expand Up @@ -1586,248 +1554,16 @@ private static (Vector128<byte>, Vector128<byte>, Vector128<byte>) FormatGuidVec
//

/// <inheritdoc cref="IComparisonOperators{TSelf, TOther, TResult}.op_LessThan(TSelf, TOther)" />
public static bool operator <(Guid left, Guid right)
{
if (left._a != right._a)
{
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)
{
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 false;
}
public static bool operator <(Guid left, Guid right) => left.CompareTo(right) < 0;

/// <inheritdoc cref="IComparisonOperators{TSelf, TOther, TResult}.op_LessThanOrEqual(TSelf, TOther)" />
public static bool operator <=(Guid left, Guid right)
{
if (left._a != right._a)
{
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)
{
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 true;
}
public static bool operator <=(Guid left, Guid right) => left.CompareTo(right) <= 0;

/// <inheritdoc cref="IComparisonOperators{TSelf, TOther, TResult}.op_GreaterThan(TSelf, TOther)" />
public static bool operator >(Guid left, Guid right)
{
if (left._a != right._a)
{
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)
{
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 false;
}
public static bool operator >(Guid left, Guid right) => left.CompareTo(right) > 0;

/// <inheritdoc cref="IComparisonOperators{TSelf, TOther, TResult}.op_GreaterThanOrEqual(TSelf, TOther)" />
public static bool operator >=(Guid left, Guid right)
{
if (left._a != right._a)
{
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)
{
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 true;
}
public static bool operator >=(Guid left, Guid right) => left.CompareTo(right) >= 0;

//
// IParsable
Expand Down
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