public int Cast(long a)
{
if (a < int.MinValue || a > int.MaxValue)
{
MathOperationError.Overflow();
}
return((int)a);
}
public Vector <long> Add(Vector <long> lhs, Vector <int> rhs)
{
// Adapted from Hacker's Delight p26, where both inputs need to be of the same sign, and that sign is different from result
// (i.e. xors for diff, and for both, less and zero for checking sign bit set)
Vector.Widen(rhs, out var rhs1, out var rhs2);
var partialResult = Vector.Add(lhs, rhs1);
var partialResultCheck = Vector.BitwiseAnd(Vector.Xor(partialResult, lhs), Vector.Xor(partialResult, rhs1));
var finalResult = Vector.Add(partialResult, rhs2);
var finalResultCheck = Vector.BitwiseAnd(Vector.Xor(finalResult, partialResult), Vector.Xor(finalResult, rhs2));
if (Vector.LessThanAny(Vector.BitwiseOr(partialResultCheck, finalResultCheck), Vector <long> .Zero))
{
MathOperationError.Overflow();
}
return(finalResult);
}
