private BoundExpression CompareWithConstant(BoundExpression input, BoundExpression boundConstant)
{
var systemObject = _factory.SpecialType(SpecialType.System_Object);
if (boundConstant.ConstantValue == ConstantValue.Null)
{
if (input.Type.IsNonNullableValueType())
{
var systemBoolean = _factory.SpecialType(SpecialType.System_Boolean);
return(RewriteNullableNullEquality(
syntax: _factory.Syntax,
kind: BinaryOperatorKind.NullableNullEqual,
loweredLeft: input,
loweredRight: boundConstant,
returnType: systemBoolean));
}
else
{
return(_factory.ObjectEqual(_factory.Convert(systemObject, input), boundConstant));
}
}
else if (input.Type.IsNullableType() && boundConstant.NullableNeverHasValue())
{
return(_factory.Not(MakeNullableHasValue(_factory.Syntax, input)));
}
else
{
return(_factory.StaticCall(
systemObject,
"Equals",
_factory.Convert(systemObject, boundConstant),
_factory.Convert(systemObject, input)
));
}
}