protected internal override void VisitAST(BinaryExprAST node)
{
// for convenience, convert both of the LHS and RHS type explicitly
var ty = (TypeKind) Math.Max((int) node.Lhs.RetType, (int) node.Rhs.RetType);
this.Visit(node.Lhs);
GenCode.Add(Ins.Conv(node.Lhs.RetType,ty));
this.Visit(node.Rhs);
GenCode.Add(Ins.Conv(node.Rhs.RetType, ty));
var code = node.NodeType switch
{
ASTType.Add => Ins.Add(ty),
ASTType.Subtract => Ins.Sub(ty),
ASTType.Multiply => Ins.Mul(ty),
ASTType.Divide => Ins.Div(ty),
ASTType.Modulo => Ins.Mod(),
ASTType.Equal => Ins.Equ(ty),
ASTType.NotEqual => Ins.Neq(ty),
ASTType.LessThan => Ins.Les(ty),
ASTType.LessEqual => Ins.Leq(ty),
ASTType.GreaterThan => Ins.Grt(ty),
ASTType.GreaterEqual => Ins.Geq(ty),
ASTType.And => Ins.And(),
ASTType.Or => Ins.Or(),
_ => throw new NotImplementedException()
};
GenCode.Add(code);
}