==========================
Exercise related to macros                                      [TOC]
==========================

Implement the macros described below and test them.  For testing figure
out some small and simple examples.


Some little helpers
===================

We want to express some common operations more expressive:

- Write a macro `cmp` such that for example  `cmp $0, %5` expands to
  `subq $0, %5, %0`.
- Write the macros `inc` and `dec` such that for example `inc %5` and
  `dec %5` increment and decrement the content of `%5` respectively.


Loading and storing a Quad-Word
===============================

Assume that `n` denotes some label.  Write the macros `ldq` and `stq` that
behave as follows:

- `ldq n, %5`: Register 5 gets overwritten with the quad-word at the absolute
  address `n`
- `stq %5, n`: the quad-word in register 5 overwrites the quad-word at
  absolute address `n`


Factorial
=========
Write an assembly program that computes the factorial based on a for-loop


Vector-Sum
==========
Write a assembly program that contains in the data segment:

- the length of a vector (as a unsigned quad-word integer)
- the vector elements (as signed quad-word integers)

When the program is finish the vector length should be overwritten with the sum of
the elements.



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