Can we specify cut timing path along with the code?

This what I found in the QII13.0 help:

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The following example shows how you can also use altera_attribute for more complex assignments involving more than one instance. In this example, the following VHDL sample uses an altera_attribute to cut all timing paths from q1 to q2:

signal q1, q2 : std_logic;

attribute altera_attribute : string;

-- Equiv to set_instance_assignment -name CUT ON -from q1 -to q2

attribute altera_attribute of q1 : signal is "-name CUT ON -to q2";

You may specify either the -to option or the -from option in a single altera_attribute; integrated synthesis automatically sets the remaining option to the target of the altera_attribute. You may also specify wildcards for either option. For example, if you specify * for the -to option instead of q2, the Quartus II software cuts all timing paths from q1 to every other register in the design.

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Wouldn't you need an extra register stage before applying the xor to get the output pulse?

Regards,

Josy