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Older-than mask
From CompArch
Building the is_older_than matrix (which takes care of ordering the array): This might appear a daunting task, but it is really quite simple. In dispatch, you must know which entries are free and which are occupied. When allocating an entry, this "free list" is the value for the is_older_than entry you are now writing!
[Ed Brekelbaum, comp.arch, June 28, 2010]
