Methods for latest producer tracking in a processor. In one embodiment,
the method includes the steps of (1) writing a physical register
identification value in a first register rename map location specified by
a first instruction, (2) writing a first in-register status value in a
second register rename map location specified by the first instruction,
(3) writing a producer tracking status value at a producer tracking map
location specified by the physical register identification value, and (4)
modifying, upon graduation of the first instruction, the first
in-register status value only if the producer tracking map location
stores the producer tracking status value written in step (3). Other
methods are also presented.