Data dependency: Difference between revisions

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3. B = 7

A new variable, B2, has been declared as a copy of B in a new instruction, instruction N. The anti-dependency between 2 and 3 has been removed, meaning that these instructions may now be executed in parallel. However,

Note thethat modificationthere hasis introducedstill a newread-after-write dependency: instruction 2 is now truly dependent on instruction N, which is truly dependent upon instruction 1. AsThis flowdependency dependenciesexisted in the original version, thesewhere newinstruction dependencies2 arewas truly dependent on instruction 1. This dependency impossiblecannot tobe safely removeremoved.<ref name="architecture"/>

=== Output dependency (write-after-write) ===