to process instruction Y before instruction X reaches stage B, the register may still contain the old value, and the effect of Y would be incorrect.

In order to handle such conflicts correctly, the pipeline must be provided with extra circuitry or logic that detects them and takes the appropriate action. Strategies for doing so include:
* Stalling: Every affected stage, such as A, is halted until the dependency is resolved--that is, until the required information is available and/or the required state has been achieved.
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