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Concept
Reservation station
Summary
A unified reservation station, also known as unified scheduler, is a decentralized feature of the microarchitecture of a CPU that allows for register renaming, and is used by the Tomasulo algorithm for dynamic instruction scheduling.
Reservation stations permit the CPU to fetch and re-use a data value as soon as it has been computed, rather than waiting for it to be stored in a register and re-read. When instructions are issued, they can designate the reservation station from which they want their input to read. When multiple instructions need to write to the same register, all can proceed and only the (logically) last one need actually be written.
It checks if the operands are available (RAW) and if execution unit is free (Structural hazard) before starting execution.
Instructions are stored with available parameters, and executed when ready. Results are identified by the unit that will execute the corresponding instruction.
Implicitly register renaming solves WAR and WAW haza
Official source
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