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9
F.CHAPTER
2
Definitions
This chapter defines concepts unique to the SPARC64 V, the Fujitsu implementation
of SPARC JPS1. For definition of terms that are common to all implementations,
please refer to Chapter 2 of Commonality.
committed Term applied to an instruction when it has completed without error and all
prior instructions have completed without error and have been committed. When
an instruction is committed, the state of the machine is permanently changed
to reflect the result of the instruction; the previously existing state is no longer
needed and can be discarded.
completed Term applied to an instruction after it has finished, has sent a nonerror status to
the issue unit, and all of its source operands are nonspeculative. Note:
Although the state of the machine has been temporarily altered by completion
of an instruction, the state has not yet been permanently changed and the old
state can be recovered until the instruction has been committed.
executed Term applied to an instruction that has been processed by an execution unit
such as a load unit. An instruction is in execution as long as it is still being
processed by an execution unit.
fetched Term applied to an instruction that is obtained from the I2 instruction cache or
from the on-chip internal cache and sent to the issue unit.
finished Term applied to an instruction when it has completed execution in a functional
unit and has forwarded its result onto a result bus. Results on the result bus are
transferred to the register file, as are the waiting instructions in the instruction
queues.
initiated Term applied to an instruction when it has all of the resources that it needs (for
example, source operands) and has been selected for execution.
instruction dispatch Synonym: instruction initiation.
instruction issued Term applied to an instruction when it has been dispatched to a reservation
station.