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INSTRUCTION SET OVERVIEW
5.3.2.4
Execute in Imprecise Fault Mode
Significant performance improvement is possible by allowing imprecise faults (AC.nif = 0). In
precise fault mode (AC.nif = 1), the processor does not issue a new instruction until the previous
one has completed. This ensures that a fault from the previous instruction is delivered before the
next instruction can begin execution. Imprecise fault mode allows new instructions to be issued
before previous ones have completed, thus increasing the instruction issue rate. Many applications
can tolerate the imprecise fault reporting for the performance gain. When necessary, a
can
syncf
be used in imprecise fault mode to isolate faults at desired points of execution.
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