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Altera_Forum
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7 years ago

Does initiation interval of 1 means no need for unrollment?

I have one basic question. In case of Single-Thread mode kernels, if I have one single loop and I'll be able to achieve initiation interval of one, is it still beneficial to unroll the loop? My assum...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
7 years ago

Yes, that is definitely possible. The II in a single work-item kernel is set for the worst case scenario. If you cannot reduce the II to one, implementing your code as an NDRange kernel could achieve a better average II in the end, since the II is adjusted at run-time by the scheduler. This is more or less the only situation where an NDRange implementation is preferred over single work-item.