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Yeah I think even traditional OoO designs use replay for missed loads rather than stalling. The performance would be too bad if it actually stalled for every lo
by IshKebab 1y ago
Yeah I think even traditional OoO designs use replay for missed loads rather than stalling. The performance would be too bad if it actually stalled for every load.
I think stalling is used for rarer more awkward things like changing privilege modes or writing certain CSRs (e.g. satp) where you don't want to have to maintain speculative state.
- monocasa 1y agoTraditional OoO designs don't stall for loads per se, but will stall for a full ROB that has a chain of dependencies waiting on the results of the load.
- IshKebab 1y agoGood point, but I guess that's the sort of delay that you can't avoid. If there's literally no work to do until a load is available you have to wait. This design can't avoid that either.