Performance per single clock cycle

By: hobold (hobold.delete@this.vectorizer.org), June 16, 2022 12:36 pm
Room: Moderated Discussions
Doug S (foo.delete@this.bar.bar) on June 16, 2022 9:39 am wrote:
> hobold (hobold.delete@this.vectorizer.org) on June 16, 2022 5:12 am wrote:

> > How much % of cycle time is latch overhead these days? What if instead of the usual beat
> > "latch work latch work latch" you built for "latch work work latch work work latch"?

> It sounds like you're suggesting something like Pentium
> 4's "double pumped ALU" (aka "Rapid Execution Engine")

I tried to suggest the opposite, but communication isn't my strong suite, it seems. Assume that "latch" represents the same amount of time in both rhythms above, and "work" likewise. Then "latch work" is one clock cycle in the usual manner. But "latch work work" was a longer, slower clock cycle; potentially executing two dependent operations in less time than the traditional "latch work" pipeline, despite the nominally lower clock frequency.
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M2 benchmarks-2022/06/15 12:27 PM
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