8 wide vs 6 wide

By: dmcq (dmcq.delete@this.fano.co.uk), November 15, 2016 3:17 am
Room: Moderated Discussions
Wilco (Wilco.Dijkstra.delete@this.ntlworld.com) on November 14, 2016 3:53 pm wrote:
>.....
>
> ARM quotes micro-op ratio of 1.08 for Cortex-A72, so yes that means ~95% of executed instructions
> are a single micro-op. Denver isn't relevant here, and we don't have any details about Vulcan.
>
> Wilco

No that doesn't follow. As well as instructions that are split there are also ones that are fused, especially for constructing constants. And I'm not sure what they do about unconditional branches, why should they form micro-ops at all? It is just a ratio between instructions and micro-ops that almost by chance happens to be so close to 1.
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                          8 wide vs 6 widejuanrga2016/10/29 10:41 PM
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