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Re: Issue #365 vsetvl{i} x0, x0 instruction forms

David Horner
 

Messed up when I was trying to simplify the text.

On 2020-07-23 2:19 a.m., David Horner via lists.riscv.org wrote:

What of advocating for #5 - what is the overhead here?

A simplistic approach can read vl and push it through the existing circuitry,

  except when the calculated MAXVL is less than the provided vl set vill

otherwise leave the current vl alone (or overwrite it with itself, whichever).
For simple designs there is a simple implementation that can further be optimized by setting vill  on a slow path.

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