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

Krste Asanovic

On Wed, 22 Jul 2020 23:37:02 -0700, Andrew Waterman <andrew@...> said:
| On Wed, Jul 22, 2020 at 11:19 PM David Horner <ds2horner@...> wrote:

| #3) If vill is set should vl remain unchanged? (I vote for yes).

| Other vsetvl[i] instructions that set vill=1 also set vl=0.  Deviating from that course would be needlessly painful and not especially beneficial.

It does add a non-orthogonality, but it is certainly beneficial in
renamed machines to know that vl is never changed by the instruction.


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