RFR: 8255438: [Vector API] More instructs in x86.ad should use legacy mode for code-gen [v2]

[Jie Fu]

On Wed, 28 Oct 2020 09:58:34 GMT, Vladimir Ivanov <vlivanov at openjdk.org> wrote:

> Looks good.
> 
> At some point, I thought about introducing new flavors of generic vector operands which would capture the dependency between legacy vectors and BW/DQ (by relying on dynamic register classes and dispatch between legacy and full-range register maks depending on the presence of BW and DQ respectively), but haven't had a chance to experiment with it. The main motivation was (and still is) to reduce redundant AD instructions which are kept solely to reify legacy register constraint.

Sounds great!
Thanks @iwanowww .

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PR: https://git.openjdk.java.net/jdk/pull/874