RFR: 8282431: AArch64: Add optimized rules for masked vector multiply-add/sub for SVE

[Xiaohong Gong]

On Tue, 8 Mar 2022 18:43:25 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

> Did you consider writing a test using the IR test framework?

Thanks for looking at this patch @PaulSandoz ! Yeah, I considered using the IR test framework. The main reason that I didn't use it finally is that this patch only changes the generated codes by adding match rules with out no IR changes.  And I misunderstood that the ir framework can only check the C2 IR nodes. Seems it can also check the assembly codes. I will change the tests to use it. Thanks!

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PR: https://git.openjdk.java.net/jdk/pull/7737