RFR: 8256318: AArch64: Add support for floating-point absolute difference [v3]

[Ningsheng Jian]

On Mon, 16 Nov 2020 02:51:05 GMT, Dong Bo <dongbo at openjdk.org> wrote:

> But I feel a little bit unconsistent that only the new fabd is added into aarch64_neon.ad,
> while other NEON intructions (i.e. fabs, fsub, fdiv, fsqrt, etc) are still in aarch64.ad.
> And moving them all from aarch64.ad to aarch64_neon.ad deviates far from this patch.

Yes, I think when we introduced aarch64_neon.ad (m4), we just tried to keep that patch simple and would move other vector rules in future patches. Maybe Andrew can comment on this?

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PR: https://git.openjdk.java.net/jdk/pull/1215