RFR: 8345125: Aarch64: Add aarch64 backend for Float16 scalar operations

[Andrew Haley]

On Mon, 24 Feb 2025 12:09:57 GMT, Bhavana Kilambi <bkilambi at openjdk.org> wrote:

> This patch adds aarch64 backend for scalar FP16 operations namely - add, subtract, multiply, divide, fma, sqrt, min and max.

src/hotspot/cpu/aarch64/aarch64.ad line 17275:

> 17273: 
> 17274: // This pattern would result in the following instructions (the first two are for ConvF2HF
> 17275: // and the last instruction is for ReinterpretS2HF) -

Suggestion:

// Without this pattern, (ReinterpretS2HF (ConvF2HF src)) would result in the following instructions (the first two for ConvF2HF
// and the last instruction for ReinterpretS2HF) -

Reads a little better, I think?

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PR Review Comment: https://git.openjdk.org/jdk/pull/23748#discussion_r1968070079