[lworld+fp16] RFR: 8341414: Add support for FP16 conversion routines

[Bhavana Kilambi]

On Wed, 23 Oct 2024 14:07:52 GMT, Bhavana Kilambi <bkilambi at openjdk.org> wrote:

> This patch adds intrinsic support for FP16 conversion routines to int/long/double and also the aarch64 backend support. This patch implements both scalar and vector versions for these conversions.
> 
> Performance numbers on aarch64 machine with SVE support :
> 
> 
> Benchmark                         (vectorDim)   Gain
> Float16OpsBenchmark.fp16ToDouble  1024          18.23
> Float16OpsBenchmark.fp16ToInt     1024          1.93
> Float16OpsBenchmark.fp16ToLong    1024          3.95
> 
> 
> The Gain column is the ratio between thrpt of this patch and the thrpt with the intrinsics disabled (which generates FP32 arithmetic).

Hi @jatin-bhateja , I have uploaded a patch addressing your comments. Please review.

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PR Comment: https://git.openjdk.org/valhalla/pull/1283#issuecomment-2449892299