RFR: 8312425: [vectorapi] AArch64: Optimize vector math operations with SLEEF [v3]

Wed Nov 22 01:45:11 UTC 2023

On Tue, 21 Nov 2023 18:14:41 GMT, Paul Sandoz <psandoz at openjdk.org> wrote:

> > This looks good. As far as I can tell the choice you've made of accuracy matches what we need to meet the spec.
> 
> Same here . Sinh/cosh/tanh/expm1 are specified to be within 2.5 ulps of the exact result, but i believe sleef does not offer that option, it's either within 1 or 3.5, so we have to pick the former. AFAICT sleef does not say anything about monotonicity, but we relax semi-monotonicity for all but sqrt (we defer to IEEE 754).

Yes, that's why we at least have to use the 1up in sleef here.

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PR Comment: https://git.openjdk.org/jdk/pull/16234#issuecomment-1821956522