RFR: 8308776: [AArch64] Math.log is 10% slower than StrictMath.log on aarch64

[Dean Long]

On Thu, 13 Nov 2025 20:41:56 GMT, Dhamoder Nalla <dhanalla at openjdk.org> wrote:

> This PR Introduces an optimized AArch64 intrinsic for Math.log using reciprocal refinement and a table-driven polynomial.
> Improves throughput for double logarithms while preserving IEEE-754 corner case behavior (±0, subnormals, negatives, NaN).

If it was explained somewhere why Math.log is 10% slower than StrictMath.log, I missed it.  I would naively assume that Math.log can use the StrictMath.log implementation and get the same performance.

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PR Comment: https://git.openjdk.org/jdk/pull/28306#issuecomment-3550193135