RFR: 8329816: Add SLEEF version 3.6.1 [v3]

[Hamlin Li]

On Thu, 27 Jun 2024 22:03:37 GMT, Mikael Vidstedt <mikael at openjdk.org> wrote:

>> [JDK-8312425](https://bugs.openjdk.org/browse/JDK-8312425) is looking to optimize vector math operations by leveraging the SLEEF library. For legal reasons the actual contribution of the SLEEF files needs to be handled separately. This enhancement adds the relevant files, enabling the rest of [JDK-8312425](https://bugs.openjdk.org/browse/JDK-8312425) to move forward.
>
> Mikael Vidstedt has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Update README to include RISC-V

Just some minor comments in README, otherwise looks good.

src/jdk.incubator.vector/linux/native/libvectormath/README line 18:

> 16: NOTE: The following cmake options are necessary when building SLEEF:
> 17: * -DSLEEF_BUILD_INLINE_HEADERS=ON
> 18: * -DSLEEF_ENFORCE_SVE=ON

`-DSLEEF_ENFORCE_SVE=ON` can be removed.

src/jdk.incubator.vector/linux/native/libvectormath/README line 41:

> 39: 
> 40: Currently, the only necessary change is:
> 41: * make `Sleef_rempitabdp` and `Sleef_rempitabsp` in sleefinline_advsimd.h and sleefinline_sve.h `static` to avoid multiple definitions.

These lines can be removed now.

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Marked as reviewed by mli (Reviewer).

PR Review: https://git.openjdk.org/jdk/pull/19185#pullrequestreview-2158620004
PR Review Comment: https://git.openjdk.org/jdk/pull/19185#discussion_r1665522936
PR Review Comment: https://git.openjdk.org/jdk/pull/19185#discussion_r1665523304