RFR: 8300865: C2: product reduction in ProdRed_Double is not vectorized [v3]

Tue May 30 08:01:57 UTC 2023

On Thu, 25 May 2023 17:27:50 GMT, Sandhya Viswanathan <sviswanathan at openjdk.org> wrote:

>> @sviswa7 Thanks for taking care of this. Looks good, but let me run testing at commit 4. I will report back.
>
> Thanks a lot @eme64.

@sviswa7 testing to tier5 and stress testing looks good.

Out of curiosity: do you have a benchmark that shows a speedup with this change? Would be nice to add it.
Maybe we could start with a benchmark from  https://git.openjdk.org/jdk/pull/13056 and add some more compute-instructions to outweigh the latency of the reduction? Not sure if that is very easy.

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PR Comment: https://git.openjdk.org/jdk/pull/14065#issuecomment-1567951783