RFR: 8279508: Auto-vectorize Math.round API [v15]

[Quan Anh Mai]

On Mon, 21 Mar 2022 18:25:36 GMT, Jatin Bhateja <jbhateja at openjdk.org> wrote:

> A read from constant table will incur minimum of L1I access penalty to access code blob or at worst even more if data is not present in first level cache

But your approach comes at a cost of frontend bandwidth and port contention, which imo are more important than latency in this case since a constant load does not prolong dependency chains. A load has very good throughput so it is often performant unless the load depends on its input (the memory location or the registers used for address calculation). Thanks

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PR: https://git.openjdk.java.net/jdk/pull/7094