RFR: JDK-8277178: Reduce the priority of data dependent nodes when OptoScheduling enabled [v6]

[SUN Guoyun]

On Wed, 19 Jan 2022 19:01:43 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> On other hand I see more variations on Aarch64

regression?
At present, Theoretically, instruction reordering may  prolongs live range and lead to spilling on stack, But I can't find the spill code caused by register pressure caused by this patch at present. This patch only makes local instructions reorder in the block, and it is estimated that it has little effect on the register pressure. I'm not quite sure.

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PR: https://git.openjdk.java.net/jdk/pull/6407