RFR: 8370196: C2: Improve (U)MulHiLNode::MulHiValue [v4]

[Emanuel Peter]

On Mon, 17 Nov 2025 14:53:53 GMT, Zihao Lin <duke at openjdk.org> wrote:

>> If nodes both are constant, support constant folding.
>
> Zihao Lin has updated the pull request incrementally with one additional commit since the last revision:
> 
>   Add Math to Operations.java

test/hotspot/jtreg/compiler/lib/template_framework/library/Operations.java line 252:

> 250:         ops.add(Expression.make(LONGS, "Math.unsignedMultiplyHigh(", LONGS, ",", LONGS, ")"));
> 251: 
> 252:         // TODO: other classes.

Suggestion:

        // TODO: rest of Math and other classes.

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PR Review Comment: https://git.openjdk.org/jdk/pull/28097#discussion_r2538606463