RFR: 8280126: C2: detect and remove dead irreducible loops [v3]

[Vladimir Kozlov]

On Fri, 13 Jan 2023 07:34:52 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

> Thus, the outer while-loop is not a loop, but just an if. Thus, all we have is an infinite irreducible loop, directly attached at the root.

Good point. I understand your comment now. Thanks!

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PR: https://git.openjdk.org/jdk/pull/11764