[11u] RFR (XS) 8262465: Very long compilation times and high memory consumption in C2 debug builds

[Hohensee, Paul]

The check for (!liveout->is_empty()) comes from https://bugs.openjdk.java.net/browse/JDK-8234003. Backport that first? Not strictly necessary because it's minor optimizations and format changes, but makes the 11u code closer to tip in case of future backports.

Thanks,
Paul

-----Original Message-----
From: jdk-updates-dev <jdk-updates-dev-retn at openjdk.java.net> on behalf of Aleksey Shipilev <shade at redhat.com>
Date: Tuesday, April 6, 2021 at 4:05 AM
To: "jdk-updates-dev at openjdk.java.net" <jdk-updates-dev at openjdk.java.net>
Subject: [11u] RFR (XS) 8262465: Very long compilation times and high memory consumption in C2 debug builds

Original bug:
   https://bugs.openjdk.java.net/browse/JDK-8262465
   https://git.openjdk.java.net/jdk/commit/2da882c0

This effectively guards the verification block with C2 testing flag. Unfortunately, the patch does
not apply cleanly due to protected block being a bit different.

11u variant:
   https://cr.openjdk.java.net/~shade/8262465/webrev.11u.01/

Testing: tier{1,2}

--
Thanks,
-Aleksey