[jdk8u-dev] RFR: 8202952: C2: Unexpected dead nodes after matching

[Severin Gehwolf]

On Fri, 24 Mar 2023 07:57:45 GMT, Dongbo He <dongbohe at openjdk.org> wrote:

> I would like to backport this patch to fix crash during C2 compilation. 
> 
> This patch doesn't apply cleanly due to context differences, and
> I selected fuzzer tests from Fei Yang because the tests in the original commit cannot be reproduced on JDK8u.
> 
> Performed hotspot jtreg test on linux x86-64 platforms with -Xcomp options, new test fails without product change and passes with it.

If I'm not mistaken, then this patch applies to shared code, right? The [JDK 11 version](https://hg.openjdk.org/jdk-updates/jdk11u/rev/6ad83ea7dda7) did not, since it's in file `src/hotspot/cpu/x86/x86.ad` there. Thus, architecture specific (x86). Has this been tested on various architecture combinations (aarch64, ppc64le)? Am I missing something?

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PR Review: https://git.openjdk.org/jdk8u-dev/pull/291#pullrequestreview-1392630595