[jdk17u-dev] RFR: 8303279: C2: crash in SubTypeCheckNode::sub() at IGVN split if

[Ben Taylor]

On Thu, 13 Jul 2023 21:44:45 GMT, Ben Taylor <btaylor at openjdk.org> wrote:

> Backport is nearly clean, because https://bugs.openjdk.org/browse/JDK-8275201 has not been backported.
> Only context lines in `src/hotspot/share/opto/subtypenode.cpp` differ, the assert itself is unmodified.

The failed test `gc/metaspace/TestMetaspacePerfCounters.java#id3` on mac in the previous iteration appears to have been flaky or an infra issue. It passed on retry, and the new failure seems to be an infrastructure issue in riscv64. As mentioned on https://bugs.openjdk.org/browse/JDK-8303279 I've tested this change locally and it passes both the included test and jtregs tier 1 through 4.

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PR Comment: https://git.openjdk.org/jdk17u-dev/pull/1580#issuecomment-1644590968