RFR: 8256479: [PPC64] C2 crashes when UseVectorByteReverseInstructionsPPC64 used without SuperwordUseVSX

Tue Nov 17 19:42:05 UTC 2020

On Tue, 17 Nov 2020 15:27:29 GMT, Martin Doerr <mdoerr at openjdk.org> wrote:

> C2 crashes on Power9 when using UseVectorByteReverseInstructionsPPC64 without SuperwordUseVSX. bytes_reverse_long_vecNode uses a Vector Register. See bug for more details.
> 
> The VectorConversion tests can detect the issue.

Marked as reviewed by jrziviani at github.com (no known OpenJDK username).

Hello @TheRealMDoerr, thank you for catching and fixing it.
The looks good and works great (tested in P9 and P10)
jdk/bin/java -XX:+UnlockDiagnosticVMOptions -XX:-SuperwordUseVSX -XX:+UseVectorByteReverseInstructionsPPC64 -version
OpenJDK 64-Bit Server VM warning: UseVectorByteReverseInstructionsPPC64 specified, but needs SuperwordUseVSX.

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PR: https://git.openjdk.java.net/jdk/pull/1262