[aarch64-port-dev ] RFR: [8u] JDK-8211320: AArch64: unsafe.compareAndSetByte() and unsafe.compareAndSetShort() c2 intrinsics broken with negative expected value

[Andrew Dinn]

I was asked to look at backporting this patch to jdk8u-shenandoah.
However, I don't believe a backport is appropriate.

The patch updates ad file encodings and associated assembler cmpxchg
method code for rules that match CompareAndExchangeB/S and
CompareAndSwapB/S. Those cases do not apply to jdk8u where there are no
CompareAndExchange rules and CompareAndSwap rules are only defined for
I/L/N/P. I'm bery happy to be corrected if I am missing something.

regards,


Andrew Dinn
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