[aarch64-port-dev ] RFR(M): 8233743: AArch64: Make r27 conditionally allocatable

[Pengfei Li (Arm Technology China)]

Hi Andrew,

I just caught up with your discussion with Nick.

> I guess. It'd be nicer to fix CDS on AArch64 so that it doesn't cause
> performance regressions.

The 4G alignment search may still fail after the fix. Regarding to my second webrev, do you agree that checking the base and shift values in a function in aarch64.ad? See my last email [1] for detail explanations.

[1] https://mail.openjdk.java.net/pipermail/aarch64-port-dev/2019-November/008278.html

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Thanks,
Pengfei