RFR: 8288445: AArch64: C2 compilation fails with guarantee(!true || (true && (shift != 0))) failed: impossible encoding

[Dean Long]

On Mon, 20 Jun 2022 06:28:54 GMT, Hao Sun <haosun at openjdk.org> wrote:

> Instead of introducing immI_positive, I wonder if we can generate orr dst src for zero shift count, just as the SVE part does

I considered using left-shift by 0, but I don't think it's worth it to optimize this case in the back-end.  If we really want to optimize shift by 0, I think it should be done in the front-end.

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PR: https://git.openjdk.org/jdk19/pull/40