RFR: 8254827: JVMCI: Enable it for Windows+AArch64

Mon Oct 19 11:06:14 UTC 2020

On Thu, 15 Oct 2020 15:00:47 GMT, Bernhard Urban-Forster <burban at openjdk.org> wrote:

> Use r18 as allocatable register on Linux only.
> 
> A bootstrap works now (it has been crashing before due to r18 being allocated):
> $
> ./windows-aarch64-server-fastdebug/bin/java.exe -XX:+UnlockExperimentalVMOptions -XX:+UseJVMCICompiler -XX:+BootstrapJVMCI -version
> Bootstrapping JVMCI................................. in 17990 ms (compiled 3330 methods)
> openjdk version "16-internal" 2021-03-16
> OpenJDK Runtime Environment (fastdebug build 16-internal+0-adhoc.NORTHAMERICAbeurba.openjdk-jdk)
> OpenJDK 64-Bit Server VM (fastdebug build 16-internal+0-adhoc.NORTHAMERICAbeurba.openjdk-jdk, mixed mode)
> 
> Jtreg tests `test/hotspot/jtreg/compiler/jvmci` are passing as well.

Build changes look good, but you'll need a review on the hotspot part as well.

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Marked as reviewed by ihse (Reviewer).

PR: https://git.openjdk.java.net/jdk/pull/685