RFR: 8255351: Add detection for Graviton 1 & 2 CPUs

[Vladimir Kozlov]

On Thu, 19 Nov 2020 12:39:47 GMT, Evgeny Astigeevich <github.com+42899633+eastig at openjdk.org> wrote:

> This commit adds detection for Graviton 1 (as Cortex-A72) and for Graviton 2 (as Neoverse N1) and enables UseSIMDForMemoryOps for them.
> 
> The patch passed jtreg tier1-2 and all gtest tests with linux-aarch64-server-release build.

src/hotspot/cpu/aarch64/vm_version_aarch64.cpp line 169:

> 167:   if (_cpu == CPU_ARM && (_model == 0xd08 || _model2 == 0xd08)) {
> 168:     if (FLAG_IS_DEFAULT(UseSIMDForMemoryOps)) {
> 169:       FLAG_SET_DEFAULT(UseSIMDForMemoryOps, true);

What about A73? Should this flag be true for it too?

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PR: https://git.openjdk.java.net/jdk/pull/1315