RFR: 8326983: Unused operands reported after JDK-8326135 [v2]

[kuaiwei]

On Fri, 1 Mar 2024 21:05:11 GMT, Vladimir Kozlov <kvn at openjdk.org> wrote:

> My testing shows that when we do **cross compilation** on linux-x64 I got:
> 
> ```
> Warning: unused operand (no_rax_RegP)
> ```
> 
> Normal linux-x64 build passed.
> 
> The operand is used only in one place in ZGC barriers code: `src/hotspot/cpu/x86/gc/z/z_x86_64.ad` May be it is not include during cross compilation.

Does the cross compilation disable zgc feature? In my test, it's used by zgc and no warning about it.

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PR Comment: https://git.openjdk.org/jdk/pull/18075#issuecomment-1976329450