RFR: 8241503: C2: Share MacroAssembler between mach nodes during code emission [v2]

[Vladimir Kozlov]

On Tue, 7 Jun 2022 23:49:09 GMT, Cesar Soares <duke at openjdk.java.net> wrote:

>> Hi there, can I please get some reviews on this change? The patch is to make the code reuse the same C2_MacroAssembler object during the emission of CPU instructions of a given compilation.
>> 
>> As you'll see the change affects all backends. I've done my best to keep the changes minimal/simple.
>> 
>> I tested this locally on Linux x86_64, x86_32 and MacOS Arm32, and ARM64.
>> 
>> **I need help testing the changes on PPC, S390, and RISCV**. I cross-compiled the JVM locally and the builds are all succeeding, but I couldn't use an emulator (yet) or any real hardware (no access to one) to test the changes on these platforms. I see that GitHub actions do some tests on S390 and PPC but the tests seem to not be extensive.
>> 
>> Thanks in advance,
>> Cesar
>
> Cesar Soares has updated the pull request incrementally with one additional commit since the last revision:
> 
>   fix last minute typo

Nice work. I think we can target this for JDK 20. Please, update it to latest JDK - there are conflicts.

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PR: https://git.openjdk.java.net/jdk/pull/9074