[jdk11u-dev] RFR: 8256215: Shenandoah: re-organize saving/restoring machine state in assembler code

[Aleksey Shipilev]

On Thu, 8 Jul 2021 16:19:43 GMT, Aleksey Shipilev <shade at openjdk.org> wrote:

> This improves Shenandoah support on x86_32. There were numerous failures on lower `UseSSE` modes, which this patch is supposed to fix. The notable differences from the upstream is the absence of LRB-native code, which does not exist in 11u. Ditto for nmethod barriers that also do not exist in 11u.
> 
> Additional testing:
>  - [x] Linux x86_64 fastdebug `hotspot_gc_shenandoah`
>  - [x] Linux x86_64 fastdebug `tier1` with Shenandoah
>  - [x] Linux x86_32 fastdebug `hotspot_gc_shenandoah` with default, SSE=1, SSE=2
>  - [x] Linux x86_32 fastdebug `tier1` with Shenandoah default, SSE=1, SSE=2
>  - [x] Linux x86_32 fastdebug `tier2` with Shenandoah default, SSE=1, SSE=2

Friendly reminder. @rkennke, @zhengyu123?

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PR: https://git.openjdk.java.net/jdk11u-dev/pull/111