Integrated: 8317572: C2 SuperWord: refactor/improve TraceSuperWord, replace VectorizeDebugOption with TraceAutoVectorization

[Emanuel Peter]

On Fri, 26 Jan 2024 12:49:50 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

> Subtask of https://github.com/openjdk/jdk/pull/16620
> 
> I got approval to remove VectorizeDebugOption: [JDK-8320668](https://bugs.openjdk.org/browse/JDK-8320668)
> 
> I want a more general flag for AutoVectorization, that can trace different components of AutoVectorization.
> It should be a CompileCommand, so that it can select which methods it traces for.
> 
> TraceSuperWord should still look similar, and select a subset of the TraceAutoVectorization components (those for SuperWord), but still apply to all classes/methods.
> 
> With more refactoring later in [JDK-8315361](https://bugs.openjdk.org/browse/JDK-8315361), this flag should become more usable and interpretable. Especially, the idea is that different components of the `VLoop / VLoopAnalyzer` can have tracing enabled / disabled.
> 
> **How to use the flag:**
> Get "help", i.e. see all available tags:
> `./java -Xcomp -XX:CompileCommand=TraceAutoVectorization,*::*,help --version`
> 
> See "rejections" (i.e. failures where we don't vectorize) and successes (using TraceNewVectors):
> `./java -Xcomp -XX:CompileCommand=TraceAutoVectorization,*::*,SW_REJECTIONS -XX:+TraceNewVectors --version`
> The results are currently underwhealming. I will have to track many more failures, and I will do that with the bigger refactoring, when I move around the code and require error code returning everywhere, and then I can use that error code for printing.

This pull request has now been integrated.

Changeset: 3066d49c
Author:    Emanuel Peter <epeter at openjdk.org>
URL:       https://git.openjdk.org/jdk/commit/3066d49cc1910bb9ed01558582fdeb2385c484c3
Stats:     546 lines in 14 files changed: 402 ins; 81 del; 63 mod

8317572: C2 SuperWord: refactor/improve TraceSuperWord, replace VectorizeDebugOption with TraceAutoVectorization

Reviewed-by: chagedorn, kvn

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PR: https://git.openjdk.org/jdk/pull/17586