RFR: 8299960: Speed up test/hotspot/jtreg/compiler/c2/irTests/TestVectorizeURShiftSubword.java

[Tobias Hartmann]

On Wed, 11 Jan 2023 11:55:20 GMT, Emanuel Peter <epeter at openjdk.org> wrote:

> This is one of the most time-consuming compiler tests.
> On my machine, I was able to reduce it from `20 sec` to `3 sec`.
> 
> This is an irTest, so we basically only want to see if certain IR-nodes are present.
> By default we do lots of warmup iterations, this is not required in these examples, so I set `@Warmup(1)`.

Please use `-DWarmup`, see [README.md](https://github.com/openjdk/jdk/blob/master/test/hotspot/jtreg/compiler/lib/ir_framework/README.md).

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Changes requested by thartmann (Reviewer).

PR: https://git.openjdk.org/jdk/pull/11942