RFR: 8297953: Fix several C2 IR matching tests for RISC-V

[Christian Hagedorn]

On Thu, 1 Dec 2022 13:50:23 GMT, Feilong Jiang <fjiang at openjdk.org> wrote:

> Fix several IR matching tests that failed on RISC-V.
> 
> Rotate Node will be matched only when UseZbb is enabled:
> - test/hotspot/jtreg/compiler/c2/irTests/RotateLeftNodeIntIdealizationTests.java
> - test/hotspot/jtreg/compiler/c2/irTests/RotateLeftNodeLongIdealizationTests.java
> 
> RISC-V does not provide float branch instruction, so we do not match CMOVEI for two floating-point comparisons:
> - test/hotspot/jtreg/compiler/c2/irTests/TestFPComparison.java
> 
> Testing:
> - test/hotspot/jtreg/compiler/c2/irTests/TestFPComparison.java -- no tests selected as expected.
> 
> - With `-XX:+UseZbb`:
>   - test/hotspot/jtreg/compiler/c2/irTests/RotateLeftNodeIntIdealizationTests.java -- passed
>   - test/hotspot/jtreg/compiler/c2/irTests/RotateLeftNodeLongIdealizationTests.java -- passed
> 
> - With `-XX:-UseZbb`:
>   - test/hotspot/jtreg/compiler/c2/irTests/RotateLeftNodeIntIdealizationTests.java -- no tests selected as expected
>   - test/hotspot/jtreg/compiler/c2/irTests/RotateLeftNodeLongIdealizationTests.java -- no tests selected as expected

Looks good!

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Marked as reviewed by chagedorn (Reviewer).

PR: https://git.openjdk.org/jdk/pull/11453