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

[Feilong Jiang]

On Thu, 1 Dec 2022 14:05:52 GMT, Fei Yang <fyang 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 reasonable to me. Thanks.

@RealFYang @chhagedorn  -- Thanks for looking at this.

-------------

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