RFR: 8299975: Limit underflow protection CMoveINode in PhaseIdealLoop::do_unroll must also protect type from underflow [v4]

[Emanuel Peter]

On Fri, 20 Jan 2023 11:16:38 GMT, Christian Hagedorn <chagedorn at openjdk.org> wrote:

>> test/hotspot/jtreg/compiler/loopopts/TestCMoveLimitType.java line 31:
>> 
>>> 29:  *                   -XX:CompileCommand=compileonly,compiler.loopopts.TestCMoveLimitType::test*
>>> 30:  *                   -XX:CompileCommand=dontinline,compiler.loopopts.TestCMoveLimitType::dontInline
>>> 31:  *                   -XX:RepeatCompilation=50 -XX:+StressIGVN
>> 
>> You could also remove `RepeatCompilation` here and in the run below. If there is a problem at some point, we would eventually catch it by re-executing the test over and over again in our testing due to having a different seed each time.
>
> Maybe you can also add `@key stress randomness`.

Ok, added the keywords, but will leave the `RepeatCompilation`.

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

PR: https://git.openjdk.org/jdk/pull/12092