8311588: C2: RepeatCompilation compiler directive does not choose stress seed randomly

[elifaslan1]

Clean backport to make JDK-8319879 backporting cleaner. The compiler directive RepeatCompilation can be used to repeat compilations of specific methods, for example for Test::test():

-XX:CompileCommand=RepeatCompilation,Test::test,1000

When using this compiler directive in combination with StressIGVN/CCP/GCM/LCM, C2 only sets the stress seed once to a random value. Afterward, it keeps the seed for all repeated compilations. This should be changed to always select a random seed with each repetition (i.e. get the same behavior as the flag RepeatCompilation).

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Progress

• Change must not contain extraneous whitespace
• JDK-8311588 needs maintainer approval
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Issue

• JDK-8311588: C2: RepeatCompilation compiler directive does not choose stress seed randomly (Bug - P5 - Approved)

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8311588: C2: RepeatCompilation compiler directive does not choose stress seed randomly

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At the time when this comment was updated there had been 3 new commits pushed to the master branch:

• 6d2e15c: 8294314: Minimize disabled warnings in hotspot
• 8b2e9f5: 8327757: Convert javax/swing/JSlider/6524424/bug6524424.java applet to main
• 7a889a5: 8327856: Convert applet test SpanishDiacriticsTest.java to a main program

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This backport pull request has now been updated with issue from the original commit.

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Webrevs

• 00: Full (447542c9)

[elifaslan1]

/approval request Clean backport to make JDK-8319879 backporting cleaner. The compiler directive RepeatCompilation can be used to repeat compilations of specific methods, for example for Test::test():

-XX:CompileCommand=RepeatCompilation,Test::test,1000

When using this compiler directive in combination with StressIGVN/CCP/GCM/LCM, C2 only sets the stress seed once to a random value. Afterward, it keeps the seed for all repeated compilations. This should be changed to always select a random seed with each repetition (i.e. get the same behavior as the flag RepeatCompilation).

[openjdk]

@elifaslan1
8311588: The approval request has been created successfully.

[elifaslan1]

/integrate

[openjdk]

@elifaslan1
Your change (at version 447542c) is now ready to be sponsored by a Committer.