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  1. JDK
  2. JDK-8148175

C1: G1 barriers don't preserve FP registers

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    • b114
    • Verified

        I have a code which looks like:
            public void go() {
                final float FINAL = getValue();
                for (...) {
                     if (FINAL != getValue()) {
                         System.out.println("FAIL");
                     }
                }
             }
             float getValue() {
                 return 6;
             }

        Being run with G1 and -Xcomp the value of the FINAL variable may change...

        The source is attached.
        # java -Xmx300m -XX:+UseG1GC -Xmixed TestFinalFloat
        Final value: 6.0
        Still passed
        Still passed
        Still passed
        Final values has changed: -8.532477E32
        TEST FAILED

          1. TestFinalFloat.java
            2 kB

              vlivanov Vladimir Ivanov
              dfazunen Dmitry Fazunenko (Inactive)
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                Created:
                Updated:
                Resolved: