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  1. JDK
  2. JDK-8148175

C1: G1 barriers don't preserve FP registers

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      Description

        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

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            backported by

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8208873 C1: G1 barriers don't preserve FP registers

            • P2 - Crashes, loss of data, severe memory leak.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8216693 C1: G1 barriers don't preserve FP registers

            • P2 - Crashes, loss of data, severe memory leak.
            • Resolved

            Backport - A issue that is required to port a Bug or Feature into another product release. This issue type is generally associated with the main Bug/Feature to represent each individual release of the port. JDK-8152757 C1: G1 barriers don't preserve FP registers

            • P2 - Crashes, loss of data, severe memory leak.
            • Closed
            duplicates

            Bug - A problem which impairs or prevents the functions of the product. JDK-8186112 Using G1 Garbage Collector causes in use variable to be cleared

            • P2 - Crashes, loss of data, severe memory leak.
            • Closed

            Bug - A problem which impairs or prevents the functions of the product. JDK-8165766 TieredCompilation will change primitive autoboxing value on loop method call occasionally

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Closed
            relates to

            Bug - A problem which impairs or prevents the functions of the product. JDK-8153194 [TEST_BUG] PreserveFPRegistersTest.java runs out of memory in the nightlies

            • P3 - Major loss of function.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8161085 PreserveFPRegistersTest fails with 'AssertionError: Final value has changed'

            • P3 - Major loss of function.
            • Resolved

            Bug - A problem which impairs or prevents the functions of the product. JDK-8152168 SumRedSqrt_Double.java fails with "Invalid sum of elements"

            • P2 - Crashes, loss of data, severe memory leak.
            • Closed

            Bug - A problem which impairs or prevents the functions of the product. JDK-8165766 TieredCompilation will change primitive autoboxing value on loop method call occasionally

            • P4 - Minor loss of function, or other problem where easy workaround is present.
            • Closed

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