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  1. JDK
  2. JDK-8255437

[vector] jdk/incubator/vector/SelectFromByteMaxVectorTests fails with Arm SVE 2048-bits

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    • Subcomponent:
    • CPU:
      aarch64
    • OS:
      linux

      Description

      "jdk/incubator/vector/SelectFromByteMaxVectorTests" and "jdk/incubator/vector/SelectFromByteMaxVectorTestsMaskedSmokeTest" fail with IndexOutOfBoundsException on Arm SVE 2048-bits:

      test ByteMaxVectorTests.SelectFromByteMaxVectorTests(byte[-i * 5], shuffle[random]): failure
      java.lang.IndexOutOfBoundsException: required an index in [0..255] but found -66
          at jdk.incubator.vector/jdk.incubator.vector.AbstractShuffle.checkIndexFailed(AbstractShuffle.java:288)
          at jdk.incubator.vector/jdk.incubator.vector.AbstractShuffle.checkIndexes(AbstractShuffle.java:187)
          at jdk.incubator.vector/jdk.incubator.vector.ByteVector.rearrangeTemplate(ByteVector.java:2091)
          at jdk.incubator.vector/jdk.incubator.vector.ByteMaxVector.rearrange(ByteMaxVector.java:469)
          at jdk.incubator.vector/jdk.incubator.vector.ByteMaxVector.rearrange(ByteMaxVector.java:43)
          at jdk.incubator.vector/jdk.incubator.vector.ByteVector.selectFromTemplate(ByteVector.java:2210)
          at jdk.incubator.vector/jdk.incubator.vector.ByteMaxVector.selectFrom(ByteMaxVector.java:497)
          at jdk.incubator.vector/jdk.incubator.vector.ByteMaxVector.selectFrom(ByteMaxVector.java:43)
          at ByteMaxVectorTests.SelectFromByteMaxVectorTests(ByteMaxVectorTests.java:5039)
          at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
          at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
          at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
          at java.base/java.lang.reflect.Method.invoke(Method.java:564)
          at org.testng.internal.MethodInvocationHelper.invokeMethod(MethodInvocationHelper.java:85)
          at org.testng.internal.Invoker.invokeMethod(Invoker.java:639)
          at org.testng.internal.Invoker.invokeTestMethod(Invoker.java:821)
          at org.testng.internal.Invoker.invokeTestMethods(Invoker.java:1131)
          at org.testng.internal.TestMethodWorker.invokeTestMethods(TestMethodWorker.java:125)
          at org.testng.internal.TestMethodWorker.run(TestMethodWorker.java:108)
          at org.testng.TestRunner.privateRun(TestRunner.java:773)
          at org.testng.TestRunner.run(TestRunner.java:623)
          at org.testng.SuiteRunner.runTest(SuiteRunner.java:357)
          at org.testng.SuiteRunner.runSequentially(SuiteRunner.java:352)
          at org.testng.SuiteRunner.privateRun(SuiteRunner.java:310)
          at org.testng.SuiteRunner.run(SuiteRunner.java:259)
          at org.testng.SuiteRunnerWorker.runSuite(SuiteRunnerWorker.java:52)
          at org.testng.SuiteRunnerWorker.run(SuiteRunnerWorker.java:86)
          at org.testng.TestNG.runSuitesSequentially(TestNG.java:1185)
          at org.testng.TestNG.runSuitesLocally(TestNG.java:1110)
          at org.testng.TestNG.run(TestNG.java:1018)
          at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:94)
          at com.sun.javatest.regtest.agent.TestNGRunner.main(TestNGRunner.java:54)
          at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
          at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:64)
          at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
          at java.base/java.lang.reflect.Method.invoke(Method.java:564)
          at com.sun.javatest.regtest.agent.MainWrapper$MainThread.run(MainWrapper.java:127)
          at java.base/java.lang.Thread.run(Thread.java:832)

      The main reason is: for 2048-bits, the max vector length for byte is "2048 / 8 = 256" which is out of the byte range "-128 ~ 127". The above cases do the shuffles with a random index in the range [0, 256), and the index value will be saved to a byte array. For indexes that above "127", their actual values are negative. So the valid lane elements for API "selectFrom" should be 0 ~ 127 for bytes, it's better to limit the indexes in the tests.

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              Assignee:
              xgong Xiaohong Gong
              Reporter:
              xgong Xiaohong Gong
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                Updated:
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