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  1. JDK
  2. JDK-8234610

MaxVectorSize set wrongly when UseAVX=3 is specified after JDK-8221092

    Details

    • Subcomponent:
    • Introduced In Version:
      14
    • Resolved In Build:
      b25
    • CPU:
      x86
    • OS:
      generic
    • Verification:
      Not verified

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        Description

        On Skylake platform the JVM by default sets the UseAVX level to 2 and accordingly sets MaxVectorSize to 32 bytes as per JDK-8221092.
        When the user explicitly want to use AVX3 on skylake platform they need to invoke the JVM with -XX:UseAVX=3 command line argument. This should aumatically result in MaxVectorSize being set to 64 bytes. However post JDK-8221092, when -XX:UseAVX=3 is given on command line, the MaxVectorSize is being wrongly set to 16 bytes.

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                • Assignee:
                  sviswanathan Sandhya Viswanathan
                  Reporter:
                  sviswanathan Sandhya Viswanathan
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                  • Created:
                    Updated:
                    Resolved: