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Editorial Team
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Asked: 2026-05-23T11:24:56+00:00

I’d like to compare performance of an application across multiple SSE versions and have

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I’d like to compare performance of an application across multiple SSE versions and have been unable to find the values that are accepted by this JVM flag. I’m testing 0, 1, 3, and 4. I’m most unsure about if 4 is accepted (all examples I’ve seen are up to 3) and/or if it’s variations (4.1-4.3) can be explicitly defined. Does anyone have any further info on this?

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1 Answer

  1. Editorial Team

    Use the source 😉

    http://hg.openjdk.java.net/jdk8u/jdk8u/hotspot/file/39d920531a4d/src/cpu/x86/vm/vm_version_x86.cpp#l464

    if (UseSSE < 4) {
  _cpuFeatures &= ~CPU_SSE4_1;
  _cpuFeatures &= ~CPU_SSE4_2;
}

if (UseSSE < 3) {
  _cpuFeatures &= ~CPU_SSE3;
  _cpuFeatures &= ~CPU_SSSE3;
  _cpuFeatures &= ~CPU_SSE4A;
}

if (UseSSE < 2)
  _cpuFeatures &= ~CPU_SSE2;

if (UseSSE < 1)
  _cpuFeatures &= ~CPU_SSE;

    Note that proves the JVM is aware to some extent about SSE, it might not generate really effective codes for newer versions. Your mileage may vary.

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