src/hotspot/cpu/x86/vm_version_x86.cpp

*** 746,756 ****
                 (supports_bmi1() ? ", bmi1" : ""),
                 (supports_bmi2() ? ", bmi2" : ""),
                 (supports_adx() ? ", adx" : ""),
                 (supports_evex() ? ", evex" : ""),
                 (supports_sha() ? ", sha" : ""),
!                (supports_fma() ? ", fma" : ""));
    _features_string = os::strdup(buf);
  
    // UseSSE is set to the smaller of what hardware supports and what
    // the command line requires.  I.e., you cannot set UseSSE to 2 on
    // older Pentiums which do not support it.
--- 746,759 ----
                 (supports_bmi1() ? ", bmi1" : ""),
                 (supports_bmi2() ? ", bmi2" : ""),
                 (supports_adx() ? ", adx" : ""),
                 (supports_evex() ? ", evex" : ""),
                 (supports_sha() ? ", sha" : ""),
!                (supports_fma() ? ", fma" : ""),
!                (supports_vbmi2() ? ", vbmi2" : ""),
!                (supports_vaes() ? ", vaes" : ""),
!                (supports_vnni() ? ", vnni" : ""));
    _features_string = os::strdup(buf);
  
    // UseSSE is set to the smaller of what hardware supports and what
    // the command line requires.  I.e., you cannot set UseSSE to 2 on
    // older Pentiums which do not support it.
*** 1427,1436 ****
--- 1430,1449 ----
    } else if (UseBMI2Instructions) {
      warning("BMI2 instructions are not available on this CPU (AVX is also required)");
      FLAG_SET_DEFAULT(UseBMI2Instructions, false);
    }
  
+   // To enable VBMI2 we require that processor supports it and also that EVEX encoding is supported and enabled.
+   if (supports_vbmi2() && UseAVX > 2) {
+     if (FLAG_IS_DEFAULT(UseVBMI2)) {
+       UseVBMI2 = true;
+     }
+   } else if (UseVBMI2) {
+     warning("VBMI2 instructions are not available on this CPU");
+     FLAG_SET_DEFAULT(UseVBMI2, false);
+   }
+ 
    // Use population count instruction if available.
    if (supports_popcnt()) {
      if (FLAG_IS_DEFAULT(UsePopCountInstruction)) {
        UsePopCountInstruction = true;
      }