src/cpu/x86/vm/vm_version_x86.hpp

*** 550,559 ****
--- 550,572 ----
          if (_cpuid_info.ymm_save[i] != ymm_test_value()) {
            retVal = false;
            break;
          }
        }
+       // zmm_save will be set on a EVEX enabled machine even if we choose AVX code gen
+       if (retVal == false) {
+         // Verify that OS save/restore all bits of EVEX registers
+         // during signal processing.
+         int nreg = 2 LP64_ONLY(+2);
+         retVal = true;
+         for (int i = 0; i < 16 * nreg; i++) { // 64 bytes per zmm register
+           if (_cpuid_info.zmm_save[i] != ymm_test_value()) {
+             retVal = false;
+             break;
+           }
+         }
+       }
      }
      return retVal;
    }
  
    static void get_processor_features();
*** 704,713 ****
--- 717,728 ----
    static bool supports_avx512cd() { return (_cpuFeatures & CPU_AVX512CD) != 0; }
    static bool supports_avx512bw() { return (_cpuFeatures & CPU_AVX512BW) != 0; }
    static bool supports_avx512vl() { return (_cpuFeatures & CPU_AVX512VL) != 0; }
    static bool supports_avx512vlbw() { return (supports_avx512bw() && supports_avx512vl()); }
    static bool supports_avx512novl() { return (supports_evex() && !supports_avx512vl()); }
+   static bool supports_avx512nobw() { return (supports_evex() && !supports_avx512bw()); }
+   static bool supports_avx256only() { return (supports_avx2() && !supports_evex()); }
    // Intel features
    static bool is_intel_family_core() { return is_intel() &&
                                         extended_cpu_family() == CPU_FAMILY_INTEL_CORE; }
  
    static bool is_intel_tsc_synched_at_init()  {