src/cpu/x86/vm/vm_version_x86.cpp

*** 928,941 ****
          UseXmmI2D = true;
        } else {
          UseXmmI2D = false;
        }
      }
!     if( FLAG_IS_DEFAULT(UseSSE42Intrinsics) ) {
!       if( supports_sse4_2() && UseSSE >= 4 ) {
!         UseSSE42Intrinsics = true;
        }
      }
  
      // some defaults for AMD family 15h
      if ( cpu_family() == 0x15 ) {
        // On family 15h processors default is no sw prefetch
--- 928,946 ----
          UseXmmI2D = true;
        } else {
          UseXmmI2D = false;
        }
      }
!     if (supports_sse4_2() && UseSSE >= 4) {
!       if (FLAG_IS_DEFAULT(UseSSE42Intrinsics)) {
!         FLAG_SET_DEFAULT(UseSSE42Intrinsics, true);
!       }
!     } else {
!       if (UseSSE42Intrinsics && !FLAG_IS_DEFAULT(UseAESIntrinsics)) {
!         warning("SSE4.2 intrinsics require SSE4.2 instructions or higher. Intrinsics will be disabled.");
        }
+       FLAG_SET_DEFAULT(UseSSE42Intrinsics, false);
      }
  
      // some defaults for AMD family 15h
      if ( cpu_family() == 0x15 ) {
        // On family 15h processors default is no sw prefetch
*** 1005,1016 ****
            UseUnalignedLoadStores = true; // use movdqu on newest Intel cpus
          }
        }
        if (supports_sse4_2() && UseSSE >= 4) {
          if (FLAG_IS_DEFAULT(UseSSE42Intrinsics)) {
!           UseSSE42Intrinsics = true;
          }
        }
      }
      if ((cpu_family() == 0x06) &&
          ((extended_cpu_model() == 0x36) || // Centerton
           (extended_cpu_model() == 0x37) || // Silvermont
--- 1010,1026 ----
            UseUnalignedLoadStores = true; // use movdqu on newest Intel cpus
          }
        }
        if (supports_sse4_2() && UseSSE >= 4) {
          if (FLAG_IS_DEFAULT(UseSSE42Intrinsics)) {
!           FLAG_SET_DEFAULT(UseSSE42Intrinsics, true);
!         }
!       } else {
!         if (UseSSE42Intrinsics && !FLAG_IS_DEFAULT(UseAESIntrinsics)) {
!           warning("SSE4.2 intrinsics require SSE4.2 instructions or higher. Intrinsics will be disabled.");
          }
+         FLAG_SET_DEFAULT(UseSSE42Intrinsics, false);
        }
      }
      if ((cpu_family() == 0x06) &&
          ((extended_cpu_model() == 0x36) || // Centerton
           (extended_cpu_model() == 0x37) || // Silvermont