src/cpu/aarch64/vm/vm_version_aarch64.cpp

*** 59,68 ****
--- 59,72 ----
  
  #ifndef HWCAP_CRC32
  #define HWCAP_CRC32 (1<<7)
  #endif
  
+ #ifndef HWCAP_ATOMICS
+ #define HWCAP_ATOMICS (1<<8)
+ #endif
+ 
  int VM_Version::_cpu;
  int VM_Version::_model;
  int VM_Version::_model2;
  int VM_Version::_variant;
  int VM_Version::_revision;
*** 170,179 ****
--- 174,184 ----
    if (auxv & HWCAP_ASIMD) strcat(buf, ", simd");
    if (auxv & HWCAP_CRC32) strcat(buf, ", crc");
    if (auxv & HWCAP_AES)   strcat(buf, ", aes");
    if (auxv & HWCAP_SHA1)  strcat(buf, ", sha1");
    if (auxv & HWCAP_SHA2)  strcat(buf, ", sha256");
+   if (auxv & HWCAP_ATOMICS) strcat(buf, ", lse");
  
    _features_string = os::strdup(buf);
  
    if (FLAG_IS_DEFAULT(UseCRC32)) {
      UseCRC32 = (auxv & HWCAP_CRC32) != 0;
*** 189,198 ****
--- 194,212 ----
    if (UseVectorizedMismatchIntrinsic) {
      warning("UseVectorizedMismatchIntrinsic specified, but not available on this CPU.");
      FLAG_SET_DEFAULT(UseVectorizedMismatchIntrinsic, false);
    }
  
+   if (auxv & HWCAP_ATOMICS) {
+     if (FLAG_IS_DEFAULT(UseLSE))
+       FLAG_SET_DEFAULT(UseLSE, true);
+   } else {
+     if (UseLSE) {
+       warning("UseLSE specified, but not supported on this CPU");
+     }
+   }
+ 
    if (auxv & HWCAP_AES) {
      UseAES = UseAES || FLAG_IS_DEFAULT(UseAES);
      UseAESIntrinsics =
          UseAESIntrinsics || (UseAES && FLAG_IS_DEFAULT(UseAESIntrinsics));
      if (UseAESIntrinsics && !UseAES) {