src/cpu/x86/vm/vm_version_x86.cpp

rev 743 : [mq]: 6823354

*** 282,292 ****
      // HT processor could be installed on a system which doesn't support HT.
      _cpuFeatures &= ~CPU_HT;
    }
  
    char buf[256];
!   jio_snprintf(buf, sizeof(buf), "(%u cores per cpu, %u threads per core) family %d model %d stepping %d%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
                 cores_per_cpu(), threads_per_core(),
                 cpu_family(), _model, _stepping,
                 (supports_cmov() ? ", cmov" : ""),
                 (supports_cmpxchg8() ? ", cx8" : ""),
                 (supports_fxsr() ? ", fxsr" : ""),
--- 282,292 ----
      // HT processor could be installed on a system which doesn't support HT.
      _cpuFeatures &= ~CPU_HT;
    }
  
    char buf[256];
!   jio_snprintf(buf, sizeof(buf), "(%u cores per cpu, %u threads per core) family %d model %d stepping %d%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s%s",
                 cores_per_cpu(), threads_per_core(),
                 cpu_family(), _model, _stepping,
                 (supports_cmov() ? ", cmov" : ""),
                 (supports_cmpxchg8() ? ", cx8" : ""),
                 (supports_fxsr() ? ", fxsr" : ""),
*** 299,308 ****
--- 299,309 ----
                 (supports_sse4_2() ? ", sse4.2" : ""),
                 (supports_popcnt() ? ", popcnt" : ""),
                 (supports_mmx_ext() ? ", mmxext" : ""),
                 (supports_3dnow()   ? ", 3dnow"  : ""),
                 (supports_3dnow2()  ? ", 3dnowext" : ""),
+                (supports_lzcnt()   ? ", lzcnt": ""),
                 (supports_sse4a()   ? ", sse4a": ""),
                 (supports_ht() ? ", ht": ""));
    _features_str = strdup(buf);
  
    // UseSSE is set to the smaller of what hardware supports and what
*** 362,371 ****
--- 363,379 ----
          UseXmmI2D = true;
        } else {
          UseXmmI2D = false;
        }
      }
+ 
+     // Use count leading zeros count instruction if available.
+     if (supports_lzcnt()) {
+       if (FLAG_IS_DEFAULT(UseCountLeadingZerosInstruction)) {
+         UseCountLeadingZerosInstruction = true;
+       }
+     }
    }
  
    if( is_intel() ) { // Intel cpus specific settings
      if( FLAG_IS_DEFAULT(UseStoreImmI16) ) {
        UseStoreImmI16 = false; // don't use it on Intel cpus