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changeset 12297:586fa1919a89

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8014911: Should use SUPPORTS_NATIVE_CX8 define to help C/C++ compiler elide blocks of code Summary: If SUPPORTS_NATIVE_CX8 true then supports_cx8() function hard coded to return 'true' Reviewed-by: kvn, twisti, dholmes
author bpittore
date Fri, 20 Sep 2013 15:06:23 -0400
parents 10efeefa6485
children 504d8f519adf d68894a09c7c
files src/share/vm/runtime/vm_version.hpp
diffstat 1 files changed, 7 insertions(+), 1 deletions(-) [+]
line wrap: on
line diff
--- a/src/share/vm/runtime/vm_version.hpp	Fri Sep 13 21:36:27 2013 -0400
+++ b/src/share/vm/runtime/vm_version.hpp	Fri Sep 20 15:06:23 2013 -0400
@@ -78,7 +78,13 @@
   static const char* jre_release_version();
 
   // does HW support an 8-byte compare-exchange operation?
-  static bool supports_cx8()  {return _supports_cx8;}
+  static bool supports_cx8()  {
+#ifdef SUPPORTS_NATIVE_CX8
+    return true;
+#else
+    return _supports_cx8;
+#endif
+  }
   // does HW support atomic get-and-set or atomic get-and-add?  Used
   // to guide intrinsification decisions for Unsafe atomic ops
   static bool supports_atomic_getset4()  {return _supports_atomic_getset4;}