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8014911: Should use SUPPORTS_NATIVE_CX8 define to help C/C++ compiler elide blocks of code

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If SUPPORTS_NATIVE_CX8 true then supports_cx8() function hard coded to return 'true'

Reviewed-by: kvn, twisti, dholmes
This commit is contained in:
Bill Pittore 2013-09-20 15:06:23 -04:00
parent 7b2ffab30e
commit 3f2082ef80
1 changed files with 7 additions and 1 deletions
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8
hotspot/src/share/vm/runtime/vm_version.hpp
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@ -78,7 +78,13 @@ class Abstract_VM_Version: AllStatic {
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;}