Mercurial > hg > graal-jvmci-8

diff src/cpu/x86/vm/vm_version_x86.cpp @ 6795:7eca5de9e0b6

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7023898: Intrinsify AtomicLongFieldUpdater.getAndIncrement() Summary: use shorter instruction sequences for atomic add and atomic exchange when possible. Reviewed-by: kvn, jrose
author roland
date Thu, 20 Sep 2012 16:49:17 +0200
parents 8ae8f9dd7099
children a3ecd773a7b9
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line diff
--- a/src/cpu/x86/vm/vm_version_x86.cpp	Wed Sep 19 16:50:26 2012 -0700
+++ b/src/cpu/x86/vm/vm_version_x86.cpp	Thu Sep 20 16:49:17 2012 +0200
@@ -363,6 +363,11 @@
   }
 
   _supports_cx8 = supports_cmpxchg8();
+  // xchg and xadd instructions
+  _supports_atomic_getset4 = true;
+  _supports_atomic_getadd4 = true;
+  LP64_ONLY(_supports_atomic_getset8 = true);
+  LP64_ONLY(_supports_atomic_getadd8 = true);
 
 #ifdef _LP64
   // OS should support SSE for x64 and hardware should support at least SSE2.