[llvm-commits] [llvm] r73777 - /llvm/trunk/include/llvm/Support/ManagedStatic.h

[Owen Anderson]

Author: resistor
Date: Fri Jun 19 12:50:11 2009
New Revision: 73777

URL: http://llvm.org/viewvc/llvm-project?rev=73777&view=rev
Log:
Fences are expensive.  Avoid doing them when we're not in multithreaded mode.

Modified:
    llvm/trunk/include/llvm/Support/ManagedStatic.h

Modified: llvm/trunk/include/llvm/Support/ManagedStatic.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/Support/ManagedStatic.h?rev=73777&r1=73776&r2=73777&view=diff

==============================================================================
--- llvm/trunk/include/llvm/Support/ManagedStatic.h (original)
+++ llvm/trunk/include/llvm/Support/ManagedStatic.h Fri Jun 19 12:50:11 2009
@@ -61,28 +61,28 @@
   // Accessors.
   C &operator*() {
     void* tmp = Ptr;
-    sys::MemoryFence();
+    if (llvm_is_multithreaded()) sys::MemoryFence();
     if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>);
 
     return *static_cast<C*>(Ptr);
   }
   C *operator->() {
     void* tmp = Ptr;
-    sys::MemoryFence();
+    if (llvm_is_multithreaded()) sys::MemoryFence();
     if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>);
 
     return static_cast<C*>(Ptr);
   }
   const C &operator*() const {
     void* tmp = Ptr;
-    sys::MemoryFence();
+    if (llvm_is_multithreaded()) sys::MemoryFence();
     if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>);
 
     return *static_cast<C*>(Ptr);
   }
   const C *operator->() const {
     void* tmp = Ptr;
-    sys::MemoryFence();
+    if (llvm_is_multithreaded()) sys::MemoryFence();
     if (!tmp) RegisterManagedStatic(object_creator<C>, object_deleter<C>);
 
     return static_cast<C*>(Ptr);