[llvm-commits] [llvm] r74004 - in /llvm/trunk: include/llvm/System/Atomic.h lib/System/Atomic.cpp

[Owen Anderson]

Author: resistor
Date: Tue Jun 23 16:19:04 2009
New Revision: 74004

URL: http://llvm.org/viewvc/llvm-project?rev=74004&view=rev
Log:
Add atomic multiply and divide operations, built on top of CompareAndSwap.

Modified:
    llvm/trunk/include/llvm/System/Atomic.h
    llvm/trunk/lib/System/Atomic.cpp

Modified: llvm/trunk/include/llvm/System/Atomic.h
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/include/llvm/System/Atomic.h?rev=74004&r1=74003&r2=74004&view=diff

==============================================================================
--- llvm/trunk/include/llvm/System/Atomic.h (original)
+++ llvm/trunk/include/llvm/System/Atomic.h Tue Jun 23 16:19:04 2009
@@ -27,6 +27,8 @@
     cas_flag AtomicIncrement(volatile cas_flag* ptr);
     cas_flag AtomicDecrement(volatile cas_flag* ptr);
     cas_flag AtomicAdd(volatile cas_flag* ptr, cas_flag val);
+    cas_flag AtomicMul(volatile cas_flag* ptr, cas_flag val);
+    cas_flag AtomicDiv(volatile cas_flag* ptr, cas_flag val);
   }
 }
 

Modified: llvm/trunk/lib/System/Atomic.cpp
URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/System/Atomic.cpp?rev=74004&r1=74003&r2=74004&view=diff

==============================================================================
--- llvm/trunk/lib/System/Atomic.cpp (original)
+++ llvm/trunk/lib/System/Atomic.cpp Tue Jun 23 16:19:04 2009
@@ -91,4 +91,22 @@
 #endif
 }
 
+sys::cas_flag sys::AtomicMul(volatile sys::cas_flag* ptr, sys::cas_flag val) {
+  sys::cas_flag original, result;
+  do {
+    original = *ptr;
+    result = original * val;
+  } while (sys::CompareAndSwap(ptr, result, original) != original);
 
+  return result;
+}
+
+sys::cas_flag sys::AtomicDiv(volatile sys::cas_flag* ptr, sys::cas_flag val) {
+  sys::cas_flag original, result;
+  do {
+    original = *ptr;
+    result = original / val;
+  } while (sys::CompareAndSwap(ptr, result, original) != original);
+
+  return result;
+}