[Mono-bugs] [Bug 74639][Nor] New - instruction sync needed for atomic.h on ppc

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Changed by mass@akuma.org.

http://bugzilla.ximian.com/show_bug.cgi?id=74639

--- shadow/74639	2005-04-16 18:26:12.000000000 -0400
+++ shadow/74639.tmp.25679	2005-04-16 18:26:12.000000000 -0400
@@ -0,0 +1,28 @@
+Bug#: 74639
+Product: Mono: Runtime
+Version: 1.1
+OS: 
+OS Details: 
+Status: NEW   
+Resolution: 
+Severity: 
+Priority: Normal
+Component: JIT
+AssignedTo: mono-bugs@ximian.com                            
+ReportedBy: mass@akuma.org               
+QAContact: mono-bugs@ximian.com
+TargetMilestone: ---
+URL: 
+Cc: 
+Summary: instruction sync needed for atomic.h on ppc
+
+More fixes for atomic.h on ppc.
+
+
+The upcoming patch includes the changes suggested on the mailing list Wednesday (April 13th), as 
+well as addition of an isync call at the end of all the assembly routines.
+
+I believe this isync is neccessary - while the __volatile__ marker will prevent the assembly block 
+from being reordered with respect to other code by the compiler, the processor itself may still 
+reorder the execution of the instructions, for example executing branch prediction around the value 
+read from a refcount before that value has been successfully written to memory.