[LLVMbugs] [Bug 9851] llc -combiner-alias-analysis reorders volatiles

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=9851

Eli Friedman <sharparrow1 at yahoo.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|RESOLVED                    |REOPENED
         Resolution|INVALID                     |

--- Comment #3 from Eli Friedman <sharparrow1 at yahoo.com> 2011-05-06 01:54:35 CDT ---
(In reply to comment #2)
> As far as I know reordering volatiles is perfectly valid.  You need a memory
> barrier if you want to enforce ordering.

>From LangRef: "The optimizers must not change the number of volatile operations
or change their order of execution relative to other volatile operations."

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