[LLVMbugs] [Bug 16602] incorrect loop optimization at O2

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Thu Jul 11 15:23:46 PDT 2013


Richard Smith <richard-llvm at metafoo.co.uk> changed:

           What    |Removed                     |Added
             Status|REOPENED                    |RESOLVED
                 CC|                            |richard-llvm at metafoo.co.uk
         Resolution|---                         |INVALID

--- Comment #3 from Richard Smith <richard-llvm at metafoo.co.uk> ---
(In reply to comment #2)
> I can use global variables in this way if I don't care about race
> conditions.

False. Your code has a data race, and so has undefined behavior.

> The condition can be missed few times in the loop but eventually
> x will become 29 and the loop must exit.

False. The store to 'x' in 'set_x' is not guaranteed to ever become visible to

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