[LLVMbugs] [Bug 22822] Aggressive optimization breaks the code and removes checks

[bugzilla-daemon at llvm.org]

http://llvm.org/bugs/show_bug.cgi?id=22822

David Blaikie <dblaikie at gmail.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
             Status|NEW                         |RESOLVED
                 CC|                            |dblaikie at gmail.com
         Resolution|---                         |INVALID

--- Comment #1 from David Blaikie <dblaikie at gmail.com> ---
Looks like undefined behavior to me.

signed integer overflow (as happens at the beginning of the call to checked_add
when passed max_int) is undefined. Since your program unconditionally executes
that addition, the behavior of the entire program is undefined - nothing it
does, even before the point of the addition, is guaranteed by the C++ standard.

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