[LLVMbugs] [Bug 16744] Clang optimized out a branch function with Os option

bugzilla-daemon at llvm.org bugzilla-daemon at llvm.org
Mon Jul 29 18:52:49 PDT 2013


Eli Friedman <sharparrow1 at yahoo.com> changed:

           What    |Removed                     |Added
             Status|NEW                         |RESOLVED
                 CC|                            |sharparrow1 at yahoo.com
         Resolution|---                         |INVALID

--- Comment #1 from Eli Friedman <sharparrow1 at yahoo.com> ---
clang is behaving correctly here.  Assuming no undefined behavior,
pxMutex->uxRecursiveCallCount must point at the same object before and after
the decrement, so it can't be null.  Therefore, xQueueGenericSend can never be

If you want clang to not optimize this sort of construct, you can pass -fwrapv.

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