[llvm-bugs] [Bug 35508] Labels generated, but no code above 'O0'

via llvm-bugs llvm-bugs at lists.llvm.org
Sun Dec 3 05:03:55 PST 2017


Dimitry Andric <dimitry at andric.com> changed:

           What    |Removed                     |Added
         Resolution|---                         |INVALID
                 CC|                            |dimitry at andric.com
             Status|NEW                         |RESOLVED

--- Comment #1 from Dimitry Andric <dimitry at andric.com> ---
Since you are assigning a null pointer to b, the operation "int c = *b" is
undefined, and basically everything after that is undefined.  So clang decides
to optimize the whole loop away.

If you really want to dereference the null pointer anyway (which will crash at
runtime), try using "volatile int *" instead.

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