[llvm-bugs] [Bug 29118] LLVM O2: LLVM opt -O2 did wrong optimization happened on Power / x86.

[via llvm-bugs]

https://llvm.org/bugs/show_bug.cgi?id=29118

Sanjay Patel <spatel+llvm at rotateright.com> changed:

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

--- Comment #5 from Sanjay Patel <spatel+llvm at rotateright.com> ---
(In reply to comment #4)
> Well, we don't really have UB in the IR.
> But I think the IR semantics are that loading from an uninitialized alloca
> yields an undef value, with all of its consequences.

Sounds good to me. I checked that the memory sanitizer does report the reading
of uninitialized memory in the original program, so marking this as invalid.

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