[llvm-bugs] [Bug 37774] Incorrect result at self-comparison of uninitialized value
via llvm-bugs
llvm-bugs at lists.llvm.org
Tue Jun 12 15:35:55 PDT 2018
https://bugs.llvm.org/show_bug.cgi?id=37774
rtrieu at google.com changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |INVALID
CC| |rtrieu at google.com
Status|NEW |RESOLVED
--- Comment #1 from rtrieu at google.com ---
This is working as intended. A read from uninitialized memory has undefined
behavior. When a program runs into undefined behavior, anything can happen.
The optimizer detects that the condition is only evaluated after undefined
behavior has happened. Because of that, it removes the if-branch and executes
the else-branch unconditionally.
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