https://llvm.org/bugs/show_bug.cgi?id=28833
David Majnemer <david.majne...@gmail.com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |david.majne...@gmail.com
Resolution|--- |INVALID
--- Comment #1 from David Majnemer <david.majne...@gmail.com> ---
It is not correct to transform ((unsigned)__builtin_strlen(s)) == 0 into *s ==
0.
The unsigned cast is masking out the high half of the strlen result.
For example, if __builtin_strlen comes out to 1ULL << 32 then
(unsigned)__builtin_strlen is zero but *s isn't 0.
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