[llvm-bugs] [Bug 33578] Optimization introduces error when right shifting by integer width.
via llvm-bugs
llvm-bugs at lists.llvm.org
Fri Jun 23 16:06:08 PDT 2017
https://bugs.llvm.org/show_bug.cgi?id=33578
Davide Italiano <davide at freebsd.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
CC| |davide at freebsd.org
Resolution|--- |INVALID
--- Comment #1 from Davide Italiano <davide at freebsd.org> ---
I think this is UB.
Clang warns you if you fold a constant in the source.
ub.cpp:5:27: warning: shift count >= width of type [-Wshift-count-overflow]
return ((x << 0) | (x >> (64 - 0)));
^ ~~~~~~~~
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