https://gcc.gnu.org/bugzilla/show_bug.cgi?id=120456

Alexander Monakov <amonakov at gcc dot gnu.org> changed:

           What    |Removed                     |Added
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                 CC|                            |amonakov at gcc dot gnu.org

--- Comment #1 from Alexander Monakov <amonakov at gcc dot gnu.org> ---
GCC would have to figure out that 128-bit halves of the first argument to
__builtin_shuffle are identical (256-bit pshufb works on 128-bit halves
separately, i.e. index 0 in the second half picks the 16'th byte of the input).

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