[Bug middle-end/83623] [8 Regression] ICE: in convert_move, at expr.c:248 with -march=knl and 16bit vector bswap/rotate

[jakub at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=83623

--- Comment #3 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
Created attachment 42984
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=42984&action=edit
gcc8-pr83623.patch

Untested fix.