tcg/aarch64/tcg-target.opc.h - third_party/qemu - Git at Google

 /* Target-specific opcodes for host vector expansion.  These will be
    emitted by tcg_expand_vec_op.  For those familiar with GCC internals,
    consider these to be UNSPEC with names.  */

 DEF(aa64_sshl_vec, 1, 2, 0, IMPLVEC)
	/* Target-specific opcodes for host vector expansion. These will be
	emitted by tcg_expand_vec_op. For those familiar with GCC internals,
	consider these to be UNSPEC with names. */

	DEF(aa64_sshl_vec, 1, 2, 0, IMPLVEC)