SVE_Z_SHARED_BYTES
if (memcmp(in, out, SVE_Z_SHARED_BYTES) != 0) {
if (reg_size > SVE_Z_SHARED_BYTES &&
(memcmp(z_zero, out + SVE_Z_SHARED_BYTES,
reg_size - SVE_Z_SHARED_BYTES) != 0)) {