WS
if ((uintptr_t)s % WS == (uintptr_t)d % WS) {
while ((uintptr_t)d % WS) {
for (; n>=WS; n-=WS, d+=WS, s+=WS) *(WT *)d = *(WT *)s;
if ((uintptr_t)s % WS == (uintptr_t)d % WS) {
while ((uintptr_t)(d+n) % WS) {
while (n>=WS) n-=WS, *(WT *)(d+n) = *(WT *)(s+n);