typedef unsigned long U64;

static void LZ4_copy8(void* dstPtr, const void* srcPtr)
{
   *(U64*)dstPtr = *(U64*)srcPtr;
}

void bar(void *d, void *s, void*e) {
  do { LZ4_copy8(d,s); d+=8; s+=8; } while (d<e);
}