srcx := (*uintptr)(unsafe.Pointer(src + i))
			p := buf.get2()
			p[0] = *dstx
			p[1] = *srcx
		}
	}
}

// countAlloc returns the number of objects allocated in span s by
// scanning the mark bitmap.
func (s *mspan) countAlloc() int {
	count := 0
	bytes := divRoundUp(uintptr(s.nelems), 8)
	// Iterate over each 8-byte chunk and count allocations