blk0
#define R0(v,w,x,y,z,i) z+=((w&(x^y))^y)+blk0(i)+0x5A827999+rol(v,5);w=rol(w,30);
daddr_t blk, blk0;
blk0 = swp_pager_meta_lookup(blks, pindex);
if (blk0 == SWAPBLK_NONE) {
if (blk != blk0 - i)
if (blk != blk0 + i)