LOAD_BIG_64
w0 = LOAD_BIG_64(blk + 8 * 0);
w1 = LOAD_BIG_64(blk + 8 * 1);
w2 = LOAD_BIG_64(blk + 8 * 2);
w3 = LOAD_BIG_64(blk + 8 * 3);
w4 = LOAD_BIG_64(blk + 8 * 4);
w5 = LOAD_BIG_64(blk + 8 * 5);
w6 = LOAD_BIG_64(blk + 8 * 6);
w7 = LOAD_BIG_64(blk + 8 * 7);
w8 = LOAD_BIG_64(blk + 8 * 8);
w9 = LOAD_BIG_64(blk + 8 * 9);
w10 = LOAD_BIG_64(blk + 8 * 10);
w11 = LOAD_BIG_64(blk + 8 * 11);
w12 = LOAD_BIG_64(blk + 8 * 12);
w13 = LOAD_BIG_64(blk + 8 * 13);
w14 = LOAD_BIG_64(blk + 8 * 14);
w15 = LOAD_BIG_64(blk + 8 * 15);