g1_fun
t1 = g1_fun(blk[1]); t0 = g0_fun(blk[0]); \
t1 = g1_fun(blk[3]); t0 = g0_fun(blk[2]); \
t1 = g1_fun(blk[1]); t0 = g0_fun(blk[0]); \
t1 = g1_fun(blk[3]); t0 = g0_fun(blk[2]); \