block calc_c12(block A, block B, block C) {
block tempC = C.block12();
tempC.add_scratch();
future<block> A11B12 = async(rec_mult, A.block11(), B.block12(), C.block12());
future<block> A12B22 = async(rec_mult, A.block12(), B.block22(), tempC);
return add_blocks(A11B12.get(), A12B22.get(), C.block12());
}
block calc_c11(block A, block B, block C) {
block tempC = C.block11();//scratch space
tempC.add_scratch();
future<block> A11B11 = async(rec_mult, A.block11(), B.block11(), C.block11());
future<block> A12B21 = async(rec_mult, A.block12(), B.block21(), tempC);
return add_blocks(A11B11.get(), A12B21.get(), C.block11());
}