bs = bitset_alloca(n_regs);
alloc_nodes = alloca(n_regs * sizeof(alloc_nodes[0]));
//bp = hungarian_new(n_regs, n_regs, 2, HUNGARIAN_MATCH_PERFECT);
bs = bitset_alloca(n_regs);
alloc_nodes = alloca(n_regs * sizeof(alloc_nodes[0]));
//bp = hungarian_new(n_regs, n_regs, 2, HUNGARIAN_MATCH_PERFECT);