top->eval();
// if (top->clk == 1)
// printf("%d: Bubble: %d. PC: %08x. Ins'n: %08x\n", main_time/2, top->bubbleshield, top->pc, top->insn);
top->eval();
// if (top->clk == 1)
// printf("%d: Bubble: %d. PC: %08x. Ins'n: %08x\n", main_time/2, top->bubbleshield, top->pc, top->insn);