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def branch_unit(cur_pc,imm,jalr_sel,branch_taken,alu_result): #输入值为当前pc（int），立即数，jalr信号，是否跳转信号，alu运算结果(全是int型)
pc_plus_4=cur_pc+4 #输出为pc_plus_imm,pc_plus_4,branch_target,pc_sel(忘了这是啥了，需要回头再看)
pc_plus_imm=cur_pc+imm
pc_sel = jalr_sel | (branch_taken & (alu_result%2))
if jalr_sel==1:
branch_target=alu_result&(2**32-2)
else:
branch_target=cur_pc+imm*2
return pc_plus_imm,pc_plus_4,branch_target,pc_sel
