单选题在无转发机制的五段基本流水线(取指、译码/读寄存器、运算、访存、写回寄存器)中,下列指令序列存在数据冒险的指令对是( )。I1:add R1,R2,R3;(R2)+(R3)→R1I2:add R5,R2,R4;(R2)+(R4)→R5I3:add R4,R5,R3;(R5)+(R3)→R4I4:add R5,R2,R6;(R2)+(R6)→R5AI1和I2BI2和I3CI2和I4DI3和I4
单选题
在无转发机制的五段基本流水线(取指、译码/读寄存器、运算、访存、写回寄存器)中,下列指令序列存在数据冒险的指令对是( )。I1:add R1,R2,R3;(R2)+(R3)→R1I2:add R5,R2,R4;(R2)+(R4)→R5I3:add R4,R5,R3;(R5)+(R3)→R4I4:add R5,R2,R6;(R2)+(R6)→R5
A
I1和I2
B
I2和I3
C
I2和I4
D
I3和I4
参考解析
解析:
当第二条指令中R5还未完成写入操作时,而第三条指令就对R5进行了读操作,如此会发生数据冒险。
当第二条指令中R5还未完成写入操作时,而第三条指令就对R5进行了读操作,如此会发生数据冒险。
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