Tomasulo Algorithm Example 托马斯洛算法举例
必须保证具有依赖关系的指令之间有正确的指令顺序 必须可以区分下面这个指令顺序和example1。必须允许MD可以独立与LD执行 前两个要求是为了保证程序逻辑完整性,第三个要求是为了达到性能目标。下一章将会阐述完成这些目标的几个方法。 参考:An Efficient Algorithm for Exploiting Multiple Arithmetic Units ...
Algorithm Example of Tomasulo’s algorithm L.D F6, 34(R2) L.D F2, 45(R3) MUL.D F0, F2, F4 SUB.D F8, F6, F2 DIV.D F10, F0, F6 ADD.D F6, F8, F2 Instruction cycles Instructions Cycles Add 2 Sub 2 Multi 10 Div 40 Dynamic Scheduling: Examples and the Algorithm (...
hand BUT slow memory (no cache) Limitations of 6600 scoreboard No forwarding (First write register then read it) Limited to instructions in basic block (small window) Number of functional units(structural hazards) Wait for WAR and WAW hazards Advanced Computer Architecture 3 Tomasulo Algorithm vs....
Algorithm 1.Issue—getinstructionfromFPOpQueue Ifreservationstationfree(nostructuralhazard), controlissuesinstr&sendsoperands(renamesregisters). 2.Execution—operateonoperands(EX) Whenbothoperandsreadythenexecute; ifnotready,watchCommonDataBusforresult
Tomasulo算法详细过程演示
• Tomasulo Algorithm lets us schedule instructions dynamically (in hardware). • Branch prediction and speculative execution beyond a branch (of course with ability to flush wrong-path 7 ( y g p instructions on misprediction) will be covered later (and ...