In the LEGv8 5-stage pipeline, if an exception occurs, it is handled in the next clock cycle. Group of answer choices True False
Added by Francisco Jose M.
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The stages typically include Instruction Fetch (IF), Instruction Decode (ID), Execute (EX), Memory Access (MEM), and Write Back (WB). Show more…
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Akash M.
Consider the following sequence of instructions: ADD $R_{1}, R_{2} \quad R_{1} \leftarrow R_{1}+R_{2}$ $\begin{array}{ll}\text { BEZ Target } & \text { Branch if Zero }\end{array}$ MUL $R_{3}, R_{4} \quad R_{3} \leftarrow R_{3} * R_{4}$ MOVE $R_{1}, 10 \quad R_{1} \leftarrow 10$ Target: Assume that this program executed on a 6-stage pipelined processor and each stage required 1 clock cycle. Let us suppose that "branch not taken" Prediction is used but the prediction is not fulfilled, then the penalty will be (branch outcome is known at $5^{\text {th }}$ stage) (A) 1 clock cycle (B) 2 clock cycles (C) 3 clock cycles (D) 4 clock cycles
Computer Organization and Architecture
Instruction Pipelining
Question 1: Consider an LEGv8 processor with a pipelined implementation consisting of five stages: 1. IF: Instruction Fetch 2. ID: Instruction Decode 3. EXE: Execution 4. MEM: Memory Access 5. WB: Write Back Write operations occur in the first half of the clock cycle, and reads occur in the second half of the clock cycle. The table below shows the pipelining diagram for three instructions: Inst/CC 1 2 3 4 5 6 7 8 Inst. 1 IF ID EXE MEM WB Stall Inst. 2 IF ID EXE MEM WB Inst. 3 IF ID EXE MEM WB Where CC stands for clock cycle, stalls are shown as empty rows, and forwarding is indicated between associated stages using an arrow. LDUR X0,[X0, #0] ADD X1,X0,X0 SUB X2,X1,X2 ADD X3,X2,X3 SUB X4,X1,X3 a. First, assume forwarding is not available. Show a similar table for the above sequence of instructions and indicate stalls with empty rows. How many cycles are needed to execute the above sequence of instructions? b. This time, assume that forwarding is available. Show a similar table for the above sequence of instructions and indicate stalls with empty rows and forwarding with arrows. How many cycles are needed to execute the above sequence of instructions?
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