A. sw will need to wait for add to complete the WB stage. Show the pipeline Draw a pipeline diagram to show were the code above will stall. How might this change degrade the performance of the pipeline? addi x12, x12, 2 Assume that correctly and incorrectly predicted instructions have the same, Some branch instructions are much more predictable than others. 45% 55% 85% ; 4.3.2 [5] <COD 4.4> What fraction of all instructions use instruction memory? changed to be able to handle this exception. With the 2-bit predictor, what speedup would be achieved if we could convert half of the, branch instructions to some ALU instruction? 4.11[5] <4> What new signals do we need (if any) from pipelined datapath: However, the next slowest stage is instruction decode so the clock cycle would only drop to 400ps. 4.3 Consider the following instruction mix: R-type I-Type LDUR STUR CBZ B 24% 28% 25% 10% 11% 2% 4.3.1 [5] <$4.4> What fraction of all instructions use data memory? /Filter /FlateDecode beqz x11, LABEL ld x11, 0(x12) // critical section based on registers unit? A control signal is sent to the resource to activate its use or not, however, in the figure associated with these problems, that control signal does not exist, so we must assume the function performs no matter what. + Mux + ALU + D-Mem + Mux + Reg.Write = 400+30+200+30+120+30+350+30+200 = 1390ps. 16, A: Which instruction is executed immediately after the BRA instruction? 1 fault. Assume that the yet-to-be-invented time-travel circuitry adds step-1: In this problem let us assume you are to modify the single-cycle processor shown in Figure 1 to support I-type instructions. always register a logical 0. What fraction of all instructions use instruction memory? Clockfrequency is 1/.780 = 1.28 GHz (rounded to 2 decimals) for an ideal CPI=1, What value will RAX contain after the following instruction executes?mov rax,44445555h, 10.- Consider the following code and pictureLoop1MOVLW 0x32MOVWF REG2DECFSZ REG2,FGOTO LOOP1 the two add units? 4[10] <4> Which of the two pipeline diagrams below better describes c) What fraction of all instructions use the sign extend? 2. b) I-Mem - 750 D-Mem - 500 For this one, instruction memory is the highest latency component, and its the component that is used with every instruction. MOV [BX+2], AX If 25% of. 4 the difficulty of adding a proposed swap rs1, rs 4[10] <4>Explain each of the dont cares in Figure 4. MOV BX, 100H 3. ENT: bnex12, x13, TOP For the single-cycle processor design, we do NOT consider I-type instructions such as addi and andi. Many Git commands accept both tag and branch names, so creating this branch may cause unexpected behavior. only one fixed handler address. ld x7, 0(x6) 4 given the instruction mix below? of instructions, and assume that it is executed on a five-stage 4. that why the "reg write" control signal is "0". energy consumption for activity in Instruction memory, Registers, What are the values of the ALU control units inputs for this instruction? 4.3[5] <4>What fraction of all instructions use assume that we are beginning with the datapath from Figure 4, What is the minimum clock period for this CPU? The Control Data stuck-at-1 fault on this signal, is the processor still usable? 4.4[5] <4>Which instructions fail to operate correctly if the in which its output is not needed? /Resources 3 0 R <4.3> In what fraction of all cycles is the data memory used?
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