Homework Answers
Answer:-
If register between Instruction Decode (ID) and Execute Stage (EX) will remove then
(A) Stall or Gap will be created due to register dependency and 3 Cycle pipeline bubble will be created
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In the above figure you can see that if register is removed then a 3 cycle stall will be required and 3 Cycle pipeline bubble can be seen. Therefore number of clock cycle increases.
(B). If we asume ideal CPI for both the cases then the speed of new four stage pipeline will increase because this time there is no need of fetching the instruction while in five stage pipeline it has to fetch the instruction so it will take more time.
(C). In case to change the design of pipeline from five to four stage we have to reduce the number of NOP by one (1) i.e. in four stage pipeline the required NOP will be 2.
Add Answer to:
1. Consider the MIPS pipeline discussed in class, suppose the register between the Instruction Decode and...
The latencies of individual stages in five-stage MIPS (Microprocessor without Interlocked Pipeline Stages) Architecture are given...
The latencies of individual stages in five-stage MIPS (Microprocessor without Interlocked Pipeline Stages) Architecture are given below. Instruction Instruction Fetch Register Read Arithmetic Logic Unit (ALU) Memory Access Register Write Latency 200ps 100ps 200ps 300ps 100ps a. (10 pts) What is the clock cycle time in a pipelined and non-pipelined processor? Pipelined version : ______________ Non-pipelined version : ______________ b. The classic five-stage pipeline MIPS architecture is used to execute the code fragments. Assume the followings: Register write is done...
Consider a standard 5-stage MIPS pipeline of the type discussed during the class sessions: IF- ID-EX-M-WB....
Consider a standard 5-stage MIPS pipeline of the type discussed
during the class sessions: IF-
ID-EX-M-WB.
Assume that forwarding is not implemented and only the hazard
detection and stall logic is
implemented so that all data dependencies are handled by having the
pipeline stall until the
register fetch will result in the correct data being fetched.
Furthermore, assume that the memory is written/updated in the first
half of the clock cycle
(i.e. on the rising edge of the clock) and...
Suppose the times required by each of the functional units of a MIPS processor to do...
Suppose the times required by each of the functional units of a MIPS processor to do their work are: Instruction Memory: 400 ps Data Memory: 400 ps ALU: 300 ps Register file: 200 ps lgnoring the overhead introduced by the pipeline registers, what is the maximum speedup achieved by the pipelined processor with fetch, decode, execute, memory and write back stages vis-a-vis the single-cycle processor? Give your answer to two decimal places.
A non-pipelined processor has a clock rate of 1 GHz and an average instruction takes 9...
A non-pipelined processor has a clock rate of 1 GHz and an average instruction takes 9 cycles to execute. The manufacturer has decided to design a pipelined version of this processor. For this purpose, the instruction cycle has been divided into five stages with the following latencies: Stage 1 – 2.0 ns,Stage 2 – 1.5 ns, Stage 3 – 1.0 ns, Stage 4 – 2.6 ns, Stage 5 – 1.9 ns. Each stage will require an extra 0.4 ns for...
The classic five-stage pipeline MIPS architecture is used to execute the code fragments in this problem....
The classic five-stage pipeline MIPS architecture is used to
execute the code fragments in this problem. Assume the
followings:
The architecture fully supports forwarding,
Register write is done in the first half of the clock cycle;
register read is performed in the second half of the clock
cycle,
Branches are resolved in the third stage of the pipeline and
the architecture does not utilize any branch prediction
mechanism,
Register R4 is initially 100.
L1: lw R1,
0(R4)
add R3, R1, R2
sw ...
A 5-Stage pipeline is composed of the following stages Instruction Fetch (IF), Decode (DE), Execute (EX), Memory Access...
A 5-Stage pipeline is composed
of the following stages Instruction Fetch (IF), Decode (DE),
Execute (EX), Memory Access (ME) and Register Write-back (WB).
Assume the pipeline does not have a branch prediction unit, does
not have superscalar support and does not support out of order
execution. Assume that all memory accesses are in the L1 cache and
therefore do not introduce any stalls. Show a pipeline diagram that
shows the execution of each stage for the assembly code below. Also...
The classic five-stage pipeline MIPS architecture is used to execute the code fragments. Assume the followings:...
The classic five-stage pipeline MIPS architecture is used to execute the code fragments. Assume the followings: Register write is done in the first half of the clock cycle; register read is performed in the second half of the clock cycle, Branches are resolved in the SECOND stage of the pipeline and the architecture does not utilize any branch prediction mechanism Forwarding is FULLY supported. Assuming there is no dependence other than one(s) given in the code, show the pipeline diagram....
1. Given the following instruction sequence for the MIPS processor with the standard 5 stage pipeline $10, S0. 4 addi lw S2.0(S10) add sw S2,4(510) $2, $2, $2 Show the data dependences between th...
1. Given the following instruction sequence for the MIPS processor with the standard 5 stage pipeline $10, S0. 4 addi lw S2.0(S10) add sw S2,4(510) $2, $2, $2 Show the data dependences between the instructions above by drawing arrows between dependent instructions (only show true/data dependencies). a. Assuming forwarding support, in what cycle would the store instruction write back to memory? Show the cycle by cycle execution of the instructions as they execute in the pipeline. Also, show any stalls...
The classic five-stage pipeline MIPS architecture is used to execute the code fragments in this problem....
The classic five-stage pipeline MIPS architecture is used to execute the code fragments in this problem. Assume the followings: • The architecture fully supports forwarding, • Register write is done in the first half of the clock cycle; register read is performed in the second half of the clock cycle, • Branches are resolved in the third stage of the pipeline and the architecture does not utilize any branch prediction mechanism, • Register R4 is initially 100. L1: lw add...
Assume the MIPS instruction subset is redefinied to contain only the following instructions: 1. Assume that...
Assume the MIPS instruction subset is redefinied to contain
only the following instructions:
1. Assume that our MIPS instruction subset is redefined to contain only the following instructions: Instruction Instruction fetch Register read & ALU operation Data Memory Register write decode 0 ns R-format 2ns 1 ns lw ns l ns 2 ns 5 ns 1 ns ns 1 ns ns 0 0 bne The table lists the times required for each step within each instruction. Recall that with the...
Consider a standard 5-stage MIPS pipeline of the type discussed
during the class sessions: IF-
ID-EX-M-WB.
Assume that forwarding is not implemented and only the hazard
detection and stall logic is
implemented so that all data dependencies are handled by having the
pipeline stall until the
register fetch will result in the correct data being fetched.
Furthermore, assume that the memory is written/updated in the first
half of the clock cycle
(i.e. on the rising edge of the clock) and...
Suppose the times required by each of the functional units of a MIPS processor to do their work are: Instruction Memory: 400 ps Data Memory: 400 ps ALU: 300 ps Register file: 200 ps lgnoring the overhead introduced by the pipeline registers, what is the maximum speedup achieved by the pipelined processor with fetch, decode, execute, memory and write back stages vis-a-vis the single-cycle processor? Give your answer to two decimal places.
The classic five-stage pipeline MIPS architecture is used to
execute the code fragments in this problem. Assume the
followings:
The architecture fully supports forwarding,
Register write is done in the first half of the clock cycle;
register read is performed in the second half of the clock
cycle,
Branches are resolved in the third stage of the pipeline and
the architecture does not utilize any branch prediction
mechanism,
Register R4 is initially 100.
L1: lw R1,
0(R4)
add R3, R1, R2
sw ...
A 5-Stage pipeline is composed
of the following stages Instruction Fetch (IF), Decode (DE),
Execute (EX), Memory Access (ME) and Register Write-back (WB).
Assume the pipeline does not have a branch prediction unit, does
not have superscalar support and does not support out of order
execution. Assume that all memory accesses are in the L1 cache and
therefore do not introduce any stalls. Show a pipeline diagram that
shows the execution of each stage for the assembly code below. Also...
1. Given the following instruction sequence for the MIPS processor with the standard 5 stage pipeline $10, S0. 4 addi lw S2.0(S10) add sw S2,4(510) $2, $2, $2 Show the data dependences between the instructions above by drawing arrows between dependent instructions (only show true/data dependencies). a. Assuming forwarding support, in what cycle would the store instruction write back to memory? Show the cycle by cycle execution of the instructions as they execute in the pipeline. Also, show any stalls...
The classic five-stage pipeline MIPS architecture is used to execute the code fragments in this problem. Assume the followings: • The architecture fully supports forwarding, • Register write is done in the first half of the clock cycle; register read is performed in the second half of the clock cycle, • Branches are resolved in the third stage of the pipeline and the architecture does not utilize any branch prediction mechanism, • Register R4 is initially 100. L1: lw add...
Assume the MIPS instruction subset is redefinied to contain
only the following instructions:
1. Assume that our MIPS instruction subset is redefined to contain only the following instructions: Instruction Instruction fetch Register read & ALU operation Data Memory Register write decode 0 ns R-format 2ns 1 ns lw ns l ns 2 ns 5 ns 1 ns ns 1 ns ns 0 0 bne The table lists the times required for each step within each instruction. Recall that with the...
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