Pros and cons of general purpose register architecture, Computer Engineering

Assignment Help:

Q. Pros and Cons of general purpose register architecture?

General Purpose Register Architecture: Pros and Cons

  • Registers can be employed to store variables as it decreases memory traffic and boosts up execution. It also increases code density as register names are shorter than memory addresses.
  • Instructions shouldcomprise bits to specify which register to operate on henceforth large instruction size than accumulator type machines.
  • Memory access can be minimized (registers can hold many intermediate values).
  • Implementation is complex as compiler writer has to try to maximize register usage.

While most early machines used accumulator architectures or stack in the last 15 years all CPUs made are GPR processors. The 3 main reasons are that registers are faster than memory; the more data that can be kept internally in CPU the faster the program will execute. The third reason is that registers are easier for a compiler to use.  

However while CPU's with GPR were clearly better than previous stack and accumulator based CPU's yet they were lacking in various areas. The areas being: Instructions were of varying length from 1 byte to 6-8 bytes. This causes problems with pre-fetching and pipelining of instructions. ALU instructions can have operands which were memory locations since the time to access memory is slower and so does the whole instruction.  

So in the early 1980s the concept of RISC was presented. RISC signifies Reduced Instruction Set Computer. Unlike CISC this ISA uses fewer instructions with simple constructs so they can be executed much faster within CPU without having to use memory as often. First RISC CPU, the MIPS 2000 has 32 GPRs. MIPS is a store/load architecture that means only load and store instructions access memory. All other computational instructions preform only on values stored in registers.


Related Discussions:- Pros and cons of general purpose register architecture

Implementation of 4-to-1 multiplexer, Implement the Y(A, B, C) = ∑(2,3,5,6)...

Implement the Y(A, B, C) = ∑(2,3,5,6) function using 4-to-1 multiplexer.   Ans. Y(A,B,C)=∑(2,3,5,6) Here we take B,C as the select bits also A as input. To select the input we can

Software engineering, What are coupling and cohesion and why are they impor...

What are coupling and cohesion and why are they important concepts in software design?

Balance - principles of composition, Balance The balance of an image ca...

Balance The balance of an image can be thought of as the distribution of visual weight within the piece. A piece of art can be structured so that the elements create a sense of

Explain function of dual slope analogue to digital converter, Draw and expl...

Draw and explain the function of dual slope analogue to digital converter. Derive the equations used. Ans.               Dual slope A/D converter : This has 4 main blocks.

Computer architecture by henessy and patterson, what is initial interval an...

what is initial interval and latency in a functional unit(fp) of a pipeline

Find the physical address of instruction, Q. Find the Physical address of i...

Q. Find the Physical address of instruction? Value of Instruction Pointer and holding address of instruction = 1234h Value of code segment register (CS) = 448Ah Physical

Flynns categorization, Normal 0 false false false EN-US...

Normal 0 false false false EN-US X-NONE X-NONE

Describe clusters in cellular systems, Question: a) With the help of a...

Question: a) With the help of a diagram, describe clusters in cellular systems. b) Describe the role of the following components in the GSM architecture Radio Sub-Sy

What are two reasons for using layered protocol, What are two reasons for u...

What are two reasons for using layered protocol? Layered protocol implies protocols used into each layer are the layer's own business that is they don't influence protocol of a

Write Your Message!

Captcha
Free Assignment Quote

Assured A++ Grade

Get guaranteed satisfaction & time on delivery in every assignment order you paid with us! We ensure premium quality solution document along with free turntin report!

All rights reserved! Copyrights ©2019-2020 ExpertsMind IT Educational Pvt Ltd