Use of overlapped register windows, Computer Engineering

Assignment Help:

Q. Use of Overlapped Register Windows?

Register file comprises 138 registers. Let them be called by register number 0 - 137. 

Diagram demonstrates the use of registers: when there is call to function A(fA) that calls function B (fB) and function B calls function C (fC).

1726_Use of Overlapped Register Windows.png

Figure: Use of three Overlapped Register Windows

Please note the functioning of registers: at any instance of time global registers and only one window of registers is visible and is addressable as if it were only set of registers. So for programming purpose there can be only 32 registers. Window in the above illustration though has a total of 138 registers. This window comprises: 

  • Global registers that are shareable by all functions.
  • Parameters registers for holding parameters passed from previous function to current function. They also hold results which are to be passed back.
  • Local registers which hold the local variables as assigned by compiler.
  • Temporary registers: They are physically same as the parameter registers at subsequent level. This overlap allows parameter passing without actual movement of data.

 


Related Discussions:- Use of overlapped register windows

What is the necessity of interfacing in digital ic, What is the necessity o...

What is the necessity of Interfacing in digital ICs and what are the points to be kept in view, while interfacing between TTL gate and CMOS gate? Ans: To realize the optimum

What is null pointer, What is NULL POINTER Inside main, a FILE * called...

What is NULL POINTER Inside main, a FILE * called file. Afterwards, the fopen function, passing it the path to data file, as well as "r", only intending to read from the file.

What is difference between ram and fifo, What is difference between RAM and...

What is difference between RAM and FIFO? FIFO certainly does not have address lines. It is stands for first in and first out. It is an algorithm based method. It is used to s

What is the ccitt standard bandwidth for speech, The CCITT standard bandwid...

The CCITT standard bandwidth for speech is: (A) 20000 Hz                                  (B) 15000 Hz (C) 7000 Hz                                    (D) 3400 Hz Ans:

# real life business subsystem, Is production, marketing, personal, materia...

Is production, marketing, personal, material, finance are the real life business subsystems? if yes, then how?

Reading every record , You have a file having sporting goods that are sold ...

You have a file having sporting goods that are sold online. Every item record contains the item id, item name, item description, item category, item price, and the units in stock.

Determine the complete or gate and and gate decoder, Q. Determine the comp...

Q. Determine the complete OR gate and AND gate decoder count for an IC memory with 4096 words of 1 bit each, using the Linear select memory organization and Two dimensional Memory

Algorithem, for calculating simple interest

for calculating simple interest

Explain about the term false path, Explain about the term false path? How i...

Explain about the term false path? How it find out in circuit? What the effect of false path in circuit? By timing all the paths into the circuit the timing analyzer can find o

Features of mpi-1, Features of MPI-1 Binding for FORTRAN and C ...

Features of MPI-1 Binding for FORTRAN and C Collective communication Communication domains and Process groups Point-to-point communication Virtual process

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