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Chapter 2: Q42E (page 173)

Question: If the current value of the PC is 0x1FFFf000, can you use a single jump instruction to get to the PC address as shown in Exercise 2.39?

Short Answer

Expert verified

Yes, since the range is

Step by step solution

01

Determine the MIPS jump instruction


The MIPS assembly language has the j instruction to perform the jump. The address of the target will be reached through jump only if the target address lies within the jump range. The range of the address can be calculated by adding the word length and the program counter value with the starting range.

For example:

j 3500

02

Determine whether the single jump instruction will be enough to get to the PC address.

The given value of PC is 0x1FFFf000.

For the jump instruction the address range can be calculated as follows:

Let us consider the register values from the exercise 2.39 as given in the question.

Range:


The value of PC is added with the base register value and the value of register from exercise 2.39 is added.

The above is the range of the jump instruction.

So, Yes single jump instruction can be used, because the range of the jump is


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Most popular questions from this chapter

Question: For each function call, show the contents of the stack after the function call is made. Assume the stack pointer is originally at address 0x7ff ff ff c, and follow the register conventions as specified in Figure 2.11.

Question: Provide the type and hexadecimal representation of the following instruction:

sw \(t1, 32(\)t2)

Question:2.28 [5] How many MIPS instructions does it take to implement the C code from Exercise 2.27? If the variables a and b are initialized to 10 and 1 and all elements of D are initially 0, what is the total number of MIPS instructions that is executed to complete the loop?

The table below shows 32-bit values of an array stored in memory.

2.6.1 For the memory locations in the table above, write C code to sort the data from lowest to highest, placing the lowest value in the smallest memory location shown in the figure. Assume that the data shown represents the C variable called Array, which is an array of type int, and that the first number in the array shown is the first element in the array. Assume that this particular machine is a byte-addressable machine and a word consists of four bytes.

2.6.2 For the memory locations in the table above, write MIPS code to sort the data from lowest to highest, placing the lowest value in the smallest memory location. Use a minimum number of MIPS instructions. Assume the base address of Array is stored in register $s6.

Assume that \(s0 holds the value 128ten.

  1. For the instruction add \)t0, \(s0, \)s1, what is the range(s) of values for \(s1 that would result in overflow?
  2. For the instruction sub \)t0, \(s0, \)s1, what is the range(s) of values for \(s1 that would result in overflow?
  3. For the instruction sub \)t0, \(s1, \)s0, what is the range(s) of values for $s1 that would result in overflow?
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