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Chapter 2: Q41E (page 172)

Question: If the current value of the PC is 0x00000600, can you use a single jump instruction to get to the PC address as shown in Exercise 2.39?

Short Answer

Expert verified

No, 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.

For example:

j 3500

The above instruction will jump to the target address.

02

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

The given value of PC is 0x00000600.

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, No single jump instruction can be used, because the range of the jump is

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Most popular questions from this chapter

Consider the following code:

lbu \(t0, 0(\)t1)

sw \(t0, 0(t2)

Assume that the register \)t1 contains the address 0×10000000and the register \(t2 contains the address 0×10000010. Note the MIPS architecture utilizes big-endian addressing. Assume that the data (in hexadecimal) at the address role="math" localid="1650309285539" 0×10000000is 0×11223344 . What value is stored at the address pointed to by register \)t2?

Question: Assume \(t0 holds the value 0x00101000. What is the value of \)t2 after the following instructions?

slt \(t2, \)0, \(t0

bne \)t2, \(0, ELSE

j DONE

ELSE: addi \)t2,$t2, 2

DONE:

Rewrite the loop from Exercise 2.29 to reduce the number of MIPS instructions executed

For the following C statement, what is the corresponding MIPS assembly code? Assume that the variables f, g, h, i, and j are assigned to registers \(s0, \)s1, \(s2, \)s3, and \(s4, respectively. Assume that the base address of the arrays A and B are in registers \)s6 and $s7, respectively.

B[8]=A[i-j]

Write a program in MIPS assembly language to convert an ASCII number string containing positive and negative integer decimal strings, to an integer. Your program should expect register \(a0 to hold the address of a null-terminated string containing some combination of the digits 0 through 9. Your program should compute the integer value equivalent to this string of digits, then place the number in register \)v0. If a non-digit character appears anywhere in the string, your program should stop with the value -1 in register \(v0. For example, if register \)a0 points to a sequence of three bytes 50ten, 52ten, 0ten (the null-terminating string “24”), then when the program stops, register $v0 should contain the value 24ten.
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