Knowee
Questions
Features
Study Tools

The variables f and g are assigned to the registers X3 and X4, respectively in these ARM instructions. Loop: SUBS XZR, X3, X4         B.GE Exit                 LSL X3, X3, 1         B LoopExit: What are the corresponding statements in the C language?

Question

The variables f and g are assigned to the registers X3 and X4, respectively in these ARM instructions. Loop: SUBS XZR, X3, X4         B.GE Exit                 LSL X3, X3, 1         B LoopExit: What are the corresponding statements in the C language?

🧐 Not the exact question you are looking for?Go ask a question

Solution

The ARM assembly code provided can be translated into the following C code:

while (f >= g) {
    f = f << 1;
}

Here's the step-by-step translation:

  1. Loop: This is a label in ARM assembly that marks the start of the loop. In C, this is represented by the while keyword.

  2. SUBS XZR, X3, X4 This instruction subtracts the value in X4 (g) from the value in X3 (f) and sets the condition flags based on the result. This is equivalent to the condition in a while loop in C, f >= g.

  3. B.GE Exit This instruction branches to the label Exit if the result of the previous SUBS instruction was greater than or equal to zero. In C, this is represented by the end of the while loop when the condition f >= g is no longer true.

  4. LSL X3, X3, 1 This instruction performs a logical shift left on the value in X3 (f), effectively multiplying it by 2. In C, this is represented by the statement f = f << 1.

  5. B Loop This instruction branches back to the Loop label, repeating the loop. In C, this is represented by the end of the while loop block.

  6. Exit: This is a label in ARM assembly that marks the end of the loop. In C, this is represented by the end of the while loop.

This problem has been solved

Similar Questions

Registers X1, X2, X3 have corresponding data stored in each location: X1: AX2: BX3: C Which set of ARM instructions will accomplish A=B+C?

Which of these loop statements exist in C?

22Given this set of ARM instructions, where b is at offset 0, e is at offset 8, and a is at offset 24: LDUR   X1, [X0,#0]LDUR   X2, [X0,#8]ADD    X3,  X1, X2STUR   X3, [X0,#24] What is the corresponding C language statement? a = b + e; a = e + a; a = a + e; a = b + a;

For the following C statement, what is the correspondingMIPS assembly code? Assume that the variables f, g, h, i, and j are assigned toregisters $s0, $s1, $s2, $s3, and $s4, respectively. Assume that the base addressof the arrays A and B are in registers $s6 and $s7, respectively.B[8] = A[i−j];2.4 [5] <§§2.2, 2.3> For the MIPS assembly instructions below, what is thecorresponding C statement? Assume that the variables f, g, h, i, and j are assignedto registers $s0, $s1, $s2, $s3, and $s4, respectively. Assume that the base addressof the arrays A and B are in registers $s6 and $s7, respectively.sll $t0, $s0, 2 # $t0 = f * 4add $t0, $s6, $t0 # $t0 = &A[f]sll $t1, $s1, 2 # $t1 = g * 4add $t1, $s7, $t1 # $t1 = &B[g]lw $s0, 0($t0) # f = A[f]addi $t2, $t0, 4lw $t0, 0($t2)add $t0, $t0, $s0sw $t0, 0($t1)2.5 [5] <§§2.2, 2.3> For the MIPS assembly instructions in Exercise 2.4, rewritethe assembly code to minimize the number if MIPS instructions (if possible)needed to carry out the same function.2.6 The table below shows 32-bit values of an array stored in memory.Address Data24 238 432 336 640 1

MOV BX, 05HMOV CX, 08HLOOP1: ADD BX, CXLOOP2: DEC CXJNZ LOOP2DEC BXJNZ LOOP1How many times will the outer loop, LOOP1 be executed in the given 806 assembly code, and what is the final value in BX after the execution of the provided assembly code?

1/3

Upgrade your grade with Knowee

Get personalized homework help. Review tough concepts in more detail, or go deeper into your topic by exploring other relevant questions.