Gate2017 cs Q38

0. Consider a RISC machine where each instruction is exactly 4 bytes long. Conditional and unconditional branch instructions use PC- relative addressing mode with Offset specified in bytes to the target location of the branch instruction. Further the Offset is always with respect to the address of the next instruction in the program sequence. Consider the following instruction sequence.
Inst. No. Instruction
i: add R2, R3, R4
i + 1: sub R5, R6, R7
i + 2: cmp R1, R9, R10
i + 3 beq R1, offset

If the target of the branch instruction is i, then the decimal value of the Offset is _____.

Note – Numerical Type question

Answer
Comment
Array

Option : B
Explanation :
I₁ 0-3
₂ 4-7
I₃ 8-11
I₄ 12-15
16-
I₄ is the branch instruction & is the target.
0 = 16+ relative value
∴ relative value = -16

Forgot your password?

I agree with the Terms.