GATE | GATE-CS-2006 | Question 43

Consider a new instruction named branch-on-bit-set (mnemonic bbs). The instruction “bbs reg, pos, label” jumps to label if bit in position pos of register operand reg is one. A register is 32 bits wide and the bits are numbered 0 to 31, bit in position 0 being the least significant. Consider the following emulation of this instruction on a processor that does not have bbs implemented. temp¬reg & mask Branch to label if temp is non-zero. The variable temp is a temporary register. For correct emulation, the variable mask must be generated by:
(A) mask ← 0 x 1 ο pos
(B) mask ← 0 x ffffffff ο pos
(C) mask ← pos
(D) mask ← 0 × f

Answer: (A)


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