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Which of the following is not a bit test instruction?

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+1 vote
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in Microprocessor by (39.4k points)
Which of the following is not a bit test instruction?

(a) BTC

(b) BTS

(c) BSF

(d) BTR

I got this question during an interview for a job.

My question comes from Enhanced Instruction Set of 80386 in portion 32-bit Processors-80386, 80387 and 80486 of Microprocessor

1 Answer

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by (49.2k points)
Right choice is (c) BSF

Easiest explanation: The instruction, BSF, is a bit scan instruction. The four bit test instructions are:

BT (Test a Bit), BTC (Test a Bit and Complement), BTR (Test and Reset a Bit) and BTS (Test and Set a bit).

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