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If a ‘1’ is encountered when an operand is scanned by BSF, then

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in Microprocessor by (39.4k points)
If a ‘1’ is encountered when an operand is scanned by BSF, then

(a) zero flag is reset

(b) zero flag is set

(c) VM flag is set

(d) RF flag is reset

The question was asked in an interview for internship.

My question is based upon Enhanced Instruction Set of 80386 in section 32-bit Processors-80386, 80387 and 80486 of Microprocessor

1 Answer

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by (49.2k points)
Correct answer is (b) zero flag is set

Easy explanation: The BSF instruction scans the operand from right to left. If a ‘1’ is encountered during the scan, zero flag is set, and the bit position of ‘1’ is stored into the destination operand.

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