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If a ‘1’ is not encountered when an operand is scanned by BSR, then

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+1 vote
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in Microprocessor by (39.4k points)
If a ‘1’ is not encountered when an operand is scanned by BSR, then

(a) zero flag is reset

(b) zero flag is set

(c) VM flag is reset

(d) RF flag is set

The question was asked during an interview.

Enquiry is 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 option is (a) zero flag is reset

To explain I would say: The BSR instruction scans the operand from left to right. If a ‘1’ is not encountered during the scan, zero flag is reset whether the scan is BSF or BSR.

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