What has to happen in order for the one-operand IMUL to set the Carry and Overflow flags?

EBK JAVA PROGRAMMING
9th Edition
ISBN:9781337671385
Author:FARRELL
Publisher:FARRELL
Chapter6: Looping
Section: Chapter Questions
Problem 8RQ
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What has to happen in order for the one-operand IMUL to set the Carry and Overflow flags?

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It is already known that in IMUL flags the Carry and Overflow flags are set if the upper half of the commodity destination register does not consist of the extended sign of the lower half of it.

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