When you move a 16-bit constant or an 8-bit constant into a 64-bit register,the upper bits of the destination operand are cleared.

Name: When you move a 16-bit constant or an 8-bit constant into a 64-bit register,the upper bits of the destination operand are cleared.
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Quizplus · Accepted Answer

When a smaller constant value is moved into a larger register, the upper bits in the destination operand are automatically cleared, resulting in zero values. Therefore, the statement is true.

When You Move a 16-Bit Constant or an 8-Bit Constant