## ALP Programming Guide and Reference

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### Notes

When the destination is a 32-bit register, the 16-bit source operand is copied into the lower 16 bits of the destination register, and the upper 16 bits of the register are undefined. With a 16-bit register operand, only the lower 16 bits of the destination are affected (the upper 16 bits remain unchanged). With a memory operand, the source is written to memory as a 16- bit quantity, regardless of operand size. As a result, 32-bit software should always treat the destination as 16-bits and mask bits 16-31, if necessary.