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CCS仿真c6k指令CROT90的问题



请教一个问题,在CCS5.5里软件仿真以下代码:

MVKL    .S2        0x7fff8000, B17    ;B17 = src1
MVKH    .S2        0x7fff8000, B17    ;B17 = src1
MVKL    .S2        0x7fff7fff, B23    ;B23 = result
MVKH    .S2        0x7fff7fff, B23    ;B23 = result
CROT90    .L2        B17,B21

执行完CROT90,赋给B21的值应该是7fff7fff,CCS计算出的值是80007fff?请教这是什么问题?