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辅助寄存器arx指针跳转问题

Other Parts Discussed in Thread: TMS320C5505

有一段TMS320C5505的汇编代码:

mpym *ar4+, ac0, ac1 ; 
macm *ar4+, *(ar3+1), 
macm *ar4+, *ar3, ac1 ; 

ar3的初始值为0,执行完macm *ar4+, *(ar3+1)后,ar3应该是0还是1?

个人觉得ar3应该还是0,但调试时发现ar3的值变为1了?

为什么?