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TMS320F2812 汇编指令SUBCU 除法算法

初学DSP, 对于DSP汇编不是很熟悉  是不是DSP有其特定的汇编指令呢?比如2812的除法算法  代码如下:


CLRC TC ; Clear TC flag, used as sign flag
MOVB AH, #1 ;AH是ACC的高16位
MOVB AL, #0 ; 置ACC为65536
SUB ACC,#24576 ;得ACC为40960;即为除数
MOVL XT,@ACC 
MOVL ACC,*XAR4  
ABSTC ACC  
MOVL P,@ACC 
MOVB ACC,#0  ; Zero ACC
RPT #31  
||SUBCUL ACC,@XT 
 
MOVL ACC,@P  
NEGTC ACC  


MOVL XAR4,#real_part
MOVL *XAR4,ACC  

求大神指教代码具体含义,尤其是||SUBCUL ACC,@XT 是什么呢?

有没有大神解释哈哈。。。。