请问TMS320F2812汇编指令CMP64 ACC:P具体是什么意思有什么作用呢？

The 64-bit content of the combined ACC:P registers is compared against
zero and the flags are set appropriately:
if((V = 1) & (ACC(bit 31) = 1))
N = 0;
else
N = 1;
if((V = 1) & (ACC(bit 31) = 0))
N = 1;
else
N = 0;
if(ACC:P = 0x8000 0000 0000 0000)
Z = 1;
else
Z = 0;
V = 0;
Note: This operation should be used as follows:
CMP64 ACC:P ; Clear V flag
perform 64-bit operation
CMP64 ACC:P ; Set Z,N flags, V=0
conditionally branch