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What is the meaning of '@' in the comments

Hi,

The following is except from Page 74, spru198.pdf. I would like to know what is the meaning of @ in the comments. Thanks to the previous post replier who answers my questions. I want to write efficent C and assembly code in DSP. Thanks in advance.

 

 

 ............

[ B0] SUB .S2 B0,1,B0 ;

|| [!B0] ADD .L2 B2,B7:B6,B7:B6 ; |21|

|| [!B0] ADD .L1 A0,A5:A4,A5:A4 ; |21|

|| MPYHL .M2 B1,B3,B3 ; @|21|

|| [ A1] SUB .S1 A1,1,A1 ; @@|21|

|| LDW .D2T2 *++B8(8),B1 ; @@@|21|

|| LDH .D1T1 *++A8(8),A0 ; @@@|21|