CMPSB - 8086

Compare bytes: ES:[DI] from DS:[SI].
Algorithm :
DS:[SI]-ES:[DI]
Sets flag according to Result : OF,ZF,AF,CF,SF,PF
if DF = 1 : SI=SI+1 and DI=DI+1
else : SI=SI-1 and DI=DI-1

Syntax

cmpsb

Example

.model small
.data
  s1 db 'hello World'
  s2 db 'hello World'
  ...
  ...
.code
  ...
  ...
  lea si,s1
  lea di,s2
  repne cmpsb
  ...
  ...
  end

Output / Return Value

Limitations

Alternatives / See Also

Reference