3-258 Vol. 2A DAA—Decimal Adjust AL after Addition
INSTRUCTION SET REFERENCE, A-M
Example
ADD AL, BL Before: AL=79H BL=35H EFLAGS(OSZAPC)=XXXXXX
After: AL=AEH BL=35H EFLAGS(0SZAPC)=110000
DAA Before: AL=AEH BL=35H EFLAGS(OSZAPC)=110000
After: AL=14H BL=35H EFLAGS(0SZAPC)=X00111
DAA Before: AL=2EH BL=35H EFLAGS(OSZAPC)=110000
After: AL=34H BL=35H EFLAGS(0SZAPC)=X00101
Flags Affected
The CF and AF flags are set if the adjustment of the value results in a decimal carry
in either digit of the result (see the “Operation” section above). The SF, ZF, and PF
flags are set according to the result. The OF flag is undefined.
Protected Mode Exceptions
#UD If the LOCK prefix is used.
Real-Address Mode Exceptions
#UD If the LOCK prefix is used.
Virtual-8086 Mode Exceptions
#UD If the LOCK prefix is used.
Compatibility Mode Exceptions
#UD If the LOCK prefix is used.
64-Bit Mode Exceptions
#UD If in 64-bit mode.
