Texas Instruments TMS320C28x Reference Manual page 506

Example 4
; Calculate signed: Quot64 = Num364Den32, Rem32 = Num64%Den32
MOVL
MOVL
TBIT
SBF
NEG64
$10:
MOVL
MOVL
MOVL
ABSTC
MOVL
MOVB
RPT
||SUBCUL
MOVL
MOVL
RPT
||SUBCUL
MOVL
MOVL
SBF
NEG64
$20:
MOVL
MOVL
ACC,@Num64+2 ; Load ACC:P with 64-bit numerator
P,@Num64+0
@AH,#15 ; TC = sign of numerator
$10,NTC ; Take absolute value of numerator
ACC:P
@XAR3,P ; Temp save numerator low in XAR3
P,@ACC ; Load P register with numerator high
ACC,@Den32 ; Load ACC with contents of Den32
ACC ; Take absolute value, TC = sign ^ TC
XT,@ACC ; Temp save denominator in XT register
ACC,#0 ; Zero ACC
#31 ; Repeat operation 32 times
ACC,@XT ; Conditional subtract with denominator
@XAR4,P ; Store high quotient in XAR4
P,@XAR3 ; Load P with low numerator
#31 ; Repeat operation 32 times
ACC,@XT ; Conditional subtract with denominator
@Rem32,ACC ; Store remainder in Rem32
ACC,@XAR4 ; Load ACC with high quotient from XAR4
$20,NTC ; Take absolute value of quotient
ACC:P
@Quot64+0,P ; Store low quotient into Quot64
@Quot64+2,ACC ; Store high quotient into Quot64
SUBCUL ACC,loc32
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