Texas Instruments TMS320C28x Reference Manual page 505

SUBCUL ACC,loc32
Example 1
; Calculate unsigned: Quot32 = Num32/Den32, Rem32 = Num32%Den32
MOVB
MOVL
RPT
||SUBCUL
MOVL
MOVL
Example 2
; Calculate signed: Quot32 = Num32/Den32, Rem32 = Num32%Den32
CLRC
MOVL
ABSTC
MOVL
MOVL
ABSTC
MOVL
MOVB
RPT
||SUBCUL
MOVL
MOVL
NEGTC
MOVL
Example 3
; Calculate unsigned: Quot64 = Num64Den32, Rem32 = Num64%Den32
MOVB
MOVL
RPT
||SUBCUL
MOVL
MOVL
RPT
||SUBCUL
MOVL
MOVL
6-348
ACC,#0 ; Zero ACC
P,@Num32 ; Load P register with Num32
#31 ; Repeat operation 32 times
ACC,@Den32 ; Conditional subtract with Den32
@Rem32,ACC ; Store remainder in Rem32
@Quot32,P ; Store quotient in Quot32
TC ; Clear TC flag, used as sign flag
ACC,@Den32 ; Load ACC with contents of Den32
ACC ; Take absolute value, TC = sign ^ TC
XT,@ACC ; Temp save denominator in XT register
ACC,@Num32 ; Load ACC register with Num32
ACC ; Take abs value, TC = sign ^ TC
P,@ACC ; Load P register with numerator
ACC,#0 ; Zero ACC
#31 ; Repeat operation 32 times
ACC,@XT ; Conditional subtract with denominator
@Rem32,ACC ; Store remainder in Rem32
ACC,@P ; Load ACC with quotient
ACC ; Negate ACC if TC=1 (negative result)
@Quot32,ACC ; Store quotient in Quot32
ACC,#0 ; Zero ACC
P,@Num64+2 ; Load P with high 32-bits of Num64
#31 ; Repeat operation 32 times
ACC,@Den32 ; Conditional subtract with Den32
@Quot64+2,P ; Store high 32 bit quotient in Quot64
P,@Num64+0 ; Load P with low 32-bits of Num64
#31 ; Repeat operation 32 times
ACC,@Den32 ; Conditional subtract with Den32
@Rem32,ACC ; Store remainder in Rem32
@Quot64+0,P ; Store low 32 bit quotient in Quot64