Motorola DSP96002 User Manual page 578

divloop_fast not
lsl
lsr
tst
neg
divdone
The final quotient is destroyed in the generation of the remainder. This program calculates only the number
of quotient bits required and has variable execution time.
Signed 32 Bit Integer
Remainder of d0 = d0 rem d1, d0 >= d1
abs
abs
cmp
jlo
bfind
bfind
move
sub
inc
lsl
do
cmp
sub
rol
remloop_fastlsr
tst
neg
divdone
B.1.33 Graphics Accept/Reject Of Polygons
In graphics applications, checks are made to determine if objects are within a viewing window. Initial
checks are made to see if the object can be trivially accepted or trivially rejected. If the object can not be
trivially accepted/rejected, then a clipping algorithm is used.
The following code segments perform the trivial accept/reject of a point, line or 4 point polygon within a
cube.
B.1.33.1 One Point Accept/Reject
This determines if the point (x,y,z) is within a three-dimensional view cube. If the point is within the cube,
the A (accept) bit of the CCR will be set. Single point accept/reject for plotting is useful for plotting of sto-
chastic images such as fractals.
MOTOROLA
d0 d8.l,d3.l
d2,d0
d2,d0 d1.m,d2.l
d2
d0 ifmi
d1 d0.l,d2.l
d2 d0.l,d1.m
d1,d2 d2.l,d2.m
divdone
d2,d0
d1,d2 d0.h,d0.l
d2.h,d2.l
d0,d2 d2.m,d0.l
d2 d2.l,d2.h
d2,d1 d2.l,d2.h
d2.l,remloop_fast
d1,d0
d1,d0 ifhs
d0
d2,d0 d1.m,d2.l
d2
d0 ifmi
DSP96002 USER'S MANUAL B-59