Motorola DSP96002 User Manual page 572

6. Dynamic bit field insertion.
tains
move
d3,d4 #-1,d5.l
d4.l,d5.h
;shift one's mask up
one's mask down
and clear
1 1
Totals:
7. Static bit field clear.
move
#32-fsize,d1
;align field
mask and clear 1
Totals:
8. Static bit field set.
move
#32-fsize,d1
;align field
field
Totals:
MOTOROLA
FSIZE.
#32,d4.l
;32-fsize, load 1's mask 2
;32-(fsize+foff)
1
1 1
1 1 lsl
or d1,d0
9 9
#-1,d1.l
;make 1s size of foff 1
1
1
4 4
#-1,d1.l
;make 1s size of foff 1
1
1 1
4 4
DSP96002 USER'S MANUAL
Register d2.l contains FOFF, d3.l con-
;get 32
1 1 lsl
1 lsr d5,d5
andc d5,d0 d2.l,d1.h
d1,d1
;insert bit field
--- ---
;mask of all 1s
1
1 andc d1,d0
--- ---
;mask of all 1s
1
1 or d1,d0
--- ---
Program ICycles
Words
1 1 sub
2 sub d2,d4
d5,d5 d4.l,d5.h
;shift
;invert mask
;move bits to field
1
Program ICycles
Words
1 1 lsr
lsl #foff,d1
;invert
Program ICycles
Words
1 1 lsr
lsl #foff,d1
;clear
1
B-53