Motorola DSP96002 User Manual page 571

3. Dynamic bit field extraction, zero extend. Register d1.l contains FOFF,
d2.l contains FSIZE.
move
d2,d3
d3.l,d4.h
;move 32-fsize-foff
off upper bits
1
Totals:
4. Dynamic bit field extraction, sign extend. Register d1.l contains FOFF,
d2.l contains FSIZE.
move
d2,d3
d3.l,d4.h
;move 32-fsize-foff
off upper bits
1
Totals:
5. Static bit field insertion.
move
#32-fsize,d2
(fsize+foff),d2
;clear field
field to insert
field
B-52
#32,d3.l
;32-fsize
;32-fsize-foff, 32-fsize 1
1
1 1
1
6 6
#32,d3.l
;32-fsize
;32-fsize-foff, 32-fsize 1
1
1 1
1
6 6
#-1,d2.l
;keep field fsize long
;move to insertion
1
1 1
1 1
DSP96002 USER'S MANUAL
;register size
1
1
1 lsl d0,d0
lsr d0,d0
--- ---
;register size
1
1
1 lsl d0,d0
asr d0,d0
--- ---
;get all ones mask
1 1
1 lsl #foff,d1
or d1,d0
Program ICycles
Words
1 1
1 sub d1,d3
move d3.l,d0.h
d4.h,d0.h ;shift
;right justify
Program ICycles
Words
1 1
1 sub d1,d3
move d3.l,d0.h
d4.h,d0.h ;shift
;right justify
Program ICycles
Words
1 1 lsl
1 1 lsr
andc d2,d0
;insert bit
--- ---
Totals: 6 6
sub
sub
#32-
;move
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