Motorola DSP96002 - Manual (Page 524)

MOTOROLA DSP96002 USER’S MANUAL B-5
B.1.8 N Complex Multiplies
cr(I) + jci(I) = ( ar(I) + jai(I) ) * ( br(I) + jbi(I) ), I=1,...,N
cr(I) = ar(I) * br(I) - ai(I) * bi(I)
ci(I) = ar(I) * bi(I) + ai(I) * br(I)
R1
→
cr,ci R0
→
ar,ai R4
→
br,bi
D5 = ar D6 = bi D4 = br D7 = ai
Program ICycles
Words
move #aaddr,r0 1 1
move #baddr,r4 1 1
move #caddr-1,r1 1 1
move x:(r0),d5.s y:(r4),d6.s 1 1
fmpy.s d6,d5,d1 x:(r4)+,d4.s y:(r0)+,d7.s 1 1
fmpy.s d4,d7,d2 1 1
do #N,_end 2 3
fmpy d6,d7,d2 fadd.s d2,d1 y:(r0),d7.s 1 1
fmpy.s d4,d5,d0 x:(r0)+,d5.s y:(r4),d6.s 1 1
fmpy d6,d5,d1 fsub.s d2,d0 x:(r4)+,d4.s d1.s,y:(r1) 1 1
fmpy.s d4,d7,d2 d0.s,x:(r1)+ 1 1
_end --- ---
Totals: 12 4N+9
(12 4N+9)