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subroutine passf3 (ido,l1,cc,ch,wa1,wa2)
implicit double precision (a-h,o-z)
dimension cc(ido,3,l1) ,ch(ido,l1,3) ,
1 wa1(1) ,wa2(1)
data taur,taui /-.5d0,-.866025403784439d0/
if (ido .ne. 2) go to 102
do 101 k=1,l1
tr2 = cc(1,2,k)+cc(1,3,k)
cr2 = cc(1,1,k)+taur*tr2
ch(1,k,1) = cc(1,1,k)+tr2
ti2 = cc(2,2,k)+cc(2,3,k)
ci2 = cc(2,1,k)+taur*ti2
ch(2,k,1) = cc(2,1,k)+ti2
cr3 = taui*(cc(1,2,k)-cc(1,3,k))
ci3 = taui*(cc(2,2,k)-cc(2,3,k))
ch(1,k,2) = cr2-ci3
ch(1,k,3) = cr2+ci3
ch(2,k,2) = ci2+cr3
ch(2,k,3) = ci2-cr3
101 continue
return
102 do 104 k=1,l1
do 103 i=2,ido,2
tr2 = cc(i-1,2,k)+cc(i-1,3,k)
cr2 = cc(i-1,1,k)+taur*tr2
ch(i-1,k,1) = cc(i-1,1,k)+tr2
ti2 = cc(i,2,k)+cc(i,3,k)
ci2 = cc(i,1,k)+taur*ti2
ch(i,k,1) = cc(i,1,k)+ti2
cr3 = taui*(cc(i-1,2,k)-cc(i-1,3,k))
ci3 = taui*(cc(i,2,k)-cc(i,3,k))
dr2 = cr2-ci3
dr3 = cr2+ci3
di2 = ci2+cr3
di3 = ci2-cr3
ch(i,k,2) = wa1(i-1)*di2-wa1(i)*dr2
ch(i-1,k,2) = wa1(i-1)*dr2+wa1(i)*di2
ch(i,k,3) = wa2(i-1)*di3-wa2(i)*dr3
ch(i-1,k,3) = wa2(i-1)*dr3+wa2(i)*di3
103 continue
104 continue
return
end
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