zpassb5.f

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      subroutine zpassb5 (ido,l1,cc,ch,wa1,wa2,wa3,wa4)
      implicit double precision (a-h,o-z)
      dimension       cc(ido,5,l1)           ,ch(ido,l1,5)           ,
     1                wa1(1)     ,wa2(1)     ,wa3(1)     ,wa4(1)
      data tr11,ti11,tr12,ti12 /.309016994374947d0,.951056516295154d0,
     1-.809016994374947d0,.587785252292473d0/
      if (ido .ne. 2) go to 102
      do 101 k=1,l1
         ti5 = cc(2,2,k)-cc(2,5,k)
         ti2 = cc(2,2,k)+cc(2,5,k)
         ti4 = cc(2,3,k)-cc(2,4,k)
         ti3 = cc(2,3,k)+cc(2,4,k)
         tr5 = cc(1,2,k)-cc(1,5,k)
         tr2 = cc(1,2,k)+cc(1,5,k)
         tr4 = cc(1,3,k)-cc(1,4,k)
         tr3 = cc(1,3,k)+cc(1,4,k)
         ch(1,k,1) = cc(1,1,k)+tr2+tr3
         ch(2,k,1) = cc(2,1,k)+ti2+ti3
         cr2 = cc(1,1,k)+tr11*tr2+tr12*tr3
         ci2 = cc(2,1,k)+tr11*ti2+tr12*ti3
         cr3 = cc(1,1,k)+tr12*tr2+tr11*tr3
         ci3 = cc(2,1,k)+tr12*ti2+tr11*ti3
         cr5 = ti11*tr5+ti12*tr4
         ci5 = ti11*ti5+ti12*ti4
         cr4 = ti12*tr5-ti11*tr4
         ci4 = ti12*ti5-ti11*ti4
         ch(1,k,2) = cr2-ci5
         ch(1,k,5) = cr2+ci5
         ch(2,k,2) = ci2+cr5
         ch(2,k,3) = ci3+cr4
         ch(1,k,3) = cr3-ci4
         ch(1,k,4) = cr3+ci4
         ch(2,k,4) = ci3-cr4
         ch(2,k,5) = ci2-cr5
  101 continue
      return
  102 do 104 k=1,l1
         do 103 i=2,ido,2
            ti5 = cc(i,2,k)-cc(i,5,k)
            ti2 = cc(i,2,k)+cc(i,5,k)
            ti4 = cc(i,3,k)-cc(i,4,k)
            ti3 = cc(i,3,k)+cc(i,4,k)
            tr5 = cc(i-1,2,k)-cc(i-1,5,k)
            tr2 = cc(i-1,2,k)+cc(i-1,5,k)
            tr4 = cc(i-1,3,k)-cc(i-1,4,k)
            tr3 = cc(i-1,3,k)+cc(i-1,4,k)
            ch(i-1,k,1) = cc(i-1,1,k)+tr2+tr3
            ch(i,k,1) = cc(i,1,k)+ti2+ti3
            cr2 = cc(i-1,1,k)+tr11*tr2+tr12*tr3
            ci2 = cc(i,1,k)+tr11*ti2+tr12*ti3
            cr3 = cc(i-1,1,k)+tr12*tr2+tr11*tr3
            ci3 = cc(i,1,k)+tr12*ti2+tr11*ti3
            cr5 = ti11*tr5+ti12*tr4
            ci5 = ti11*ti5+ti12*ti4
            cr4 = ti12*tr5-ti11*tr4
            ci4 = ti12*ti5-ti11*ti4
            dr3 = cr3-ci4
            dr4 = cr3+ci4
            di3 = ci3+cr4
            di4 = ci3-cr4
            dr5 = cr2+ci5
            dr2 = cr2-ci5
            di5 = ci2-cr5
            di2 = ci2+cr5
            ch(i-1,k,2) = wa1(i-1)*dr2-wa1(i)*di2
            ch(i,k,2) = wa1(i-1)*di2+wa1(i)*dr2
            ch(i-1,k,3) = wa2(i-1)*dr3-wa2(i)*di3
            ch(i,k,3) = wa2(i-1)*di3+wa2(i)*dr3
            ch(i-1,k,4) = wa3(i-1)*dr4-wa3(i)*di4
            ch(i,k,4) = wa3(i-1)*di4+wa3(i)*dr4
            ch(i-1,k,5) = wa4(i-1)*dr5-wa4(i)*di5
            ch(i,k,5) = wa4(i-1)*di5+wa4(i)*dr5
  103    continue
  104 continue
      return
      end