1#if defined(XLF14) || defined(XLFLINUX) 2@PROCESS OPT(0) STRICT(ALL) 3#endif 4 subroutine dpssf4 (ido,l1,cc,ch,wa1,wa2,wa3) 5* 6* $Id$ 7* 8 double precision cc(ido,4,l1), ch(ido,l1,4), wa1(1), wa2(1), 9 1 wa3(1), ci2, ci3, ci4, cr2, cr3, cr4, ti1, ti2, ti3, ti4, 10 2 tr1, tr2, tr3, tr4 11c 12 if (ido .ne. 2) go to 102 13 do 101 k=1,l1 14 ti1 = cc(2,1,k)-cc(2,3,k) 15 ti2 = cc(2,1,k)+cc(2,3,k) 16 tr4 = cc(2,2,k)-cc(2,4,k) 17 ti3 = cc(2,2,k)+cc(2,4,k) 18 tr1 = cc(1,1,k)-cc(1,3,k) 19 tr2 = cc(1,1,k)+cc(1,3,k) 20 ti4 = cc(1,4,k)-cc(1,2,k) 21 tr3 = cc(1,2,k)+cc(1,4,k) 22 ch(1,k,1) = tr2+tr3 23 ch(1,k,3) = tr2-tr3 24 ch(2,k,1) = ti2+ti3 25 ch(2,k,3) = ti2-ti3 26 ch(1,k,2) = tr1+tr4 27 ch(1,k,4) = tr1-tr4 28 ch(2,k,2) = ti1+ti4 29 ch(2,k,4) = ti1-ti4 30 101 continue 31 return 32c 33 102 do 104 k=1,l1 34 do 103 i=2,ido,2 35 ti1 = cc(i,1,k)-cc(i,3,k) 36 ti2 = cc(i,1,k)+cc(i,3,k) 37 ti3 = cc(i,2,k)+cc(i,4,k) 38 tr4 = cc(i,2,k)-cc(i,4,k) 39 tr1 = cc(i-1,1,k)-cc(i-1,3,k) 40 tr2 = cc(i-1,1,k)+cc(i-1,3,k) 41 ti4 = cc(i-1,4,k)-cc(i-1,2,k) 42 tr3 = cc(i-1,2,k)+cc(i-1,4,k) 43 ch(i-1,k,1) = tr2+tr3 44 cr3 = tr2-tr3 45 ch(i,k,1) = ti2+ti3 46 ci3 = ti2-ti3 47 cr2 = tr1+tr4 48 cr4 = tr1-tr4 49 ci2 = ti1+ti4 50 ci4 = ti1-ti4 51 ch(i-1,k,2) = wa1(i-1)*cr2+wa1(i)*ci2 52 ch(i,k,2) = wa1(i-1)*ci2-wa1(i)*cr2 53 ch(i-1,k,3) = wa2(i-1)*cr3+wa2(i)*ci3 54 ch(i,k,3) = wa2(i-1)*ci3-wa2(i)*cr3 55 ch(i-1,k,4) = wa3(i-1)*cr4+wa3(i)*ci4 56 ch(i,k,4) = wa3(i-1)*ci4-wa3(i)*cr4 57 103 continue 58 104 continue 59c 60 return 61 end 62