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! version 3; Last Modified: May 7, 2008.
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C
C FFTPACK 5.0
C Copyright (C) 1995-2004, Scientific Computing Division,
C University Corporation for Atmospheric Research
C Licensed under the GNU General Public License (GPL)
C
C Authors: Paul N. Swarztrauber and Richard A. Valent
C
C $Id: cmf4kb_8.ftn,v 1.2 2010/08/20 16:39:32 armaanl Exp $
C
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC
SUBROUTINE CMF4KB_8 (LOT,IDO,L1,NA,CC,IM1,IN1,CH,IM2,IN2,WA) 2
IMPLICIT NONE
#include "taglam4d.cdk"
integer m2s,m1d,in2,k,i,m2,m1,l1,ido,lot,na,im2,in1,im1
REAL*8 CC(2,IN1,L1,IDO,4),CH(2,IN2,L1,4,IDO),WA(IDO,3,2)
real*8 TI1,TI2,TR4,TI3,TR1,TR2,TI4,TR3,CR3,CI3,CR2,CR4,CI2,CI4
C
C FFTPACK 5.0 auxiliary routine
C
M1D = (LOT-1)*IM1+1
M2S = 1-IM2
IF (IDO.GT.1 .OR. NA.EQ.1) GO TO 102
DO 101 K=1,L1
DO 101 M1=1,M1D,IM1
TI1 = CC(2,M1,K,1,1)-CC(2,M1,K,1,3)
TI2 = CC(2,M1,K,1,1)+CC(2,M1,K,1,3)
TR4 = CC(2,M1,K,1,4)-CC(2,M1,K,1,2)
TI3 = CC(2,M1,K,1,2)+CC(2,M1,K,1,4)
TR1 = CC(1,M1,K,1,1)-CC(1,M1,K,1,3)
TR2 = CC(1,M1,K,1,1)+CC(1,M1,K,1,3)
TI4 = CC(1,M1,K,1,2)-CC(1,M1,K,1,4)
TR3 = CC(1,M1,K,1,2)+CC(1,M1,K,1,4)
CC(1,M1,K,1,1) = TR2+TR3
CC(1,M1,K,1,3) = TR2-TR3
CC(2,M1,K,1,1) = TI2+TI3
CC(2,M1,K,1,3) = TI2-TI3
CC(1,M1,K,1,2) = TR1+TR4
CC(1,M1,K,1,4) = TR1-TR4
CC(2,M1,K,1,2) = TI1+TI4
CC(2,M1,K,1,4) = TI1-TI4
101 CONTINUE
RETURN
102 DO 103 K=1,L1
M2 = M2S
DO 103 M1=1,M1D,IM1
M2 = M2+IM2
TI1 = CC(2,M1,K,1,1)-CC(2,M1,K,1,3)
TI2 = CC(2,M1,K,1,1)+CC(2,M1,K,1,3)
TR4 = CC(2,M1,K,1,4)-CC(2,M1,K,1,2)
TI3 = CC(2,M1,K,1,2)+CC(2,M1,K,1,4)
TR1 = CC(1,M1,K,1,1)-CC(1,M1,K,1,3)
TR2 = CC(1,M1,K,1,1)+CC(1,M1,K,1,3)
TI4 = CC(1,M1,K,1,2)-CC(1,M1,K,1,4)
TR3 = CC(1,M1,K,1,2)+CC(1,M1,K,1,4)
CH(1,M2,K,1,1) = TR2+TR3
CH(1,M2,K,3,1) = TR2-TR3
CH(2,M2,K,1,1) = TI2+TI3
CH(2,M2,K,3,1) = TI2-TI3
CH(1,M2,K,2,1) = TR1+TR4
CH(1,M2,K,4,1) = TR1-TR4
CH(2,M2,K,2,1) = TI1+TI4
CH(2,M2,K,4,1) = TI1-TI4
103 CONTINUE
IF(IDO .EQ. 1) RETURN
DO 105 I=2,IDO
DO 104 K=1,L1
M2 = M2S
DO 104 M1=1,M1D,IM1
M2 = M2+IM2
TI1 = CC(2,M1,K,I,1)-CC(2,M1,K,I,3)
TI2 = CC(2,M1,K,I,1)+CC(2,M1,K,I,3)
TI3 = CC(2,M1,K,I,2)+CC(2,M1,K,I,4)
TR4 = CC(2,M1,K,I,4)-CC(2,M1,K,I,2)
TR1 = CC(1,M1,K,I,1)-CC(1,M1,K,I,3)
TR2 = CC(1,M1,K,I,1)+CC(1,M1,K,I,3)
TI4 = CC(1,M1,K,I,2)-CC(1,M1,K,I,4)
TR3 = CC(1,M1,K,I,2)+CC(1,M1,K,I,4)
CH(1,M2,K,1,I) = TR2+TR3
CR3 = TR2-TR3
CH(2,M2,K,1,I) = TI2+TI3
CI3 = TI2-TI3
CR2 = TR1+TR4
CR4 = TR1-TR4
CI2 = TI1+TI4
CI4 = TI1-TI4
CH(1,M2,K,2,I) = WA(I,1,1)*CR2-WA(I,1,2)*CI2
CH(2,M2,K,2,I) = WA(I,1,1)*CI2+WA(I,1,2)*CR2
CH(1,M2,K,3,I) = WA(I,2,1)*CR3-WA(I,2,2)*CI3
CH(2,M2,K,3,I) = WA(I,2,1)*CI3+WA(I,2,2)*CR3
CH(1,M2,K,4,I) = WA(I,3,1)*CR4-WA(I,3,2)*CI4
CH(2,M2,K,4,I) = WA(I,3,1)*CI4+WA(I,3,2)*CR4
104 CONTINUE
105 CONTINUE
RETURN
END