C++*********************************************************************
C
C  CCRD_2.F                      
C              PGI BUG                          FEB 10 2006 ArDean Leith
C              MOD PGI COMPILER BUG             FEB 19 2008 ArDean Leith
C
C **********************************************************************
C=* FROM: SPIDER - MODULAR IMAGE PROCESSING SYSTEM.   AUTHOR: J.FRANK  *
C=* Copyright (C) 1985-2008  Health Research Inc.                      *
C=*                                                                    *
C=* HEALTH RESEARCH INCORPORATED (HRI),                                *   
C=* ONE UNIVERSITY PLACE, RENSSELAER, NY 12144-3455.                   *
C=*                                                                    *
C=* Email:  spider@wadsworth.org                                       *
C=*                                                                    *
C=* This program is free software; you can redistribute it and/or      *
C=* modify it under the terms of the GNU General Public License as     *
C=* published by the Free Software Foundation; either version 2 of the *
C=* License, or (at your option) any later version.                    *
C=*                                                                    *
C=* This program is distributed in the hope that it will be useful,    *
C=* but WITHOUT ANY WARRANTY; without even the implied warranty of     *
C=* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU  *
C=* General Public License for more details.                           *
C=*                                                                    *
C=* You should have received a copy of the GNU General Public License  *
C=* along with this program; if not, write to the                      *
C=* Free Software Foundation, Inc.,                                    *
C=* 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.      *
C=*                                                                    *
C **********************************************************************
C
C  CCRD_2(LUN2,X,BUF,O,LS,NSAM,NROW)
C
C  PURPOSE: CALCULATES CIRCULAR CROSCORRELATION, NON-POWER-OF-TWO 
C           DIMENSIONS
C
C  PARAMETERS:  X  FOURIER TRANSFORM                     (SENT)
C               O  F(X*CONJG(Y))                         (RET.)
C
C23456789012345678901234567890123456789012345678901234567890123456789012
C--*********************************************************************

        SUBROUTINE CCRD_2(LUN2,X,BUF,O, LS,NSAM,NROW)

        COMPLEX          :: X(LS/2,NROW)
        COMPLEX          :: BUF(LS/2) 
        COMPLEX          :: O(LS/2,NROW)

        COMPLEX          :: CTEMP
        DOUBLE PRECISION :: PI2
 
        NNNN = LS / 2
        LRS  = 2 * NNNN

        PI2  = 8.0 * DATAN(1.0D0)
        ITMP = NSAM / 2
        SX   = PI2 * FLOAT(ITMP) / FLOAT(NSAM)
        ITMP = NROW / 2
        SY   = PI2 * FLOAT(ITMP) / FLOAT(NROW)

        DO J=1,NROW
           IY = J - 1
           IF (IY .GT. (NROW/2))  IY=IY - NROW
           ARGY = SY * IY
           CALL REDLIN(LUN2,BUF,LRS,J)

           DO I=1,NNNN
              ARG    = SX * (I-1) + ARGY
C PGI OP64 BUG?: O(I,J) = X(I,J)*CONJG(BUF(I))*CMPLX(COS(ARG),SIN(ARG))
              CTEMP  = CMPLX(COS(ARG),SIN(ARG))
              O(I,J) = X(I,J) * CONJG(BUF(I)) * CTEMP
           ENDDO
        ENDDO

        INS = -1
        CALL FMRS_2(O,NSAM,NROW,INS)

        END