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!MNH_LIC Copyright 1994-2023 CNRS, Meteo-France and Universite Paul Sabatier
!MNH_LIC This is part of the Meso-NH software governed by the CeCILL-C licence
!MNH_LIC version 1. See LICENSE, CeCILL-C_V1-en.txt and CeCILL-C_V1-fr.txt
!MNH_LIC for details. version 1.
!-----------------------------------------------------------------
! Creation: 22/05/2023
! codes comes from flat_inv.f90 and flat_invz.f90 (deduplication of code)
!-----------------------------------------------------------------
! ##############
MODULE MODE_FFT_TOOLS
! ##############
IMPLICIT NONE
CONTAINS
SUBROUTINE FAST_TRANSPOSE( PX, PXT, KNI, KNJ, KNK )
INTEGER, INTENT(IN) :: KNI, KNJ, KNK ! 3D dimension of X and XT
REAL, DIMENSION(KNI*KNJ,KNK), INTENT(IN) :: PX
REAL, DIMENSION(KNJ*KNI,KNK), INTENT(OUT) :: PXT
INTEGER :: IJI,II,IJ,IIJ ! index in array X and XT
INTEGER :: JK
!$acc data present( PX, PXT )
!$acc kernels
DO JK=1,KNK
! PERMUTATION(PX,PXT)
!CDIR NODEP
!OCL NOVREC
DO IJI = 1, KNJ*KNI
! I,J Indice in XT array from linearised index IJI
II = 1 + (IJI-1)/KNJ
IJ = IJI - (II-1)*KNJ
! linearised index in X
IIJ = II + (IJ-1)*KNI
! transposition
PXT(IJI,JK) = PX(IIJ,JK)
END DO
END DO
!$acc end kernels
!$acc end data
END SUBROUTINE FAST_TRANSPOSE
SUBROUTINE FAST_SUBSTITUTION_3D( PBAND_YR, PBETX, PPBF, PGAM, PPCF, PAF, PBAND_Y, KIY, KJY, KKB, KKE, KKU )
INTEGER, INTENT(IN) :: KIY, KJY, KKB, KKE, KKU
REAL, DIMENSION (KIY*KJY,KKU),INTENT(OUT) :: PBAND_YR, PGAM
REAL, DIMENSION (KIY*KJY,KKU),INTENT(IN) :: PBAND_Y, PPBF, PAF
REAL, DIMENSION (KIY*KJY), INTENT(OUT) :: PBETX
REAL, DIMENSION (KKU), INTENT(IN) :: PPCF
INTEGER :: JK
!$acc data present( PBAND_YR, PGAM, PBAND_Y, PPBF, PAF, PBETX, PPCF )
!$acc kernels
!
! initialization
!
PBAND_YR = 0.0
PBETX(:) = PPBF(:,KKB-1)
PBAND_YR(:,KKB-1) = PBAND_Y(:,KKB-1) &
/ PBETX(:)
PGAM(:,1:KKB-1) = 0.
!
! decomposition and forward substitution
!
DO JK = KKB,KKE+1
PGAM(:,JK) = PPCF(JK-1) / PBETX(:)
!
PBETX(:) = PPBF(:,JK) - &
PAF(:,JK)*PGAM(:,JK)
!
PBAND_YR(:,JK) = ( PBAND_Y(:,JK) - &
PAF(:,JK)*PBAND_YR(:,JK- 1) ) &
/PBETX(:)
!
END DO
!
! backsubstitution
!
DO JK = KKE,KKB-1,-1
PBAND_YR(:,JK) = PBAND_YR(:,JK) - &
PGAM(:,JK+1)*PBAND_YR(:,JK+1)
END DO
!$acc end kernels
!$acc end data
END SUBROUTINE FAST_SUBSTITUTION_3D
SUBROUTINE FAST_SUBSTITUTION_2D( PBAND_YR, PBETX, PPBF, PGAM, PPCF, PAF, PBAND_Y, KIY, KJY, KKB, KKE, KKU )
INTEGER, INTENT(IN) :: KIY, KJY, KKB, KKE, KKU
REAL, DIMENSION(KIY,KJY,KKU), INTENT(OUT) :: PBAND_YR
REAL, DIMENSION(KIY,KJY,KKU), INTENT(IN) :: PBAND_Y
REAL, DIMENSION(KIY,KJY,KKU), INTENT(IN) :: PPBF
REAL, DIMENSION(KIY,KJY,KKU), INTENT(INOUT) :: PGAM
REAL, DIMENSION(KIY,KJY,KKU), INTENT(IN) :: PAF
REAL, DIMENSION(KIY,KJY), INTENT(INOUT) :: PBETX
REAL, DIMENSION(KKU), INTENT(IN) :: PPCF
INTEGER :: JK
!$acc data present( PBAND_YR, PGAM, PBAND_Y, PPBF, PAF, PBETX, PPCF )
!$acc kernels
!
! initialization
!
PBAND_YR = 0.0
PBETX(:,1) = PPBF(:,1,KKB-1)
PBAND_YR(:,1,KKB-1) = PBAND_Y(:,1,KKB-1) &
/ PBETX(:,1)
!
! decomposition and forward substitution
!
DO JK = KKB,KKE+1
PGAM(:,1,JK) = PPCF(JK-1) / PBETX(:,1)
!
PBETX(:,1) = PPBF(:,1,JK) - &
PAF(:,1,JK)*PGAM(:,1,JK)
!
PBAND_YR(:,1,JK) = ( PBAND_Y(:,1,JK) - &
PAF(:,1,JK)*PBAND_YR(:,1,JK- 1) ) &
/PBETX(:,1)
!
END DO
!
! backsubstitution
!
DO JK = KKE,KKB-1,-1
PBAND_YR(:,1,JK) = PBAND_YR(:,1,JK) - &
PGAM(:,1,JK+1)*PBAND_YR(:,1,JK+1)
END DO
!$acc end kernels
!$acc end data
END SUBROUTINE FAST_SUBSTITUTION_2D
SUBROUTINE FAST_SPREAD( PTAB1D, PTAB3D, KIY, KJY, KKU )
INTEGER, INTENT(IN) :: KIY, KJY, KKU
REAL, DIMENSION(KKU), INTENT(IN) :: PTAB1D
REAL, DIMENSION(KIY*KJY,KKU), INTENT(OUT) :: PTAB3D
INTEGER :: JIJ,JK
!$acc data present( PTAB1D, PTAB3D )
!$acc kernels
DO JK=1,KKU
DO JIJ=1,KIY*KJY
PTAB3D(JIJ,JK) = PTAB1D(JK)
END DO
END DO
!$acc end kernels
!$acc end data
END SUBROUTINE FAST_SPREAD
END MODULE MODE_FFT_TOOLS