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update_halo_kernel.f90
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update_halo_kernel.f90
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!Crown Copyright 2014 AWE.
!
! This file is part of TeaLeaf.
!
! TeaLeaf is free software: you can redistribute it and/or modify it under
! the terms of the GNU General Public License as published by the
! Free Software Foundation, either version 3 of the License, or (at your option)
! any later version.
!
! TeaLeaf is distributed in the hope that it will be useful, but
! WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
! FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more
! details.
!
! You should have received a copy of the GNU General Public License along with
! TeaLeaf. If not, see http://www.gnu.org/licenses/.
!> @brief Fortran kernel to update the external halo cells in a chunk.
!> @author David Beckingsale, Wayne Gaudin
!> @details Updates halo cells for the required fields at the required depth
!> for any halo cells that lie on an external boundary. The location and type
!> of data governs how this is carried out. External boundaries are always
!> reflective.
MODULE update_halo_kernel_module
CONTAINS
SUBROUTINE update_halo_kernel(x_min,x_max,y_min,y_max, &
left,bottom,right,top, &
left_boundary,bottom_boundary,right_boundary,top_boundary, &
chunk_neighbours, &
density, &
energy0, &
energy1, &
u, &
p, &
sd, &
fields, &
depth )
IMPLICIT NONE
INTEGER :: x_min,x_max,y_min,y_max
INTEGER :: left,bottom,right,top
INTEGER :: left_boundary,bottom_boundary,right_boundary,top_boundary
INTEGER, DIMENSION(4) :: chunk_neighbours
REAL(KIND=8), DIMENSION(x_min-2:x_max+2,y_min-2:y_max+2) :: density,energy0,energy1
REAL(KIND=8), DIMENSION(x_min-2:x_max+2,y_min-2:y_max+2) :: u, p, sd
! These need to be kept consistent with the data module to avoid use statement
INTEGER, PARAMETER :: CHUNK_LEFT =1 &
,CHUNK_RIGHT =2 &
,CHUNK_BOTTOM =3 &
,CHUNK_TOP =4 &
,EXTERNAL_FACE=-1
INTEGER, PARAMETER :: FIELD_DENSITY = 1 &
,FIELD_ENERGY0 = 2 &
,FIELD_ENERGY1 = 3 &
,FIELD_U = 4 &
,FIELD_P = 5 &
,FIELD_SD = 6 &
,NUM_FIELDS = 6
INTEGER :: fields(NUM_FIELDS),depth
INTEGER :: j,k
!$OMP PARALLEL PRIVATE(j)
! Update values in external halo cells based on depth and fields requested
! Even though half of these loops look the wrong way around, it should be noted
! that depth is either 1 or 2 so that it is more efficient to always thread
! loop along the mesh edge.
IF(fields(FIELD_DENSITY).EQ.1) THEN
IF(chunk_neighbours(CHUNK_BOTTOM).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO j=x_min-depth,x_max+depth
DO k=1,depth
density(j,1-k)=density(j,0+k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
IF(chunk_neighbours(CHUNK_TOP).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO j=x_min-depth,x_max+depth
DO k=1,depth
density(j,y_max+k)=density(j,y_max+1-k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
IF(chunk_neighbours(CHUNK_LEFT).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO k=y_min-depth,y_max+depth
DO j=1,depth
density(1-j,k)=density(0+j,k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
IF(chunk_neighbours(CHUNK_RIGHT).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO k=y_min-depth,y_max+depth
DO j=1,depth
density(x_max+j,k)=density(x_max+1-j,k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
ENDIF
IF(fields(FIELD_ENERGY0).EQ.1) THEN
IF(chunk_neighbours(CHUNK_BOTTOM).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO j=x_min-depth,x_max+depth
DO k=1,depth
energy0(j,1-k)=energy0(j,0+k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
IF(chunk_neighbours(CHUNK_TOP).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO j=x_min-depth,x_max+depth
DO k=1,depth
energy0(j,y_max+k)=energy0(j,y_max+1-k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
IF(chunk_neighbours(CHUNK_LEFT).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO k=y_min-depth,y_max+depth
DO j=1,depth
energy0(1-j,k)=energy0(0+j,k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
IF(chunk_neighbours(CHUNK_RIGHT).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO k=y_min-depth,y_max+depth
DO j=1,depth
energy0(x_max+j,k)=energy0(x_max+1-j,k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
ENDIF
IF(fields(FIELD_ENERGY1).EQ.1) THEN
IF(chunk_neighbours(CHUNK_BOTTOM).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO j=x_min-depth,x_max+depth
DO k=1,depth
energy1(j,1-k)=energy1(j,0+k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
IF(chunk_neighbours(CHUNK_TOP).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO j=x_min-depth,x_max+depth
DO k=1,depth
energy1(j,y_max+k)=energy1(j,y_max+1-k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
IF(chunk_neighbours(CHUNK_LEFT).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO k=y_min-depth,y_max+depth
DO j=1,depth
energy1(1-j,k)=energy1(0+j,k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
IF(chunk_neighbours(CHUNK_RIGHT).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO k=y_min-depth,y_max+depth
DO j=1,depth
energy1(x_max+j,k)=energy1(x_max+1-j,k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
ENDIF
IF(fields(FIELD_U).EQ.1) THEN
IF(chunk_neighbours(CHUNK_BOTTOM).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO k=1,depth
DO j=x_min-depth,x_max+depth
u(j,1-k)=u(j,0+k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
IF(chunk_neighbours(CHUNK_TOP).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO k=1,depth
DO j=x_min-depth,x_max+depth
u(j,y_max+k)=u(j,y_max+1-k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
IF(chunk_neighbours(CHUNK_LEFT).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO k=y_min-depth,y_max+depth
DO j=1,depth
u(1-j,k)=u(0+j,k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
IF(chunk_neighbours(CHUNK_RIGHT).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO k=y_min-depth,y_max+depth
DO j=1,depth
u(x_max+j,k)=u(x_max+1-j,k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
ENDIF
IF(fields(FIELD_p).EQ.1) THEN
IF(chunk_neighbours(CHUNK_BOTTOM).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO k=1,depth
DO j=x_min-depth,x_max+depth
p(j,1-k)=p(j,0+k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
IF(chunk_neighbours(CHUNK_TOP).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO k=1,depth
DO j=x_min-depth,x_max+depth
p(j,y_max+k)=p(j,y_max+1-k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
IF(chunk_neighbours(CHUNK_LEFT).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO k=y_min-depth,y_max+depth
DO j=1,depth
p(1-j,k)=p(0+j,k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
IF(chunk_neighbours(CHUNK_RIGHT).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO k=y_min-depth,y_max+depth
DO j=1,depth
p(x_max+j,k)=p(x_max+1-j,k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
ENDIF
IF(fields(FIELD_sd).EQ.1) THEN
IF(chunk_neighbours(CHUNK_BOTTOM).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO k=1,depth
DO j=x_min-depth,x_max+depth
sd(j,1-k)=sd(j,0+k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
IF(chunk_neighbours(CHUNK_TOP).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO k=1,depth
DO j=x_min-depth,x_max+depth
sd(j,y_max+k)=sd(j,y_max+1-k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
IF(chunk_neighbours(CHUNK_LEFT).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO k=y_min-depth,y_max+depth
DO j=1,depth
sd(1-j,k)=sd(0+j,k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
IF(chunk_neighbours(CHUNK_RIGHT).EQ.EXTERNAL_FACE) THEN
!$OMP DO
DO k=y_min-depth,y_max+depth
DO j=1,depth
sd(x_max+j,k)=sd(x_max+1-j,k)
ENDDO
ENDDO
!$OMP END DO
ENDIF
ENDIF
!$OMP END PARALLEL
END SUBROUTINE update_halo_kernel
END MODULE update_halo_kernel_module