Updated to read CHolesky MO integrals from TREXIO

src/trexio/export_trexio_routines.irp.f

@@ -557,7 +557,7 @@ subroutine export_trexio(update,full_path)
     do k=1,cholesky_ao_num
      do j=1,mo_num
       do i=1,mo_num
-         integral = cholesky_mo(i,j,k)
+         integral = cholesky_mo_transp(k,i,j)
          if (integral == 0.d0) cycle
          icount += 1_8
          chol_buffer(icount) = integral

src/trexio/import_trexio_integrals.irp.f

@@ -28,7 +28,7 @@ subroutine run(f)
   integer(trexio_t), intent(in)  :: f ! TREXIO file handle
   integer(trexio_exit_code)      :: rc
 
-  integer ::i,j,k,l
+  integer :: i,j,k,l, iunit
   integer(8) :: m, n_integrals
   double precision :: integral
 
@@ -41,10 +41,12 @@ subroutine run(f)
   integer         , allocatable :: Vi(:,:)
   double precision              :: s
 
-! TODO:
+  integer*4 :: BUFSIZE
-! - If Cholesky AO in trexio file, read cholesky ao vectors
+  integer :: rank
-! - If Cholesky MO in trexio file, read cholesky mo vectors
+  double precision, allocatable :: tmp(:,:,:)
-! - If Cholesky MO not in trexio file, force do_cholesky_mo to False
+  integer*8 :: offset, icount
+
+  integer, external :: getUnitAndOpen
 
   if (trexio_has_nucleus_repulsion(f) == TREXIO_SUCCESS) then
     rc = trexio_read_nucleus_repulsion(f, s)
@@ -119,16 +121,58 @@ subroutine run(f)
 
   rc = trexio_has_ao_2e_int(f)
   PROVIDE ao_num
+  if (rc /= TREXIO_HAS_NOT) then
+
+      rc = trexio_has_ao_2e_int_eri_cholesky(f)
+      if (rc /= TREXIO_HAS_NOT) then
+
+          rc = trexio_read_ao_2e_int_eri_cholesky_num(f, rank)
+          call trexio_assert(rc, TREXIO_SUCCESS)
+
+          allocate(tmp(ao_num,ao_num,rank))
+          tmp(:,:,:) = 0.d0
+
+          BUFSIZE=ao_num**2
+          allocate(Vi(3,BUFSIZE), V(BUFSIZE))
+
+
+          offset = 0_8
+          icount = BUFSIZE
+          rc = TREXIO_SUCCESS
+          do while (icount == size(V))
+            rc = trexio_read_ao_2e_int_eri_cholesky(f, offset, icount, Vi, V)
+            do m=1,icount
+              i = Vi(1,m)
+              j = Vi(2,m)
+              k = Vi(3,m)
+              integral = V(m)
+              tmp(i,j,k) = integral
+            enddo
+            offset = offset + icount
+            if (rc /= TREXIO_SUCCESS) then
+                exit
+            endif
+          end do
+
+          print *,  'Writing Cholesky AO vectors to disk...'
+          iunit = getUnitAndOpen(trim(ezfio_work_dir)//'cholesky_ao', 'W')
+          write(iunit) rank
+          write(iunit) tmp(:,:,:)
+          close(iunit)
+          call ezfio_set_ao_two_e_ints_io_ao_cholesky('Read')
+
+          deallocate(Vi, V, tmp)
+          print *, 'Cholesky AO integrals read from TREXIO file'
+      endif
+
+      rc = trexio_has_ao_2e_int_eri(f)
       if (rc /= TREXIO_HAS_NOT) then
           PROVIDE ao_integrals_map
 
-      integer*4 :: BUFSIZE
           BUFSIZE=ao_num**2
           allocate(buffer_i(BUFSIZE), buffer_values(BUFSIZE))
           allocate(Vi(4,BUFSIZE), V(BUFSIZE))
 
-      integer*8 :: offset, icount
-
           offset = 0_8
           icount = BUFSIZE
           rc = TREXIO_SUCCESS
@@ -159,6 +203,7 @@ subroutine run(f)
 
           deallocate(buffer_i, buffer_values, Vi, V)
           print *, 'AO integrals read from TREXIO file'
+      endif
   else
       print *, 'AO integrals not found in TREXIO file'
   endif
@@ -186,6 +231,49 @@ subroutine run(f)
   rc = trexio_has_mo_2e_int(f)
   if (rc /= TREXIO_HAS_NOT) then
 
+      rc = trexio_has_mo_2e_int_eri_cholesky(f)
+      if (rc /= TREXIO_HAS_NOT) then
+
+          rc = trexio_read_mo_2e_int_eri_cholesky_num(f, rank)
+          call trexio_assert(rc, TREXIO_SUCCESS)
+
+          allocate(tmp(rank,mo_num,mo_num))
+          tmp(:,:,:) = 0.d0
+
+          BUFSIZE=mo_num**2
+          allocate(Vi(3,BUFSIZE), V(BUFSIZE))
+
+          offset = 0_8
+          icount = BUFSIZE
+          rc = TREXIO_SUCCESS
+          do while (icount == size(V))
+            rc = trexio_read_mo_2e_int_eri_cholesky(f, offset, icount, Vi, V)
+            do m=1,icount
+              i = Vi(1,m)
+              j = Vi(2,m)
+              k = Vi(3,m)
+              integral = V(m)
+              tmp(k,i,j) = integral
+            enddo
+            offset = offset + icount
+            if (rc /= TREXIO_SUCCESS) then
+                exit
+            endif
+          end do
+
+          print *,  'Writing Cholesky MO vectors to disk...'
+          iunit = getUnitAndOpen(trim(ezfio_work_dir)//'cholesky_mo_transp', 'W')
+          write(iunit) rank
+          write(iunit) tmp(:,:,:)
+          close(iunit)
+          call ezfio_set_mo_two_e_ints_io_mo_cholesky('Read')
+
+          deallocate(Vi, V, tmp)
+          print *, 'Cholesky MO integrals read from TREXIO file'
+      endif
+
+      rc = trexio_has_mo_2e_int_eri(f)
+      if (rc /= TREXIO_HAS_NOT) then
           BUFSIZE=mo_num**2
           allocate(buffer_i(BUFSIZE), buffer_values(BUFSIZE))
           allocate(Vi(4,BUFSIZE), V(BUFSIZE))
@@ -220,6 +308,8 @@ subroutine run(f)
           call ezfio_set_mo_two_e_ints_io_mo_two_e_integrals('Read')
           deallocate(buffer_i, buffer_values, Vi, V)
           print *, 'MO integrals read from TREXIO file'
+      endif
+
   else
       print *, 'MO integrals not found in TREXIO file'
   endif