mirror of
https://github.com/LCPQ/quantum_package
synced 2024-06-25 22:52:15 +02:00
106 lines
2.9 KiB
Fortran
106 lines
2.9 KiB
Fortran
use bitmasks
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double precision function integral8(i,j,k,l)
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implicit none
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integer, intent(in) :: i,j,k,l
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double precision, external :: get_mo_bielec_integral
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integral8 = get_mo_bielec_integral(i,j,k,l,mo_integrals_map)
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end function
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BEGIN_PROVIDER [ integer(1), psi_phasemask, (N_int*bit_kind_size, 2, N_det)]
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use bitmasks
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implicit none
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integer :: i
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do i=1, N_det
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call get_mask_phase(psi_det_sorted(1,1,i), psi_phasemask(1,1,i))
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end do
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END_PROVIDER
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subroutine assert(cond, msg)
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character(*), intent(in) :: msg
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logical, intent(in) :: cond
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if(.not. cond) then
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print *, "assert fail: "//msg
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stop
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end if
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end subroutine
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subroutine get_mask_phase(det, phasemask)
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use bitmasks
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implicit none
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integer(bit_kind), intent(in) :: det(N_int, 2)
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integer(1), intent(out) :: phasemask(N_int*bit_kind_size, 2)
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integer :: s, ni, i
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logical :: change
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phasemask = 0_1
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do s=1,2
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change = .false.
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do ni=1,N_int
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do i=0,bit_kind_size-1
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if(BTEST(det(ni, s), i)) change = .not. change
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if(change) phasemask((ni-1)*bit_kind_size + i + 1, s) = 1_1
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end do
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end do
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end do
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end subroutine
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subroutine select_connected(i_generator,E0,pt2,b,subset)
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use bitmasks
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use selection_types
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implicit none
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integer, intent(in) :: i_generator, subset
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type(selection_buffer), intent(inout) :: b
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double precision, intent(inout) :: pt2(N_states)
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integer :: k,l
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double precision, intent(in) :: E0(N_states)
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integer(bit_kind) :: hole_mask(N_int,2), particle_mask(N_int,2)
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double precision :: fock_diag_tmp(2,mo_tot_num+1)
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call build_fock_tmp(fock_diag_tmp,psi_det_generators(1,1,i_generator),N_int)
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do l=1,N_generators_bitmask
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do k=1,N_int
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hole_mask(k,1) = iand(generators_bitmask(k,1,s_hole,l), psi_det_generators(k,1,i_generator))
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hole_mask(k,2) = iand(generators_bitmask(k,2,s_hole,l), psi_det_generators(k,2,i_generator))
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particle_mask(k,1) = iand(generators_bitmask(k,1,s_part,l), not(psi_det_generators(k,1,i_generator)) )
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particle_mask(k,2) = iand(generators_bitmask(k,2,s_part,l), not(psi_det_generators(k,2,i_generator)) )
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enddo
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call select_doubles(i_generator,hole_mask,particle_mask,fock_diag_tmp,E0,pt2,b,subset)
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enddo
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end subroutine
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double precision function get_phase_bi(phasemask, s1, s2, h1, p1, h2, p2)
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use bitmasks
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implicit none
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integer(1), intent(in) :: phasemask(N_int*bit_kind_size, 2)
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integer, intent(in) :: s1, s2, h1, h2, p1, p2
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logical :: change
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integer(1) :: np
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double precision, parameter :: res(0:1) = (/1d0, -1d0/)
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np = phasemask(h1,s1) + phasemask(p1,s1) + phasemask(h2,s2) + phasemask(p2,s2)
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if(p1 < h1) np = np + 1_1
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if(p2 < h2) np = np + 1_1
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if(s1 == s2 .and. max(h1, p1) > min(h2, p2)) np = np + 1_1
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get_phase_bi = res(iand(np,1_1))
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end subroutine
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