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Rewrite get_phase_qp_to_cfg
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@ -1,9 +1,9 @@
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BEGIN_PROVIDER [ integer, NSOMOMax]
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&BEGIN_PROVIDER [ integer, NCSFMax]
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&BEGIN_PROVIDER [ integer*8, NMO]
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&BEGIN_PROVIDER [ integer, NBFMax]
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&BEGIN_PROVIDER [ integer, n_CSF]
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&BEGIN_PROVIDER [ integer, maxDetDimPerBF]
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&BEGIN_PROVIDER [ integer, NCSFMax]
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&BEGIN_PROVIDER [ integer*8, NMO]
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&BEGIN_PROVIDER [ integer, NBFMax]
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&BEGIN_PROVIDER [ integer, n_CSF]
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&BEGIN_PROVIDER [ integer, maxDetDimPerBF]
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implicit none
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BEGIN_DOC
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! Documentation for NSOMOMax
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@ -44,8 +44,7 @@
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!if(detDimperBF > maxDetDimPerBF) maxDetDimPerBF = detDimperBF
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ncfgprev = cfg_seniority_index(i)
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enddo
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END_PROVIDER
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END_PROVIDER
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subroutine get_phase_qp_to_cfg(Ialpha, Ibeta, phaseout)
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use bitmasks
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@ -62,41 +61,44 @@ subroutine get_phase_qp_to_cfg(Ialpha, Ibeta, phaseout)
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integer(bit_kind),intent(in) :: Ialpha(N_int)
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integer(bit_kind),intent(in) :: Ibeta(N_int)
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real*8,intent(out) :: phaseout
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integer(bit_kind) :: mask(N_int), deta(N_int), detb(N_int)
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integer(bit_kind) :: mask, mask2(N_int), deta(N_int), detb(N_int)
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integer :: nbetas
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integer :: count, k
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if (N_int >1 ) then
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stop 'TODO: get_phase_qp_to_cfg '
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endif
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nbetas = 0
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mask = 0_bit_kind
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count = 0
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deta = Ialpha
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detb = Ibeta
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! remove the domos
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mask = IAND(deta,detb)
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deta = IEOR(deta,mask)
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detb = IEOR(detb,mask)
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mask = 0
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phaseout = 1.0
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k = 1
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do while((deta(k)).GT.0_8)
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mask(k) = ISHFT(1_8,count)
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if(POPCNT(IAND(deta(k),mask(k))).EQ.1)then
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if(IAND(nbetas,1).EQ.0) then
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phaseout *= 1.0d0
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else
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phaseout *= -1.0d0
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! Remove the DOMOs
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mask2 = IAND(Ialpha,Ibeta)
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deta = IEOR(Ialpha,mask2)
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detb = IEOR(Ibeta ,mask2)
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! Find how many alpha electrons there are in all the N_ints
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integer :: Na(N_int)
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do k=1,N_int
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Na(k) = popcnt(deta(k))
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enddo
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integer :: shift, ipos, nperm
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phaseout = 1.d0
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do k=1,N_int
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do while(detb(k) /= 0_bit_kind)
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! Find the lowest beta electron and clear it
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ipos = trailz(detb(k))
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detb(k) = ibclr(detb(k),ipos)
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! Create a mask will all MOs higher than the beta electron
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mask = not(shiftl(1_bit_kind,ipos+1) - 1_bit_kind)
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! Apply the mask to the alpha string to count how many electrons to cross
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nperm = popcnt( iand(mask, deta(k)) )
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! Count how many alpha electrons are above the beta electron in the other integers
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nperm = nperm + sum(Na(k+1:N_int))
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if (iand(nperm,1) == 1) then
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phaseout = -phaseout
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endif
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deta(k) = IEOR(deta(k),mask(k))
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else
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if(POPCNT(IAND(detb(k),mask(k))).EQ.1) then
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nbetas += 1
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detb(k) = IEOR(detb(k),mask(k))
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endif
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endif
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count += 1
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enddo
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enddo
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end subroutine get_phase_qp_to_cfg
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