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>50% acceleration of int.f90

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This commit is contained in:
Thomas Applencourt 2015-05-05 15:19:17 +02:00
parent a8eaf1cfb4
commit 9fb1161a55
1 changed files with 17 additions and 3 deletions
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src/Pseudo_integrals/int.f90
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@ -1905,6 +1905,10 @@ double precision function int_prod_bessel(l,gam,n,m,a,b,arg)
integer n,k,m,q,l,kcp
double precision gam,dblefact,fact,pi,a,b
double precision int,intold,sum,coef_nk,crochet,u,int_prod_bessel_large,freal,arg
double precision dump
double precision, allocatable :: temp_array(:)
logical done
u=(a+b)/(2.d0*dsqrt(gam))
@ -1933,13 +1937,20 @@ double precision function int_prod_bessel(l,gam,n,m,a,b,arg)
done=.false.
kcp=0
allocate( temp_array(0:101))
do while (.not.done)
kcp=kcp+1
sum=0.d0
dump = a**n
do k=q,q+1
temp_array(k) = coef_nk(n,k)*dump*(a**(2*k))
enddo
do k=0,q
sum=sum+coef_nk(n,k)*coef_nk(m,q-k)*a**(n+2*k)*b**(m-2*k+2*q)
sum=sum+temp_array(k)*coef_nk(m,q-k)*b**(m-2*k+2*q)
enddo
int=int+sum*crochet(2*q+n+m+l,gam)
@ -1951,8 +1962,11 @@ double precision function int_prod_bessel(l,gam,n,m,a,b,arg)
q=q+1
intold=int
endif
enddo
deallocate(temp_array)
int_prod_bessel=int*freal
if(kcp.gt.100)then