------- Comment #1 from burnus at gcc dot gnu dot org 2007-03-01 19:15 ------- subroutine bar(a,b,n) implicit none integer :: n real :: a(n,n), b(n,n) a = b end subroutine
For that example example, the overhead is even more obvious. One needs to run only: for (int i = 0; i < n*n; i++) a[i] = b[i] However, gfortran generates two loops and a whole stack of temporary variables. Analogously for subroutine bar(a,n) implicit none integer :: n real :: a(n,n) a = 12 end subroutine -- http://gcc.gnu.org/bugzilla/show_bug.cgi?id=31016
