http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50514
kargl at gcc dot gnu.org changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |kargl at gcc dot gnu.org --- Comment #1 from kargl at gcc dot gnu.org 2011-09-25 22:05:14 UTC --- Technically, it the programmer that should check the arguments. The prohibitions in the Fortran Standard are placed on the programmer not the Fortran processor (ie., the compiler). Adding the check into do i = 1,1000000 do j = 1, 1000000 do k = 1, 1000000 ! Some stuff here to compute k and n < bit_size(k) m = ishft(k,n) ! for some k, n ! More stuff here to use m end do end do end do seems like useless overhead.