http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38199
--- Comment #22 from Manfred Schwarb <manfred99 at gmx dot ch> 2013-02-15
10:20:46 UTC ---
Last month I had a private communication with Jerry, whether this bug
can be closed. I decided to add a summary to the bugzilla page:
The fix of Thomas is restricted to scalars and list-io. One could simply
replace buffer by buffer(1) in my test case 2 in comment #1 (using list-io):
!234567
character buffer(1)*100000
integer i,j
DO j=1,9999
write(buffer(1),'(i4)') j
write(*,*) buffer(1)(1:4)
read(buffer,*) i
write(*,*) i
ENDDO
end
And we are again dog slow.
For formatted IO (comment #21), this patch does not help either.
Timings of the above test case:
gfortran4.3: 10.3s
gfortran4.7: 13.5s
gfortran4.8: 15.8s
as comparison, test case 2 of comment #1:
gfortran4.8: 0.26s
Timings for testcase in comment #21:
gfortran4.3: 2.7s
gfortran4.6: 2.7s
gfortran4.7: 4.7s <---
gfortran4.8: 4.0s
