[Bug libfortran/38199] [4.7/4.8/4.9 Regression] missed optimization: I/O performance

[jvdelisle at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=38199

--- Comment #32 from Jerry DeLisle <jvdelisle at gcc dot gnu.org> ---
Created attachment 32312
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=32312&action=edit
New patch for case in comment 21

This is just a preliminary runtime patch.

Without:

real    0m7.519s
user    0m7.496s
sys    0m0.000s

With patch:

real    0m1.433s
user    0m1.424s
sys    0m0.002s

Which is not a bad improvement.  I am still looking at what we could do on the
front-end.