[FORTRAN PATCH] Reduce gfc_match_strings usage (part 1)

[Tobias Schlüter]

Bud Davis wrote:
> --- FX Coudert <fxcoudert@gmail.com> wrote:
>> A few days ago, I was wondering how much we could
>> improve gfortran's  
>> compilation speed,  
> 
> 
> with the results shown, the answer seems to be 'not
> much'.  my usual response when see in a gprof output
> like this is to give up....  there will be a lot of
> work for a couple of percent.
> 
> when i optimise, i like to see gains in the X 5 or  X
> 30 range, not in + 0.03 .   :):)

There's one well-known quadratic bottleneck, which is only relevant for 
legacy codes: the resoultion of labels and GOTOs, see PR 18937.  I've 
never felt bothered enough to actually pull this through, but the gains 
could be quite significant for some users.

- Tobi