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Re: [FORTRAN PATCH] Reduce gfc_match_strings usage (part 1)

From: Tobias Schlüter <tobias dot schlueter at physik dot uni-muenchen dot de>
To: Bud Davis <bdavis9659 at sbcglobal dot net>
Cc: FX Coudert <fxcoudert at gmail dot com>, Roger Sayle <roger at eyesopen dot com>, fortran at gcc dot gnu dot org, gcc-patches at gcc dot gnu dot org
Date: Sun, 11 Mar 2007 17:48:26 +0100
Subject: Re: [FORTRAN PATCH] Reduce gfc_match_strings usage (part 1)
References: <474841.54417.qm@web81204.mail.mud.yahoo.com>

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

References:
- Re: [FORTRAN PATCH] Reduce gfc_match_strings usage (part 1)
  - From: Bud Davis

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