[PATCH] Reduce gfc_match_strings usage

["Roger Sayle" <roger at eyesopen dot com>]

The following patch is a resubmission of my 10th March patch to reduce the
usage of (the inefficient) gfc_match_strings in the gfortran front-end.
http://gcc.gnu.org/ml/fortran/2007-03/msg00226.html

Although this patch was approved back then by Jerry DeLisle in
http://gcc.gnu.org/ml/fortran/2007-03/msg00229.html and it was supported
in principle by FX (who reconfirmed that gfc_match_strings is the
"hottest" CPU hog in the gfortran front-end), it's been a while, so I
thought I'd get it reapproved rather than commit it out of the blue.

The following patch has been retested again current mainline on
x86_64-unknown-linux-gnu, with a full "make bootstrap", including
gfortran, and top-level "make -k check" with no new failures.

Ok for mainline?


2007-08-18  Roger Sayle  <roger@eyesopen.com>

        * primary.c (match_logical_constant_string): New function to match
        a ".true." or a ".false.".
        (match_logical_constant): Use it instead of gfc_match_strings.

Roger
--
Roger Sayle,                         E-mail: roger@eyesopen.com
OpenEye Scientific Software,         WWW: http://www.eyesopen.com/
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