[FORTRAN PATCH] Reduce gfc_match_strings usage (part 2)

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

This is more ambitious patch proposes eliminating the intrinsic_operators
table from the gfortran front-end, and instead using a more efficient
pattern matcher implementation in gfc_match_intrinsic_op.  In addition to
the expected performance improvement, this implementation simplifies the
task of adding support for ".xor." as a GNU fortran extension.

The following patch has been tested on x86_64-unknown-linux-gnu with a
full "make bootstrap", all languages including fortran, and regression
tested with a top-level "make -k check" with no new failures.

Ok for mainline?


2007-03-10  Roger Sayle  <roger@eyesopen.com>

        * match.c (intrinsic_operators): Delete.
        (gfc_op2string): New switch based implementation.
        (gfc_match_intrinsic_op): Rewrite matcher to avoid calling
        gfc_match_strings.
        * gfortran.h (intrinsic_operators): Remove prototype.
        (gfc_op2string): Change macro to function prototype.

Roger
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Attachment: patchf3.txt
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