Hi,

this is the (hopefully) final implementation of the support for the unrolling 
pragma in the Fortran front-end.  However the documentation is still missing 
because I don't really know where and under which form to put it.

Tested on x86_64-suse-linux, OK for the mainline?


2017-11-25  Bernhard Reutner-Fischer  <aldot@gcc.gnu.org>
            Eric Botcazou  <ebotcazou@adacore.com>

fortran/ChangeLog:
        * array.c (gfc_copy_iterator): Copy unroll field.
        * decl.c (directive_unroll): New global variable.
        (gfc_match_gcc_unroll): New function.
        * gfortran.h (gfc_iterator]): Add unroll field.
        (directive_unroll): Declare:
        * match.c (gfc_match_do): Use memset to initialize the iterator.
        * match.h (gfc_match_gcc_unroll): New prototype.
        * parse.c (decode_gcc_attribute): Match "unroll".
        (parse_do_block): Set iterator's unroll.
        (parse_executable): Diagnose misplaced unroll directive.
        * trans-stmt.c (gfc_trans_simple_do) Annotate loop condition with
        annot_expr_unroll_kind.
        (gfc_trans_do): Likewise.

testsuite/ChangeLog:
        * gfortran.dg/directive_unroll_1.f90: New test.
        * gfortran.dg/directive_unroll_2.f90: Likewise.
        * gfortran.dg/directive_unroll_3.f90: Lkewise.
        * gfortran.dg/directive_unroll_4.f90: Likewise.
        * gfortran.dg/directive_unroll_5.f90: Likewise.

-- 
Eric Botcazou