[PATCH, RFC] fortran [was Re: #pragma GCC unroll support]

[Bernhard Reutner-Fischer]

Hi,

Some compilers IIRC use !DIR$ unroll, if memory serves me right then
the DEC compiler had !DEC$ unroll.
We could support one or the other three-letter keyword or maybe not.

I think a combination of unroll and ivdep directives is allowed (at
least in some compilers); TODO.

Not sure what other statements should be annotated with that directive?

I do not like the global variable directive_unroll but is was the easy
way out for cheap warnings.

Untested draft patch, regstrap running over night, depends on Mike's
unroll-5.diffs.txt patch in this thread (
https://gcc.gnu.org/ml/gcc-patches/2015-01/msg02733.html ).

Just stage-1 tinkering here.

Cheers,

Bernhard Reutner-Fischer (1):
  fortran: !GCC$ unroll for DO

 gcc/fortran/decl.c                               | 38 ++++++++++++++++++++
 gcc/fortran/gfortran.h                           |  2 ++
 gcc/fortran/match.h                              |  1 +
 gcc/fortran/parse.c                              | 13 ++++++-
 gcc/fortran/trans-decl.c                         |  7 ++++
 gcc/fortran/trans-stmt.c                         | 14 ++++++++
 gcc/fortran/trans.h                              |  3 ++
 gcc/testsuite/gfortran.dg/directive_unroll_1.f90 | 46 ++++++++++++++++++++++++
 gcc/testsuite/gfortran.dg/directive_unroll_2.f90 | 39 ++++++++++++++++++++
 9 files changed, 162 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/gfortran.dg/directive_unroll_1.f90
 create mode 100644 gcc/testsuite/gfortran.dg/directive_unroll_2.f90

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