[PR fortran/91496] !GCC$ directives error if mistyped or unknown

[Harald Anlauf <anlauf at gmx dot de>]

Dear all,

the attached patch adds Fortran support for the following pragmas
(loop annotations): IVDEP (ignore vector dependencies), VECTOR, and
NOVECTOR.  Furthermore, it downgrades unsupported directives from
error to warning (by default, it stays an error with -pedantic),
thus fixing the PR.

It has no effect on existing code (thus regtested cleanly on
x86_64-pc-linux-gnu), but gives users an option for fine-grained
control of optimization.  The above pragmas are supported by other
compilers (with different sentinels, e.g. !DIR$ for Intel, Cray,
sometimes with slightly different keywords).

OK for trunk, and backport to 9?

Thanks,
Harald


2019-08-26  Harald Anlauf  <anlauf@gmx.de>

	PR fortran/91496
	* gfortran.h: Extend struct gfc_iterator for loop annotations.
	* array.c (gfc_copy_iterator): Copy loop annotations by IVDEP,
	VECTOR, and NOVECTOR pragmas.
	* decl.c (gfc_match_gcc_ivdep, gfc_match_gcc_vector)
	(gfc_match_gcc_novector): New matcher functions handling IVDEP,
	VECTOR, and NOVECTOR pragmas.
	* match.h: Declare prototypes of matcher functions handling IVDEP,
	VECTOR, and NOVECTOR pragmas.
	* parse.c (decode_gcc_attribute, parse_do_block)
	(parse_executable): Decode IVDEP, VECTOR, and NOVECTOR pragmas;
	emit warning for unrecognized pragmas instead of error.
	* trans-stmt.c (gfc_trans_simple_do, gfc_trans_do): Add code to
	emit annotations for IVDEP, VECTOR, and NOVECTOR pragmas.
	* gfortran.texi: Document IVDEP, VECTOR, and NOVECTOR pragmas.

2019-08-26  Harald Anlauf  <anlauf@gmx.de>

	PR fortran/91496
	* gfortran.dg/pr91496.f90: New testcase.

Attachment: patch-pr91496
Description: Text document

Attachment: patch-pr91496-testsuite
Description: Text document