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Document Fortran header directive.

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2019-02-20  Martin Liska  <mliska@suse.cz>

	* gfortran.texi: Document Fortran header directive.

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gcc/fortran/ChangeLog
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@ -1,3 +1,7 @@
2019-02-20 Martin Liska <mliska@suse.cz>
* gfortran.texi: Document Fortran header directive.
2019-02-19 Thomas Koenig <tkoenig@gcc.gnu.org>
PR fortran/89384

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gcc/fortran/gfortran.texi
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@ -3505,6 +3505,7 @@ as this requires the new array descriptor.
@menu
* ATTRIBUTES directive::
* UNROLL directive::
* BUILTIN directive::
@end menu
@node ATTRIBUTES directive
@ -3596,6 +3597,25 @@ loop that follows. N is an integer constant specifying the unrolling factor.
The values of 0 and 1 block any unrolling of the loop.
@node BUILTIN directive
@subsection BUILTIN directive
The syntax of the directive is
@code{!GCC$ BUILTIN (B) attributes simd FLAGS IF('target')}
You can use this directive to define which middle-end built-ins provide vector
implementations. @code{B} is name of the middle-end built-in. @code{FLAGS}
are optional and must be either "(inbranch)" or "(notinbranch)".
@code{IF} statement is optional and is used to filter multilib ABIs
for the built-in that should be vectorized. Example usage:
@smallexample
!GCC$ builtin (sinf) attributes simd (notinbranch) if('x86_64')
@end smallexample
The purpose of the directive is to provide an API among the GCC compiler and
the GNU C Library which would define vector implementation of math routines.
@node Non-Fortran Main Program
@section Non-Fortran Main Program