From: Jakub Jelinek <jakub@redhat.com>
Date: Wed, 27 Oct 2021 08:41:59 +0000 (+0200)
Subject: openmp: Document that non-rect loops are not supported in Fortran yet
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8f72cb9bc8842b548916bd263b973ca2c8edbda5;p=thirdparty%2Fgcc.git

openmp: Document that non-rect loops are not supported in Fortran yet

I've found we claim to support non-rectangular loops, but don't actually
support those in Fortran, as can be seen on:
  integer i, j
  !$omp parallel do collapse(2)
  do i = 0, 10
    do j = 0, i
    end do
  end do
end
To support this, the Fortran FE needs to allow the valid forms of
non-rectangular loops and disallow others, so mainly it needs its
updated version of c-omp.c c_omp_check_loop_iv etc., plus for non-rectangular
lb or ub expressions emit a TREE_VEC instead of normal expression as the C/C++ FE
do, plus testsuite coverage.

2021-10-27  Jakub Jelinek  <jakub@redhat.com>

	* libgomp.texi (OpenMP 5.0): Mention that Non-rectangular loop nests
	aren't implemented for Fortran yet.

(cherry picked from commit eef811490646a68c9893968a421b351e7bf704e1)
---

diff --git a/libgomp/ChangeLog.omp b/libgomp/ChangeLog.omp
index c41c2058e4b0..d0e4eb669730 100644
--- a/libgomp/ChangeLog.omp
+++ b/libgomp/ChangeLog.omp
@@ -1,3 +1,11 @@
+2021-10-27  Tobias Burnus  <tobias@codesourcery.com>
+
+	Backported from master:
+	2021-10-27  Jakub Jelinek  <jakub@redhat.com>
+
+	* libgomp.texi (OpenMP 5.0): Mention that Non-rectangular loop nests
+	aren't implemented for Fortran yet.
+
 2021-10-27  Tobias Burnus  <tobias@codesourcery.com>
 
 	Backported from master:
diff --git a/libgomp/libgomp.texi b/libgomp/libgomp.texi
index e6b1b558b6e5..4cb189a128ff 100644
--- a/libgomp/libgomp.texi
+++ b/libgomp/libgomp.texi
@@ -189,7 +189,7 @@ The OpenMP 4.5 specification is fully supported.
 @item @code{requires} directive @tab P
       @tab Only fulfillable requirement is @code{atomic_default_mem_order}
 @item @code{teams} construct outside an enclosing target region @tab Y @tab
-@item Non-rectangular loop nests @tab Y @tab
+@item Non-rectangular loop nests @tab P @tab Only C/C++
 @item @code{!=} as relational-op in canonical loop form for C/C++ @tab Y @tab
 @item @code{nonmonotonic} as default loop schedule modifier for worksharing-loop
       constructs @tab Y @tab