From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from esa4.mentor.iphmx.com (esa4.mentor.iphmx.com [68.232.137.252]) by sourceware.org (Postfix) with ESMTPS id 715913889E2C; Mon, 19 Jun 2023 21:19:46 +0000 (GMT) DMARC-Filter: OpenDMARC Filter v1.4.2 sourceware.org 715913889E2C Authentication-Results: sourceware.org; dmarc=none (p=none dis=none) header.from=codesourcery.com Authentication-Results: sourceware.org; spf=pass smtp.mailfrom=mentor.com X-IronPort-AV: E=Sophos;i="6.00,255,1681200000"; d="scan'208";a="9264466" Received: from orw-gwy-02-in.mentorg.com ([192.94.38.167]) by esa4.mentor.iphmx.com with ESMTP; 19 Jun 2023 13:19:45 -0800 IronPort-SDR: CaAGdjDnWF9i6kZiKa59SkXXzE3bLO3F+xq4Fz/5jOM9NiRx8tz9RcQ3s8kHNfZ61m8qEKn2td twezKvcxyCVmeNHUrS6vrYdPDA1xkTYAbZIp3BDyENC7o1LTQhTQ6Rrcpa9CdQt1FMMXnzoVPv pap/FZpmsdHGa+B91jxrzuiNT19UBUcHZlcVM4MruH4lK3WLc/C+4oal21MgEsDzZ3Flw2iqU+ IS0MSZm30J5u+HmshjceLDXycNOul4VVRD/b8tNo/bOImuND3w370heXkf1nvNvSZbmcwpsdno svU= From: Julian Brown To: CC: , , Subject: [PATCH 13/14] OpenACC: Allow implicit uses of assumed-size arrays in offload regions Date: Mon, 19 Jun 2023 21:17:37 +0000 Message-ID: <2cc6dd851955f96cf0e11c419b5105a5c0be6940.1687201316.git.julian@codesourcery.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Content-Type: text/plain X-Originating-IP: [137.202.0.90] X-ClientProxiedBy: svr-ies-mbx-13.mgc.mentorg.com (139.181.222.13) To svr-ies-mbx-11.mgc.mentorg.com (139.181.222.11) X-Spam-Status: No, score=-11.7 required=5.0 tests=BAYES_00,GIT_PATCH_0,HEADER_FROM_DIFFERENT_DOMAINS,KAM_DMARC_STATUS,SPF_HELO_PASS,SPF_PASS,TXREP,T_SCC_BODY_TEXT_LINE autolearn=ham autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on server2.sourceware.org List-Id: This patch reimplements the functionality of the previously-reverted patch "Assumed-size arrays with non-lexical data mappings". The purpose is to support implicit uses of assumed-size arrays for Fortran when those arrays have already been mapped on the target some other way (e.g. by "acc enter data"). This relates to upstream OpenACC issue 489 (not yet resolved). 2023-06-16 Julian Brown gcc/fortran/ * trans-openmp.cc (gfc_omp_finish_clause): Treat implicitly-mapped assumed-size arrays as zero-sized for OpenACC, rather than an error. gcc/testsuite/ * gfortran.dg/goacc/assumed-size.f90: Don't expect error. libgomp/ * testsuite/libgomp.oacc-fortran/nonlexical-assumed-size-1.f90: New test. * testsuite/libgomp.oacc-fortran/nonlexical-assumed-size-2.f90: New test. --- gcc/fortran/trans-openmp.cc | 16 ++++++-- .../gfortran.dg/goacc/assumed-size.f90 | 4 +- .../nonlexical-assumed-size-1.f90 | 28 +++++++++++++ .../nonlexical-assumed-size-2.f90 | 40 +++++++++++++++++++ 4 files changed, 82 insertions(+), 6 deletions(-) create mode 100644 libgomp/testsuite/libgomp.oacc-fortran/nonlexical-assumed-size-1.f90 create mode 100644 libgomp/testsuite/libgomp.oacc-fortran/nonlexical-assumed-size-2.f90 diff --git a/gcc/fortran/trans-openmp.cc b/gcc/fortran/trans-openmp.cc index 819d79cda28..230cebf250b 100644 --- a/gcc/fortran/trans-openmp.cc +++ b/gcc/fortran/trans-openmp.cc @@ -1587,6 +1587,7 @@ gfc_omp_finish_clause (tree c, gimple_seq *pre_p, bool openacc) return; tree decl = OMP_CLAUSE_DECL (c); + bool assumed_size = false; /* Assumed-size arrays can't be mapped implicitly, they have to be mapped explicitly using array sections. */ @@ -1597,9 +1598,14 @@ gfc_omp_finish_clause (tree c, gimple_seq *pre_p, bool openacc) GFC_TYPE_ARRAY_RANK (TREE_TYPE (decl)) - 1) == NULL) { - error_at (OMP_CLAUSE_LOCATION (c), - "implicit mapping of assumed size array %qD", decl); - return; + if (openacc) + assumed_size = true; + else + { + error_at (OMP_CLAUSE_LOCATION (c), + "implicit mapping of assumed size array %qD", decl); + return; + } } if (OMP_CLAUSE_MAP_KIND (c) == GOMP_MAP_FORCE_DEVICEPTR) @@ -1654,7 +1660,9 @@ gfc_omp_finish_clause (tree c, gimple_seq *pre_p, bool openacc) else { OMP_CLAUSE_DECL (c) = decl; - OMP_CLAUSE_SIZE (c) = NULL_TREE; + OMP_CLAUSE_SIZE (c) = assumed_size ? size_zero_node : NULL_TREE; + if (assumed_size) + OMP_CLAUSE_MAP_MAYBE_ZERO_LENGTH_ARRAY_SECTION (c) = 1; } if (TREE_CODE (TREE_TYPE (orig_decl)) == REFERENCE_TYPE && (GFC_DECL_GET_SCALAR_POINTER (orig_decl) diff --git a/gcc/testsuite/gfortran.dg/goacc/assumed-size.f90 b/gcc/testsuite/gfortran.dg/goacc/assumed-size.f90 index 4fced2e70c9..12f44c4743a 100644 --- a/gcc/testsuite/gfortran.dg/goacc/assumed-size.f90 +++ b/gcc/testsuite/gfortran.dg/goacc/assumed-size.f90 @@ -4,7 +4,8 @@ ! exit data, respectively. ! This does not appear to be supported by the OpenACC standard as of version -! 3.0. Check for an appropriate error message. +! 3.0. There is however real-world code that relies on this working, so we +! make an attempt to support it. program test implicit none @@ -26,7 +27,6 @@ subroutine dtest (a, n) !$acc enter data copyin(a(1:n)) !$acc parallel loop -! { dg-error {implicit mapping of assumed size array 'a'} "" { target *-*-* } .-1 } do i = 1, n a(i) = i end do diff --git a/libgomp/testsuite/libgomp.oacc-fortran/nonlexical-assumed-size-1.f90 b/libgomp/testsuite/libgomp.oacc-fortran/nonlexical-assumed-size-1.f90 new file mode 100644 index 00000000000..4b61e1cee9b --- /dev/null +++ b/libgomp/testsuite/libgomp.oacc-fortran/nonlexical-assumed-size-1.f90 @@ -0,0 +1,28 @@ +! { dg-do run } + +program p +implicit none +integer :: myarr(10) + +myarr = 0 + +call subr(myarr) + +if (myarr(5).ne.5) stop 1 + +contains + +subroutine subr(arr) +implicit none +integer :: arr(*) + +!$acc enter data copyin(arr(1:10)) + +!$acc serial +arr(5) = 5 +!$acc end serial + +!$acc exit data copyout(arr(1:10)) + +end subroutine subr +end program p diff --git a/libgomp/testsuite/libgomp.oacc-fortran/nonlexical-assumed-size-2.f90 b/libgomp/testsuite/libgomp.oacc-fortran/nonlexical-assumed-size-2.f90 new file mode 100644 index 00000000000..daf7089915f --- /dev/null +++ b/libgomp/testsuite/libgomp.oacc-fortran/nonlexical-assumed-size-2.f90 @@ -0,0 +1,40 @@ +! { dg-do run } + +program p +implicit none +integer :: myarr(10) + +myarr = 0 + +call subr(myarr) + +if (myarr(5).ne.5) stop 1 + +contains + +subroutine subr(arr) +implicit none +integer :: arr(*) + +! At first glance, it might not be obvious how this works. The "enter data" +! and "exit data" operations expand to a pair of mapping nodes for OpenACC, +! GOMP_MAP_{TO/FROM} and GOMP_MAP_POINTER. The former maps the array data, +! and the latter creates a separate mapping on the target for the pointer +! itself with a bias so it represents the "zeroth" element. + +!$acc enter data copyin(arr(2:8)) + +! ...then this implicit mapping creates a zero-length array section +! (GOMP_MAP_ZERO_LEN_ARRAY_SECTION) followed by another GOMP_MAP_POINTER for +! 'arr'. But now that pointer is already "present" on the target, so is not +! overwritten. + +!$acc serial +! This access is then done via the on-target pointer. +arr(5) = 5 +!$acc end serial + +!$acc exit data copyout(arr(2:8)) + +end subroutine subr +end program p -- 2.31.1