From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id 735633851C1F; Thu, 29 Apr 2021 06:24:33 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 735633851C1F
From: "vries at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug target/100321] [OpenMP][nvptx, SIMT] (Con't) Reduction fails
 with optimization and 'loop'/'for simd' but not with 'for'
Date: Thu, 29 Apr 2021 06:24:33 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: target
X-Bugzilla-Version: 11.0
X-Bugzilla-Keywords: openmp, wrong-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: vries at gcc dot gnu.org
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: short_desc
Message-ID: <bug-100321-4-gxoChGJmp4@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-100321-4@http.gcc.gnu.org/bugzilla/>
References: <bug-100321-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Thu, 29 Apr 2021 06:24:33 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100321

Tom de Vries <vries at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
            Summary|[OpenMP][nvptx] (Con't)     |[OpenMP][nvptx, SIMT]
                   |Reduction fails with        |(Con't) Reduction fails
                   |optimization and            |with optimization and
                   |'loop'/'for simd' but not   |'loop'/'for simd' but not
                   |with 'for'                  |with 'for'

--- Comment #2 from Tom de Vries <vries at gcc dot gnu.org> ---
FTR, example minimized to:
...
// { dg-additional-options "-foffload=3D-latomic" }

#include <iostream>
#include <cstdlib>
#include <cmath>
#include <complex>

using std::complex;

#pragma omp declare reduction(+: complex<int>: omp_out +=3D omp_in)

int
main (void)
{
  const int N0 { 32768 };
  const complex<int> expected_value { N0, 0 };
  complex<int> counter_N0 { 0, 0 };

#pragma omp target
#pragma omp for simd reduction(+: counter_N0)
  for (int i0 =3D 0 ; i0 < N0 ; i0++ )
    counter_N0 +=3D complex<int> { 1, 0 };

  std::cerr << "Expected: " << expected_value  << std::endl;
  std::cerr << "Got     : " << counter_N0 << std::endl;

  return 0;
}
...=