58 lines
2.0 KiB
C++
58 lines
2.0 KiB
C++
// clang-format off
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/* -*- c++ -*- ----------------------------------------------------------
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LAMMPS - Large-scale Atomic/Molecular Massively Parallel Simulator
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https://www.lammps.org/, Sandia National Laboratories
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LAMMPS development team: developers@lammps.org
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Copyright (2020) Sandia Corporation. Under the terms of Contract
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DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
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certain rights in this software. This software is distributed under
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the GNU General Public License.
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See the README file in the top-level LAMMPS directory.
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------------------------------------------------------------------------- */
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// There is no way to annotate an OpenMP construct that
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// (a) accesses const variables, (b) has default(none),
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// and (c) is valid in both OpenMP 3.0 and 4.0.
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//
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// (in OpenMP 3.0, the const variables have a predetermined
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// sharing attribute and are *forbidden* from being declared
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// in the omp construct. In OpenMP 4.0, this predetermined
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// sharing attribute is removed, and thus they are *required*
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// to be declared in the omp construct)
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//
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// To date, most compilers still accept the OpenMP 3.0 form,
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// so this is what LAMMPS primarily uses. For those compilers
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// that strictly implement OpenMP 4.0 (such as GCC 9.0 and later
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// or Clang 10.0 and later), we give up default(none).
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// autodetect OpenMP compatibility if not explicitly set
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#ifndef LAMMPS_OMP_COMPAT
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# if defined(__INTEL_LLVM_COMPILER)
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# define LAMMPS_OMP_COMPAT 4
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# elif defined(__INTEL_COMPILER)
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# if __INTEL_COMPILER > 18
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# define LAMMPS_OMP_COMPAT 4
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# endif
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# elif defined(__clang__)
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# if __clang_major__ >= 10
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# define LAMMPS_OMP_COMPAT 4
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# endif
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# elif defined(__GNUC__)
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# if __GNUC__ >= 9
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# define LAMMPS_OMP_COMPAT 4
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# endif
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# endif
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#endif
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#if LAMMPS_OMP_COMPAT == 4
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# define LMP_SHARED(...)
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# define LMP_DEFAULT_NONE default(shared)
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#else
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# define LMP_SHARED(...) shared(__VA_ARGS__)
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# define LMP_DEFAULT_NONE default(none)
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#endif
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