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139 lines (126 loc) · 3.67 KB
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/* ----------------------------------------------------------------------
miniMD is a simple, parallel molecular dynamics (MD) code. miniMD is
an MD microapplication in the Mantevo project at Sandia National
Laboratories ( http://www.mantevo.org ). The primary
authors of miniMD are Steve Plimpton (sjplimp@sandia.gov), Paul Crozier
(pscrozi@sandia.gov) and Christian Trott (crtrott@sandia.gov).
Copyright (2008) Sandia Corporation. Under the terms of Contract
DE-AC04-94AL85000 with Sandia Corporation, the U.S. Government retains
certain rights in this software. This library is free software; you
can redistribute it and/or modify it under the terms of the GNU Lesser
General Public License as published by the Free Software Foundation;
either version 3 of the License, or (at your option) any later
version.
This library is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this software; if not, write to the Free Software
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
USA. See also: http://www.gnu.org/licenses/lgpl.txt .
For questions, contact Paul S. Crozier (pscrozi@sandia.gov) or
Christian Trott (crtrott@sandia.gov).
Please read the accompanying README and LICENSE files.
---------------------------------------------------------------------- */
#ifndef UTIL_H
#define UTIL_H
#include <cstdarg>
#include <cstdint>
#include <cstdio>
#include <cstdlib>
#if PRECISION == 1
typedef uint32_t CAS_t;
#else
typedef uint64_t CAS_t;
#endif
#ifdef USE_OFFLOAD
#define atomic_add(fptr, x) \
{ \
volatile CAS_t *ptr = (CAS_t*) fptr; \
CAS_t expected, desired; \
do \
{ \
expected = *ptr; \
MMD_float expected_float = *fptr; \
MMD_float desired_float = expected_float + x; \
desired = *((CAS_t*) &desired_float); \
} while(not __sync_bool_compare_and_swap(ptr, expected, desired)); \
}
#else
#define atomic_add(fptr, x) \
{ \
_Pragma("omp atomic") \
*fptr += x; \
}
#endif
inline uint32_t log2_ceil(uint32_t N)
{
if(N == 0)
{
return 0;
}
const uint32_t allbut1 = __builtin_clzl(1);
const uint32_t lz = __builtin_clzl(N);
const uint32_t log2 = allbut1 - lz;
uint32_t cand = 1 << log2;
if(N > cand)
{
return log2 + 1;
}
return log2;
}
template <typename T>
void blelloch_excl_scan_target_inplace(T *data, int N)
{
const int levels = log2_ceil(N);
#ifndef USE_OFFLOAD
#pragma omp parallel
#endif
{
#ifdef USE_OFFLOAD
#pragma omp target teams distribute parallel for
#else
#pragma omp for
#endif
for(int i = 0; i < N - 1; i += 2)
{
data[i + 1] = data[i] + data[i + 1];
}
for(int l = 1; l < levels; ++l)
{
const int stride = 1 << (l + 1);
#ifdef USE_OFFLOAD
#pragma omp target teams distribute parallel for
#else
#pragma omp for
#endif
for(int i = stride - 1; i < N; i += stride)
{
data[i] = data[i - stride / 2] + data[i];
}
}
for(int l = levels - 2; l >= 0; --l)
{
const int stride = 1 << (l + 1);
#ifdef USE_OFFLOAD
#pragma omp target teams distribute parallel for
#else
#pragma omp for
#endif
for(int i = stride + stride / 2 - 1; i < N; i += stride)
{
data[i] = data[i - stride / 2] + data[i];
}
}
}
}
static void die(const char *format, ...)
{
va_list args;
va_start(args, format);
vfprintf(stderr, format, args);
va_end(args);
exit(EXIT_FAILURE);
}
#endif