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// SPDX-License-Identifier: Apache-2.0
//
// Copyright 2008-2016 Conrad Sanderson (http://conradsanderson.id.au)
// Copyright 2008-2016 National ICT Australia (NICTA)
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
// ------------------------------------------------------------------------
//! \addtogroup memory
//! @{
class memory
{
public:
template<typename eT> arma_malloc inline static eT* acquire(const uword n_elem);
template<typename eT> arma_inline static void release(eT* mem);
template<typename eT> arma_inline static bool is_aligned(const eT* mem);
template<typename eT> arma_inline static void mark_as_aligned( eT*& mem);
template<typename eT> arma_inline static void mark_as_aligned(const eT*& mem);
};
template<typename eT>
arma_malloc
inline
eT*
memory::acquire(const uword n_elem)
{
if(n_elem == 0) { return nullptr; }
arma_debug_check
(
( size_t(n_elem) > (std::numeric_limits<size_t>::max() / sizeof(eT)) ),
"arma::memory::acquire(): requested size is too large"
);
eT* out_memptr;
#if defined(ARMA_ALIEN_MEM_ALLOC_FUNCTION)
{
out_memptr = (eT *) ARMA_ALIEN_MEM_ALLOC_FUNCTION(sizeof(eT)*n_elem);
}
#elif defined(ARMA_USE_TBB_ALLOC)
{
out_memptr = (eT *) scalable_malloc(sizeof(eT)*n_elem);
}
#elif defined(ARMA_USE_MKL_ALLOC)
{
out_memptr = (eT *) mkl_malloc( sizeof(eT)*n_elem, 32 );
}
#elif defined(ARMA_HAVE_POSIX_MEMALIGN)
{
eT* memptr = nullptr;
const size_t n_bytes = sizeof(eT)*size_t(n_elem);
const size_t alignment = (n_bytes >= size_t(1024)) ? size_t(32) : size_t(16);
// TODO: investigate apparent memory leak when using alignment >= 64 (as shown on Fedora 28, glibc 2.27)
int status = posix_memalign((void **)&memptr, ( (alignment >= sizeof(void*)) ? alignment : sizeof(void*) ), n_bytes);
out_memptr = (status == 0) ? memptr : nullptr;
}
#elif defined(_MSC_VER)
{
// Windoze is too primitive to handle C++17 std::aligned_alloc()
//out_memptr = (eT *) malloc(sizeof(eT)*n_elem);
//out_memptr = (eT *) _aligned_malloc( sizeof(eT)*n_elem, 16 ); // lives in malloc.h
const size_t n_bytes = sizeof(eT)*size_t(n_elem);
const size_t alignment = (n_bytes >= size_t(1024)) ? size_t(32) : size_t(16);
out_memptr = (eT *) _aligned_malloc( n_bytes, alignment );
}
#else
{
//return ( new(std::nothrow) eT[n_elem] );
out_memptr = (eT *) malloc(sizeof(eT)*n_elem);
}
#endif
// TODO: for mingw, use __mingw_aligned_malloc
arma_check_bad_alloc( (out_memptr == nullptr), "arma::memory::acquire(): out of memory" );
return out_memptr;
}
template<typename eT>
arma_inline
void
memory::release(eT* mem)
{
if(mem == nullptr) { return; }
#if defined(ARMA_ALIEN_MEM_FREE_FUNCTION)
{
ARMA_ALIEN_MEM_FREE_FUNCTION( (void *)(mem) );
}
#elif defined(ARMA_USE_TBB_ALLOC)
{
scalable_free( (void *)(mem) );
}
#elif defined(ARMA_USE_MKL_ALLOC)
{
mkl_free( (void *)(mem) );
}
#elif defined(ARMA_HAVE_POSIX_MEMALIGN)
{
free( (void *)(mem) );
}
#elif defined(_MSC_VER)
{
//free( (void *)(mem) );
_aligned_free( (void *)(mem) );
}
#else
{
//delete [] mem;
free( (void *)(mem) );
}
#endif
// TODO: for mingw, use __mingw_aligned_free
}
template<typename eT>
arma_inline
bool
memory::is_aligned(const eT* mem)
{
#if (defined(ARMA_HAVE_ICC_ASSUME_ALIGNED) || defined(ARMA_HAVE_GCC_ASSUME_ALIGNED)) && !defined(ARMA_DONT_CHECK_ALIGNMENT)
{
return (sizeof(std::size_t) >= sizeof(eT*)) ? ((std::size_t(mem) & 0x0F) == 0) : false;
}
#else
{
arma_ignore(mem);
return false;
}
#endif
}
template<typename eT>
arma_inline
void
memory::mark_as_aligned(eT*& mem)
{
#if defined(ARMA_HAVE_ICC_ASSUME_ALIGNED)
{
__assume_aligned(mem, 16);
}
#elif defined(ARMA_HAVE_GCC_ASSUME_ALIGNED)
{
mem = (eT*)__builtin_assume_aligned(mem, 16);
}
#else
{
arma_ignore(mem);
}
#endif
// TODO: look into C++20 std::assume_aligned()
// TODO: https://en.cppreference.com/w/cpp/memory/assume_aligned
// TODO: MSVC? __assume( (mem & 0x0F) == 0 );
//
// http://comments.gmane.org/gmane.comp.gcc.patches/239430
// GCC __builtin_assume_aligned is similar to ICC's __assume_aligned,
// so for lvalue first argument ICC's __assume_aligned can be emulated using
// #define __assume_aligned(lvalueptr, align) lvalueptr = __builtin_assume_aligned (lvalueptr, align)
//
// http://www.inf.ethz.ch/personal/markusp/teaching/263-2300-ETH-spring11/slides/class19.pdf
// http://software.intel.com/sites/products/documentation/hpc/composerxe/en-us/cpp/lin/index.htm
// http://d3f8ykwhia686p.cloudfront.net/1live/intel/CompilerAutovectorizationGuide.pdf
}
template<typename eT>
arma_inline
void
memory::mark_as_aligned(const eT*& mem)
{
#if defined(ARMA_HAVE_ICC_ASSUME_ALIGNED)
{
__assume_aligned(mem, 16);
}
#elif defined(ARMA_HAVE_GCC_ASSUME_ALIGNED)
{
mem = (const eT*)__builtin_assume_aligned(mem, 16);
}
#else
{
arma_ignore(mem);
}
#endif
}
//! @}
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