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36 * \brief Define utility routines for SYCL
38 * \author Andrey Alekseenko <al42and@gmail.com>
44 #include "gromacs/utility/smalloc.h"
46 /*! \brief Allocates \p nbytes of host memory. Use \c pfree to free memory allocated with this function.
49 * This function was copied from OpenCL implementation, not tuned for SYCL at all.
50 * Once SYCL2020 is out, might be worthwhile to look into USM and sycl::malloc_host / sycl::aligned_alloc_host.
51 * Overall, it is better to directly use sycl::buffer instead of pinned arrays. But this function
52 * is needed to compile some PME code with SYCL enabled, even if it is never used.
54 * \param[in,out] h_ptr Pointer where to store the address of the newly allocated buffer.
55 * \param[in] nbytes Size in bytes of the buffer to be allocated.
57 void pmalloc(void** h_ptr, size_t nbytes)
59 /* Need a temporary type whose size is 1 byte, so that the
60 * implementation of snew_aligned can cope without issuing
62 auto** temporary = reinterpret_cast<std::byte**>(h_ptr);
64 /* 16-byte alignment inherited from OpenCL and does not sound unreasonable */
65 snew_aligned(*temporary, nbytes, 16);
68 /*! \brief Frees memory allocated with pmalloc.
70 * \param[in] h_ptr Buffer allocated with pmalloc that needs to be freed.
72 void pfree(void* h_ptr)