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/*
* Copyright (c) 2016-2017, NVIDIA CORPORATION. All rights reserved.
*
* NVIDIA CORPORATION and its licensors retain all intellectual property
* and proprietary rights in and to this software, related documentation
* and any modifications thereto. Any use, reproduction, disclosure or
* distribution of this software and related documentation without an express
* license agreement from NVIDIA CORPORATION is strictly prohibited.
*/
#ifndef ALIGNEDALLOCATOR_H
#define ALIGNEDALLOCATOR_H
#include "NvPreprocessor.h"
/**
Aligned allocation. First template argument has the signature of stdlib malloc.
Example using malloc and 16-byte alignment:
// b will lie on a 16-byte boundary and point to 50 bytes of usable memory
void* b = alignedAlloc<malloc,16>(50);
*/
template<void*(*allocFn)(size_t), int A>
void* alignedAlloc(size_t size)
{
NV_COMPILE_TIME_ASSERT(A > 0 && A <= 256);
unsigned char* mem = (unsigned char*)allocFn(size + A);
const unsigned char offset = (unsigned char)((uintptr_t)A - (uintptr_t)mem % A - 1);
mem += offset;
*mem++ = offset;
return mem;
};
/**
Version of alignedAlloc specialized 16-byte aligned allocation.
*/
template<void*(*allocFn)(size_t)>
void* alignedAlloc(size_t size)
{
return alignedAlloc<allocFn, 16>(size);
}
/**
Aligned deallocation. First template argument has the signature of stdlib free.
Memory freed using this function MUST have been allocated using alignedAlloc.
Example using free:
// Using the memory pointer b from the example above (for alignedAlloc)
alignedFree<free>(b);
*/
template<void(*freeFn)(void*)>
void alignedFree(void* block)
{
if (block != nullptr)
{
unsigned char* mem = (unsigned char*)block;
const unsigned char offset = *--mem;
freeFn(mem - offset);
}
};
#endif // ALIGNEDALLOCATOR_H
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