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Diffstat (limited to 'NvBlast/test/src/AlignedAllocator.h')
| -rw-r--r-- | NvBlast/test/src/AlignedAllocator.h | 69 |
1 files changed, 69 insertions, 0 deletions
diff --git a/NvBlast/test/src/AlignedAllocator.h b/NvBlast/test/src/AlignedAllocator.h new file mode 100644 index 0000000..f8bf3a5 --- /dev/null +++ b/NvBlast/test/src/AlignedAllocator.h @@ -0,0 +1,69 @@ +/* +* 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 |