/* Copyright (c) 2015 Wildfire Games * * Permission is hereby granted, free of charge, to any person obtaining * a copy of this software and associated documentation files (the * "Software"), to deal in the Software without restriction, including * without limitation the rights to use, copy, modify, merge, publish, * distribute, sublicense, and/or sell copies of the Software, and to * permit persons to whom the Software is furnished to do so, subject to * the following conditions: * * The above copyright notice and this permission notice shall be included * in all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY * CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, * TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE * SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. */ #ifndef INCLUDED_ALIGNMENT #define INCLUDED_ALIGNMENT #include "lib/sysdep/compiler.h" // MSC_VERSION #include "lib/sysdep/arch.h" // ARCH_AMD64 template inline bool IsAligned(T t, uintptr_t multiple) { return (uintptr_t(t) % multiple) == 0; } template inline size_t Align(size_t n) { cassert(multiple != 0 && ((multiple & (multiple-1)) == 0)); // is power of 2 return (n + multiple-1) & ~(multiple-1); } // bridge the differences between MSC and GCC alignment definitions. // example: ALIGNED(int, 8) myAlignedVariable = 0; #if MSC_VERSION # define ALIGNED(type, multiple) __declspec(align(multiple)) type #elif GCC_VERSION # define ALIGNED(type, multiple) type __attribute__((aligned(multiple))) #else # define ALIGNED(type, multiple) type #endif // // SIMD vector // static const size_t vectorSize = 16; #define VECTOR_ALIGNED(type) ALIGNED(type, 16) // ALIGNED() requires a literal; keep in sync with vectorSize #define ASSERT_VECTOR_MULTIPLE(size)\ ASSERT(IsAligned(size, vectorSize)) #define ASSERT_VECTOR_ALIGNED(pointer)\ ASSERT_VECTOR_MULTIPLE(pointer);\ ASSUME_ALIGNED(pointer, vectorSize) // // CPU cache // static const size_t cacheLineSize = 64; // (L2) #define CACHE_ALIGNED(type) ALIGNED(type, 64) // ALIGNED() requires a literal; keep in sync with cacheLineSize // // MMU pages // static const size_t pageSize = 0x1000; // 4 KB static const size_t largePageSize = 0x200000; // 2 MB // // misc // static const size_t allocationAlignment = 16; static const size_t KiB = size_t(1) << 10; static const size_t MiB = size_t(1) << 20; static const size_t GiB = size_t(1) << 30; // waio opens files with FILE_FLAG_NO_BUFFERING, so Windows requires // file offsets / buffers and sizes to be sector-aligned. querying the // actual sector size via GetDiskFreeSpace is inconvenient and slow. // we always request large blocks anyway, so just check whether inputs // are aligned to a `maximum' sector size. this catches common mistakes // before they cause scary "IO failed" errors. if the value turns out // to be too low, the Windows APIs will still complain. static const uintptr_t maxSectorSize = 0x1000; #endif // #ifndef INCLUDED_ALIGNMENT