forked from 0ad/0ad
85 lines
2.2 KiB
C++
85 lines
2.2 KiB
C++
#ifndef INCLUDED_ALIGNMENT
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#define INCLUDED_ALIGNMENT
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#include "lib/sysdep/compiler.h" // MSC_VERSION
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#include "lib/sysdep/arch.h" // ARCH_AMD64
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template<typename T>
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inline bool IsAligned(T t, uintptr_t multiple)
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{
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return (uintptr_t(t) % multiple) == 0;
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}
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template<size_t multiple>
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inline size_t Align(size_t n)
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{
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cassert_dependent(multiple != 0 && ((multiple & (multiple-1)) == 0)); // is power of 2
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return (n + multiple-1) & ~(multiple-1);
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}
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// bridge the differences between MSC and GCC alignment definitions.
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// example: ALIGNED(int, 8) myAlignedVariable = 0;
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#if MSC_VERSION
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# define ALIGNED(type, multiple) __declspec(align(multiple)) type
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#elif GCC_VERSION
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# define ALIGNED(type, multiple) type __attribute__((aligned(multiple)))
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#else
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# define ALIGNED(type, multiple) type
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#endif
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//
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// SIMD vector
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//
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static const size_t vectorSize = 16;
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#define VECTOR_ALIGNED(type) ALIGNED(type, 16) // ALIGNED() requires a literal; keep in sync with vectorSize
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#define ASSERT_VECTOR_MULTIPLE(size)\
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ASSERT(IsAligned(size, vectorSize))
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#define ASSERT_VECTOR_ALIGNED(pointer)\
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ASSERT_VECTOR_MULTIPLE(pointer);\
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ASSUME_ALIGNED(pointer, vectorSize)
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//
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// CPU cache
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//
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static const size_t cacheLineSize = 64; // (L2)
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#define CACHE_ALIGNED(type) ALIGNED(type, 64) // ALIGNED() requires a literal; keep in sync with cacheLineSize
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//
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// MMU pages
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//
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static const size_t pageSize = 0x1000; // 4 KB
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static const size_t largePageSize = 0x200000; // 2 MB
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//
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// misc
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//
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static const size_t allocationAlignment = 16;
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static const size_t KiB = size_t(1) << 10;
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static const size_t MiB = size_t(1) << 20;
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static const size_t GiB = size_t(1) << 30;
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// waio opens files with FILE_FLAG_NO_BUFFERING, so Windows requires
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// file offsets / buffers and sizes to be sector-aligned. querying the
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// actual sector size via GetDiskFreeSpace is inconvenient and slow.
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// we always request large blocks anyway, so just check whether inputs
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// are aligned to a `maximum' sector size. this catches common mistakes
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// before they cause scary "IO failed" errors. if the value turns out
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// to be too low, the Windows APIs will still complain.
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static const uintptr_t maxSectorSize = 0x1000;
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#endif // #ifndef INCLUDED_ALIGNMENT
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