diff options
Diffstat (limited to 'Eigen/src/Core/util/Memory.h')
| -rw-r--r-- | Eigen/src/Core/util/Memory.h | 61 |
1 files changed, 48 insertions, 13 deletions
diff --git a/Eigen/src/Core/util/Memory.h b/Eigen/src/Core/util/Memory.h index c634d7ea0..6b8e307c8 100644 --- a/Eigen/src/Core/util/Memory.h +++ b/Eigen/src/Core/util/Memory.h @@ -63,7 +63,7 @@ namespace Eigen { namespace internal { -EIGEN_DEVICE_FUNC +EIGEN_DEVICE_FUNC inline void throw_std_bad_alloc() { #ifdef EIGEN_EXCEPTIONS @@ -74,6 +74,41 @@ inline void throw_std_bad_alloc() #endif } +EIGEN_DEVICE_FUNC +inline void fast_memcpy(void* dst, const void* src, size_t size) { +#if defined(__CUDA__) || defined(__ANDROID__) + ::memcpy(dst, src, size); +#else + switch(size) { + // Most compilers will generate inline code for fixed sizes, + // which is significantly faster for small copies. + case 1: memcpy(dst, src, 1); break; + case 2: memcpy(dst, src, 2); break; + case 3: memcpy(dst, src, 3); break; + case 4: memcpy(dst, src, 4); break; + case 5: memcpy(dst, src, 5); break; + case 6: memcpy(dst, src, 6); break; + case 7: memcpy(dst, src, 7); break; + case 8: memcpy(dst, src, 8); break; + case 9: memcpy(dst, src, 9); break; + case 10: memcpy(dst, src, 10); break; + case 11: memcpy(dst, src, 11); break; + case 12: memcpy(dst, src, 12); break; + case 13: memcpy(dst, src, 13); break; + case 14: memcpy(dst, src, 14); break; + case 15: memcpy(dst, src, 15); break; + case 16: memcpy(dst, src, 16); break; +#ifdef EIGEN_OS_LINUX + // On Linux, memmove appears to be faster than memcpy for + // large sizes, strangely enough. + default: memmove(dst, src, size); break; +#else + default: memcpy(dst, src, size); break; +#endif + } +#endif +} + /***************************************************************************** *** Implementation of handmade aligned functions *** *****************************************************************************/ @@ -114,7 +149,7 @@ inline void* handmade_aligned_realloc(void* ptr, std::size_t size, std::size_t = void *previous_aligned = static_cast<char *>(original)+previous_offset; if(aligned!=previous_aligned) std::memmove(aligned, previous_aligned, size); - + *(reinterpret_cast<void**>(aligned) - 1) = original; return aligned; } @@ -142,7 +177,7 @@ EIGEN_DEVICE_FUNC inline void check_that_malloc_is_allowed() { eigen_assert(is_malloc_allowed() && "heap allocation is forbidden (EIGEN_RUNTIME_NO_MALLOC is defined and g_is_malloc_allowed is false)"); } -#else +#else EIGEN_DEVICE_FUNC inline void check_that_malloc_is_allowed() {} #endif @@ -471,8 +506,8 @@ EIGEN_DEVICE_FUNC inline Index first_default_aligned(const Scalar* array, Index } /** \internal Returns the smallest integer multiple of \a base and greater or equal to \a size - */ -template<typename Index> + */ +template<typename Index> inline Index first_multiple(Index size, Index base) { return ((size+base-1)/base)*base; @@ -502,7 +537,7 @@ template<typename T> struct smart_copy_helper<T,false> { { std::copy(start, end, target); } }; -// intelligent memmove. falls back to std::memmove for POD types, uses std::copy otherwise. +// intelligent memmove. falls back to std::memmove for POD types, uses std::copy otherwise. template<typename T, bool UseMemmove> struct smart_memmove_helper; template<typename T> void smart_memmove(const T* start, const T* end, T* target) @@ -522,15 +557,15 @@ template<typename T> struct smart_memmove_helper<T,true> { template<typename T> struct smart_memmove_helper<T,false> { static inline void run(const T* start, const T* end, T* target) - { + { if (UIntPtr(target) < UIntPtr(start)) { std::copy(start, end, target); } - else + else { std::ptrdiff_t count = (std::ptrdiff_t(end)-std::ptrdiff_t(start)) / sizeof(T); - std::copy_backward(start, end, target + count); + std::copy_backward(start, end, target + count); } } }; @@ -603,7 +638,7 @@ template<typename T> void swap(scoped_array<T> &a,scoped_array<T> &b) { std::swap(a.ptr(),b.ptr()); } - + } // end namespace internal /** \internal @@ -622,7 +657,7 @@ template<typename T> void swap(scoped_array<T> &a,scoped_array<T> &b) * The underlying stack allocation function can controlled with the EIGEN_ALLOCA preprocessor token. */ #ifdef EIGEN_ALLOCA - + #if EIGEN_DEFAULT_ALIGN_BYTES>0 // We always manually re-align the result of EIGEN_ALLOCA. // If alloca is already aligned, the compiler should be smart enough to optimize away the re-alignment. @@ -645,7 +680,7 @@ template<typename T> void swap(scoped_array<T> &a,scoped_array<T> &b) Eigen::internal::check_size_for_overflow<TYPE>(SIZE); \ TYPE* NAME = (BUFFER)!=0 ? BUFFER : reinterpret_cast<TYPE*>(Eigen::internal::aligned_malloc(sizeof(TYPE)*SIZE)); \ Eigen::internal::aligned_stack_memory_handler<TYPE> EIGEN_CAT(NAME,_stack_memory_destructor)((BUFFER)==0 ? NAME : 0,SIZE,true) - + #endif @@ -701,7 +736,7 @@ template<typename T> void swap(scoped_array<T> &a,scoped_array<T> &b) * Example: * \code * // Matrix4f requires 16 bytes alignment: -* std::map< int, Matrix4f, std::less<int>, +* std::map< int, Matrix4f, std::less<int>, * aligned_allocator<std::pair<const int, Matrix4f> > > my_map_mat4; * // Vector3f does not require 16 bytes alignment, no need to use Eigen's allocator: * std::map< int, Vector3f > my_map_vec3; |