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Add a EIGEN_DEFAULT_ALIGN_BYTES macro defining default alignment for alloca and aligned_malloc.

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It is defined as the max of EIGEN_IDEAL_MAX_ALIGN_BYTES and EIGEN_MAX_ALIGN_BYTES
This commit is contained in:
Gael Guennebaud 2015-08-06 13:56:53 +02:00
parent 7e0d7a76b8
commit d4f5efc51a
2 changed files with 30 additions and 19 deletions
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6
Eigen/src/Core/util/Macros.h
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@ -668,6 +668,12 @@ namespace Eigen {
#define EIGEN_MAX_ALIGN_BYTES EIGEN_IDEAL_MAX_ALIGN_BYTES
#endif
#if EIGEN_IDEAL_MAX_ALIGN_BYTES > EIGEN_MAX_ALIGN_BYTES
#define EIGEN_DEFAULT_ALIGN_BYTES EIGEN_IDEAL_MAX_ALIGN_BYTES
#else
#define EIGEN_DEFAULT_ALIGN_BYTES EIGEN_MAX_ALIGN_BYTES
#endif
//----------------------------------------------------------------------

39
Eigen/src/Core/util/Memory.h
View File

@ -32,7 +32,7 @@
// page 114, "[The] LP64 model [...] is used by all 64-bit UNIX ports" so it's indeed
// quite safe, at least within the context of glibc, to equate 64-bit with LP64.
#if defined(__GLIBC__) && ((__GLIBC__>=2 && __GLIBC_MINOR__ >= 8) || __GLIBC__>2) \
&& defined(__LP64__) && ! defined( __SANITIZE_ADDRESS__ ) && (EIGEN_MAX_ALIGN_BYTES == 16)
&& defined(__LP64__) && ! defined( __SANITIZE_ADDRESS__ ) && (EIGEN_DEFAULT_ALIGN_BYTES == 16)
#define EIGEN_GLIBC_MALLOC_ALREADY_ALIGNED 1
#else
#define EIGEN_GLIBC_MALLOC_ALREADY_ALIGNED 0
@ -42,14 +42,14 @@
// See http://svn.freebsd.org/viewvc/base/stable/6/lib/libc/stdlib/malloc.c?view=markup
// FreeBSD 7 seems to have 16-byte aligned malloc except on ARM and MIPS architectures
// See http://svn.freebsd.org/viewvc/base/stable/7/lib/libc/stdlib/malloc.c?view=markup
#if defined(__FreeBSD__) && !(EIGEN_ARCH_ARM || EIGEN_ARCH_MIPS) && (EIGEN_MAX_ALIGN_BYTES == 16)
#if defined(__FreeBSD__) && !(EIGEN_ARCH_ARM || EIGEN_ARCH_MIPS) && (EIGEN_DEFAULT_ALIGN_BYTES == 16)
#define EIGEN_FREEBSD_MALLOC_ALREADY_ALIGNED 1
#else
#define EIGEN_FREEBSD_MALLOC_ALREADY_ALIGNED 0
#endif
#if (EIGEN_OS_MAC && (EIGEN_MAX_ALIGN_BYTES == 16)) \
|| (EIGEN_OS_WIN64 && (EIGEN_MAX_ALIGN_BYTES == 16)) \
#if (EIGEN_OS_MAC && (EIGEN_DEFAULT_ALIGN_BYTES == 16)) \
|| (EIGEN_OS_WIN64 && (EIGEN_DEFAULT_ALIGN_BYTES == 16)) \
|| EIGEN_GLIBC_MALLOC_ALREADY_ALIGNED \
|| EIGEN_FREEBSD_MALLOC_ALREADY_ALIGNED
#define EIGEN_MALLOC_ALREADY_ALIGNED 1
@ -107,9 +107,9 @@ inline void throw_std_bad_alloc()
*/
inline void* handmade_aligned_malloc(std::size_t size)
{
void *original = std::malloc(size+EIGEN_MAX_ALIGN_BYTES);
void *original = std::malloc(size+EIGEN_DEFAULT_ALIGN_BYTES);
if (original == 0) return 0;
void *aligned = reinterpret_cast<void*>((reinterpret_cast<std::size_t>(original) & ~(std::size_t(EIGEN_MAX_ALIGN_BYTES-1))) + EIGEN_MAX_ALIGN_BYTES);
void *aligned = reinterpret_cast<void*>((reinterpret_cast<std::size_t>(original) & ~(std::size_t(EIGEN_DEFAULT_ALIGN_BYTES-1))) + EIGEN_DEFAULT_ALIGN_BYTES);
*(reinterpret_cast<void**>(aligned) - 1) = original;
return aligned;
}
@ -130,9 +130,9 @@ inline void* handmade_aligned_realloc(void* ptr, std::size_t size, std::size_t =
if (ptr == 0) return handmade_aligned_malloc(size);
void *original = *(reinterpret_cast<void**>(ptr) - 1);
std::ptrdiff_t previous_offset = static_cast<char *>(ptr)-static_cast<char *>(original);
original = std::realloc(original,size+EIGEN_MAX_ALIGN_BYTES);
original = std::realloc(original,size+EIGEN_DEFAULT_ALIGN_BYTES);
if (original == 0) return 0;
void *aligned = reinterpret_cast<void*>((reinterpret_cast<std::size_t>(original) & ~(std::size_t(EIGEN_MAX_ALIGN_BYTES-1))) + EIGEN_MAX_ALIGN_BYTES);
void *aligned = reinterpret_cast<void*>((reinterpret_cast<std::size_t>(original) & ~(std::size_t(EIGEN_DEFAULT_ALIGN_BYTES-1))) + EIGEN_DEFAULT_ALIGN_BYTES);
void *previous_aligned = static_cast<char *>(original)+previous_offset;
if(aligned!=previous_aligned)
std::memmove(aligned, previous_aligned, size);
@ -218,16 +218,16 @@ EIGEN_DEVICE_FUNC inline void* aligned_malloc(size_t size)
check_that_malloc_is_allowed();
void *result;
#if EIGEN_MAX_ALIGN_BYTES==0
#if EIGEN_DEFAULT_ALIGN_BYTES==0
result = std::malloc(size);
#elif EIGEN_MALLOC_ALREADY_ALIGNED
result = std::malloc(size);
#elif EIGEN_HAS_POSIX_MEMALIGN
if(posix_memalign(&result, EIGEN_MAX_ALIGN_BYTES, size)) result = 0;
if(posix_memalign(&result, EIGEN_DEFAULT_ALIGN_BYTES, size)) result = 0;
#elif EIGEN_HAS_MM_MALLOC
result = _mm_malloc(size, EIGEN_MAX_ALIGN_BYTES);
result = _mm_malloc(size, EIGEN_DEFAULT_ALIGN_BYTES);
#elif EIGEN_OS_WIN_STRICT
result = _aligned_malloc(size, EIGEN_MAX_ALIGN_BYTES);
result = _aligned_malloc(size, EIGEN_DEFAULT_ALIGN_BYTES);
#else
result = handmade_aligned_malloc(size);
#endif
@ -241,7 +241,7 @@ EIGEN_DEVICE_FUNC inline void* aligned_malloc(size_t size)
/** \internal Frees memory allocated with aligned_malloc. */
EIGEN_DEVICE_FUNC inline void aligned_free(void *ptr)
{
#if EIGEN_MAX_ALIGN_BYTES==0
#if EIGEN_DEFAULT_ALIGN_BYTES==0
std::free(ptr);
#elif EIGEN_MALLOC_ALREADY_ALIGNED
std::free(ptr);
@ -266,7 +266,7 @@ inline void* aligned_realloc(void *ptr, size_t new_size, size_t old_size)
EIGEN_UNUSED_VARIABLE(old_size);
void *result;
#if EIGEN_MAX_ALIGN_BYTES==0
#if EIGEN_DEFAULT_ALIGN_BYTES==0
result = std::realloc(ptr,new_size);
#elif EIGEN_MALLOC_ALREADY_ALIGNED
result = std::realloc(ptr,new_size);
@ -277,12 +277,12 @@ inline void* aligned_realloc(void *ptr, size_t new_size, size_t old_size)
// implements _mm_malloc/_mm_free based on the corresponding _aligned_
// functions. This may not always be the case and we just try to be safe.
#if EIGEN_OS_WIN_STRICT && defined(_mm_free)
result = _aligned_realloc(ptr,new_size,EIGEN_MAX_ALIGN_BYTES);
result = _aligned_realloc(ptr,new_size,EIGEN_DEFAULT_ALIGN_BYTES);
#else
result = generic_aligned_realloc(ptr,new_size,old_size);
#endif
#elif EIGEN_OS_WIN_STRICT
result = _aligned_realloc(ptr,new_size,EIGEN_MAX_ALIGN_BYTES);
result = _aligned_realloc(ptr,new_size,EIGEN_DEFAULT_ALIGN_BYTES);
#else
result = handmade_aligned_realloc(ptr,new_size,old_size);
#endif
@ -689,9 +689,14 @@ 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.
#define EIGEN_ALIGNED_ALLOCA(SIZE) reinterpret_cast<void*>((reinterpret_cast<size_t>(EIGEN_ALLOCA(SIZE+EIGEN_MAX_ALIGN_BYTES-1)) + EIGEN_MAX_ALIGN_BYTES-1) & ~(size_t(EIGEN_MAX_ALIGN_BYTES-1)))
#define EIGEN_ALIGNED_ALLOCA(SIZE) reinterpret_cast<void*>((reinterpret_cast<std::size_t>(EIGEN_ALLOCA(SIZE+EIGEN_DEFAULT_ALIGN_BYTES-1)) + EIGEN_DEFAULT_ALIGN_BYTES-1) & ~(std::size_t(EIGEN_DEFAULT_ALIGN_BYTES-1)))
#else
#define EIGEN_ALIGNED_ALLOCA(SIZE) EIGEN_ALLOCA(SIZE)
#endif
#define ei_declare_aligned_stack_constructed_variable(TYPE,NAME,SIZE,BUFFER) \
Eigen::internal::check_size_for_overflow<TYPE>(SIZE); \