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Added initial NEON support, most tests pass however we had to use some hackish workarounds

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as gcc on ARM (both CodeSourcery 4.4.1 used and experimental 4.5) fail to
ensure proper alignment with __attribute__((aligned(16))). This has to be
fixed upstream to remove the workarounds.
This commit is contained in:
Konstantinos Margaritis
2010-03-03 11:25:41 -06:00
parent 45d19afb18
commit 112c550b4a
12 changed files with 423 additions and 5 deletions
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2
Eigen/src/Core/util/Macros.h
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@@ -39,7 +39,7 @@
// 16 byte alignment is only useful for vectorization. Since it affects the ABI, we need to enable 16 byte alignment on all
// platforms where vectorization might be enabled. In theory we could always enable alignment, but it can be a cause of problems
// on some platforms, so we just disable it in certain common platform (compiler+architecture combinations) to avoid these problems.
#if defined(__GNUC__) && !(defined(__i386__) || defined(__x86_64__) || defined(__powerpc__) || defined(__ppc__) || defined(__ia64__))
#if defined(__GNUC__) && !(defined(__i386__) || defined(__x86_64__) || defined(__powerpc__) || defined(__ppc__) || defined(__ia64__) || defined(__ARM_NEON__))
#define EIGEN_GCC_AND_ARCH_DOESNT_WANT_ALIGNMENT 1
#else
#define EIGEN_GCC_AND_ARCH_DOESNT_WANT_ALIGNMENT 0

2
Eigen/src/Core/util/Memory.h
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@@ -424,7 +424,7 @@ inline static Integer ei_first_aligned(const Scalar* array, Integer size)
* ei_aligned_stack_free(data,float,array.size());
* \endcode
*/
#ifdef __linux__
#if (defined __linux__) && !(defined __ARM_NEON__)
#define ei_aligned_stack_alloc(SIZE) (SIZE<=EIGEN_STACK_ALLOCATION_LIMIT) \
? alloca(SIZE) \
: ei_aligned_malloc(SIZE)

5
Eigen/src/Core/util/XprHelper.h
View File

@@ -88,8 +88,13 @@ class ei_compute_matrix_flags
enum {
row_major_bit = Options&RowMajor ? RowMajorBit : 0,
is_dynamic_size_storage = MaxRows==Dynamic || MaxCols==Dynamic,
#if !defined(__ARM_NEON__)
is_fixed_size_aligned
= (!is_dynamic_size_storage)
#else
// FIXME!!! This is a hack because ARM gcc does not honour __attribute__((aligned(16))) properly
is_fixed_size_aligned = 0
#endif
&& (((MaxCols*MaxRows) % ei_packet_traits<Scalar>::size) == 0),
aligned_bit = (((Options&DontAlign)==0)
&& (is_dynamic_size_storage || is_fixed_size_aligned))