From 175ed636ea3ac5b1b807642421a036f8a9a10f1f Mon Sep 17 00:00:00 2001
From: Gael Guennebaud <g.gael@free.fr>
Date: Wed, 29 Jul 2015 10:22:25 +0200
Subject: bug #973: update macro-level control of alignement by introducing
 user-controllable EIGEN_MAX_ALIGN_BYTES and EIGEN_MAX_STATIC_ALIGN_BYTES
 macros. This changeset also removes EIGEN_ALIGN (replaced by
 EIGEN_MAX_ALIGN_BYTES>0), EIGEN_ALIGN_STATICALLY (replaced by
 EIGEN_MAX_STATIC_ALIGN_BYTES>0), EIGEN_USER_ALIGN*, EIGEN_ALIGN_DEFAULT
 (replaced by EIGEN_ALIGN_MAX).

---
 Eigen/src/Core/DenseStorage.h | 23 +++++++++++------------
 1 file changed, 11 insertions(+), 12 deletions(-)

(limited to 'Eigen/src/Core/DenseStorage.h')

diff --git a/Eigen/src/Core/DenseStorage.h b/Eigen/src/Core/DenseStorage.h
index 5eb434c6d..5edf8a4ee 100644
--- a/Eigen/src/Core/DenseStorage.h
+++ b/Eigen/src/Core/DenseStorage.h
@@ -34,26 +34,25 @@ void check_static_allocation_size()
   #endif
 }
 
-template<typename T, int Size, typename Packet = typename packet_traits<T>::type,
-         bool Match     =  bool((Size%unpacket_traits<Packet>::size)==0),
-         bool TryHalf   =  bool(int(unpacket_traits<Packet>::size) > 1)
-                        && bool(int(unpacket_traits<Packet>::size) > int(unpacket_traits<typename unpacket_traits<Packet>::half>::size)) >
+template<int ArrayBytes, int AlignmentBytes,
+         bool Match     =  bool((ArrayBytes%AlignmentBytes)==0),
+         bool TryHalf   =  bool(AlignmentBytes>EIGEN_MIN_ALIGN_BYTES) >
 struct compute_default_alignment
 {
   enum { value = 0 };
 };
 
-template<typename T, int Size, typename Packet, bool TryHalf>
-struct compute_default_alignment<T, Size, Packet, true, TryHalf> // Match
+template<int ArrayBytes, int AlignmentBytes, bool TryHalf>
+struct compute_default_alignment<ArrayBytes, AlignmentBytes, true, TryHalf> // Match
 {
-  enum { value = sizeof(T) * unpacket_traits<Packet>::size };
+  enum { value = AlignmentBytes };
 };
 
-template<typename T, int Size, typename Packet>
-struct compute_default_alignment<T, Size, Packet, false, true> // Try-half
+template<int ArrayBytes, int AlignmentBytes>
+struct compute_default_alignment<ArrayBytes, AlignmentBytes, false, true> // Try-half
 {
   // current packet too large, try with an half-packet
-  enum { value = compute_default_alignment<T, Size, typename unpacket_traits<Packet>::half>::value };
+  enum { value = compute_default_alignment<ArrayBytes, AlignmentBytes/2>::value };
 };
 
 /** \internal
@@ -62,7 +61,7 @@ struct compute_default_alignment<T, Size, Packet, false, true> // Try-half
   */
 template <typename T, int Size, int MatrixOrArrayOptions,
           int Alignment = (MatrixOrArrayOptions&DontAlign) ? 0
-                        : compute_default_alignment<T,Size>::value >
+                        : compute_default_alignment<Size*sizeof(T), EIGEN_PLAIN_ENUM_MAX(packet_traits<T>::size*sizeof(T), EIGEN_MAX_STATIC_ALIGN_BYTES) >::value >
 struct plain_array
 {
   T array[Size];
@@ -180,7 +179,7 @@ struct plain_array<T, Size, MatrixOrArrayOptions, 64>
 template <typename T, int MatrixOrArrayOptions, int Alignment>
 struct plain_array<T, 0, MatrixOrArrayOptions, Alignment>
 {
-  EIGEN_USER_ALIGN_DEFAULT T array[1];
+  T array[1];
   EIGEN_DEVICE_FUNC plain_array() {}
   EIGEN_DEVICE_FUNC plain_array(constructor_without_unaligned_array_assert) {}
 };
-- 
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