* include Macros.h much earlier: since it takes care of the alignment platform detection, it is needed before we do the vectorization stuff in Eigen/Core !!

* kill EIGEN_DONT_ALIGN_HEAP option (one should use EIGEN_DONT_ALIGN)
* rename EIGEN_DONT_ALIGN_STACK to EIGEN_DONT_ALIGN_STATICALLY. hope it's a better name.

Eigen/src/Core/util/XprHelper.h

@@ -88,21 +88,38 @@ class ei_compute_matrix_flags
     enum {
       row_major_bit = Options&RowMajor ? RowMajorBit : 0,
       is_dynamic_size_storage = MaxRows==Dynamic || MaxCols==Dynamic,
-#if EIGEN_ALIGN_STACK
+#if EIGEN_ALIGN_STATICALLY
       is_fixed_size_aligned
         = (!is_dynamic_size_storage) && (((MaxCols*MaxRows) % ei_packet_traits<Scalar>::size) == 0),
 #else
       is_fixed_size_aligned = 0,
 #endif
-#if EIGEN_ALIGN_HEAP
+#if EIGEN_ALIGN
       is_dynamic_size_aligned = is_dynamic_size_storage,
 #else
       is_dynamic_size_aligned = 0,
 #endif
 
-      aligned_bit = (((Options&DontAlign)==0)
-        && (is_dynamic_size_aligned || is_fixed_size_aligned))
-        ? AlignedBit : 0,
+      aligned_bit =
+      (
+        ((Options&DontAlign)==0)
+        && (
+#if EIGEN_ALIGN_STATICALLY
+             ((!is_dynamic_size_storage) && (((MaxCols*MaxRows) % ei_packet_traits<Scalar>::size) == 0))
+#else
+             0
+#endif
+
+          ||
+
+#if EIGEN_ALIGN
+             is_dynamic_size_storage
+#else
+             0
+#endif
+
+          )
+      ) ? AlignedBit : 0,
       packet_access_bit = ei_packet_traits<Scalar>::size > 1 && aligned_bit ? PacketAccessBit : 0
     };