From 6c9245aff4a2f47e4effc91c2ba484932abfef39 Mon Sep 17 00:00:00 2001
From: jwellbelove <github@wellbelove.co.uk>
Date: Wed, 19 Nov 2014 18:30:15 +0000
Subject: [PATCH] Align a variable to a compile time value

---
 aligned_variable.h | 195 +++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 195 insertions(+)
 create mode 100644 aligned_variable.h

diff --git a/aligned_variable.h b/aligned_variable.h
new file mode 100644
index 00000000..4328441b
--- /dev/null
+++ b/aligned_variable.h
@@ -0,0 +1,195 @@
+///\file
+
+/******************************************************************************
+The MIT License(MIT)
+
+Embedded Template Library.
+
+Copyright(c) 2014 jwellbelove
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files(the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and / or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions :
+
+The above copyright notice and this permission notice shall be included in all
+copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
+SOFTWARE.
+******************************************************************************/
+
+#ifndef __ETL_ALIGNED_VARIABLE__
+#define __ETL_ALIGNED_VARIABLE__
+
+///\defgroup aligned_variable aligned_variable
+/// Creates a variable of the specified type at the specified alignment.
+/// \ingroup utilities
+
+namespace etl
+{
+  template <typename T, const size_t ALIGNMENT>
+  struct aligned_variable;
+
+#if defined(COMPILER_MICROSOFT)
+  /// Align 1
+  template <typename T>
+  struct aligned_variable<T, 1>
+  {
+    __declspec(align(1)) T value;
+  };
+
+  /// Align 2
+  template <typename T>
+  struct aligned_variable<T, 2>
+  {
+    __declspec(align(2)) T value;
+  };
+
+  /// Align 4
+  template <typename T>
+  struct aligned_variable<T, 4>
+  {
+    __declspec(align(4)) T value;
+  };
+
+  /// Align 8
+  template <typename T>
+  struct aligned_variable<T, 8>
+  {
+    __declspec(align(8)) T value;
+  };
+
+  /// Align 16
+  template <typename T>
+  struct aligned_variable<T, 16>
+  {
+    __declspec(align(16)) T value;
+  };
+#endif
+
+#if defined(COMPILER_GCC)
+  /// Align 1
+  template <typename T>
+  struct aligned_variable<T, 1>
+  {
+    T value __attribute__((aligned(1)));
+  };
+
+  /// Align 2
+  template <typename T>
+  struct aligned_variable<T, 2>
+  {
+    T value __attribute__((aligned(2)));
+  };
+
+  /// Align 4
+  template <typename T>
+  struct aligned_variable<T, 4>
+  {
+    T value __attribute__((aligned(4)));
+  };
+
+  /// Align 8
+  template <typename T>
+  struct aligned_variable<T, 8>
+  {
+    T value __attribute__((aligned(8)));
+  };
+  
+  /// Align 16
+  template <typename T>
+  struct aligned_variable<T, 16>
+  {
+    T value __attribute__((aligned(16)));
+  };
+#endif
+
+#if defined(COMPILER_KEIL_ARM)
+  /// Align 1
+  template <typename T>
+  struct aligned_variable<T, 1>
+  {
+    __align(1) T value;
+  };
+
+  /// Align 2
+  template <typename T>
+  struct aligned_variable<T, 2>
+  {
+    __align(2) T value;
+  };
+
+  /// Align 4
+  template <typename T>
+  struct aligned_variable<T, 4>
+  {
+    __align(4) T value;
+};
+
+  /// Align 8
+  template <typename T>
+  struct aligned_variable<T, 8>
+  {
+    __align(8) T value;
+  };
+
+  /// Align 16
+  template <typename T>
+  struct aligned_variable<T, 16>
+  {
+    __align(16) T value;
+  };
+#endif
+
+#if defined (COMPILER_IAR_ARM)
+  /// Align 1
+  template <typename T>
+  struct aligned_variable<T, 1>
+  {
+#pragma data_alignment=1
+    T value;
+  };
+
+  /// Align 2
+  template <typename T>
+  struct aligned_variable<T, 2>
+  {
+#pragma data_alignment=2 
+    T value;
+  };
+
+  /// Align 4
+  template <typename T>
+  struct aligned_variable<T, 4>
+  {
+#pragma data_alignment=4 
+    T value;
+  };
+
+  /// Align 8
+  template <typename T>
+  struct aligned_variable<T, 8>
+  {
+#pragma data_alignment=8
+    T value;
+  };
+
+  /// Align 16
+  template <typename T>
+  struct aligned_variable<T, 16>
+  {
+#pragma data_alignment=16
+    T value;
+  };
+#endif
+}
+
+#endif
\ No newline at end of file