Added macro to assign a restrict pointer to an array and inform compiler that is aligned.

src/align.h

@@ -58,6 +58,30 @@
 #define swift_align_information(array, alignment) ;
 #endif
 
+/**
+ * @brief Macro to create a restrict pointer to an array and tell the compiler that the given array has the specified
+ * alignment. 
+ *
+ * Note that this turns into a no-op but gives information to the compiler.
+ *
+ * @param array The array.
+ * @param ptr Pointer to array
+ * @param type Type of array
+ * @param alignment The alignment in bytes of the array.
+ */
+#if defined(__ICC)
+#define swift_align_and_restrict_information(array, ptr, type, alignment) \
+  type *restrict array = ptr;                                \
+  __assume_aligned(array, alignment);                        
+#elif defined(__GNUC__)
+#define swift_align_and_restrict_information(array, ptr, type, alignment) \
+  type *restrict array = ptr;                                \
+  array = __builtin_assume_aligned(array, alignment);
+#else
+#define swift_align_and_restrict_information(array, ptr, type, alignment) \
+  type *restrict array = ptr;
+#endif
+
 /**
  * @brief Macro to tell the compiler that a given number is 0 modulo a given
  * size.