1 files changed, 45 insertions, 0 deletions
diff --git a/vpx_ports/mem.h b/vpx_ports/mem.h
new file mode 100644
index 000000000..10942f1e2
--- /dev/null
+++ b/vpx_ports/mem.h
@@ -0,0 +1,45 @@
+/*
+ *  Copyright (c) 2010 The VP8 project authors. All Rights Reserved.
+ *
+ *  Use of this source code is governed by a BSD-style license and patent
+ *  grant that can be found in the LICENSE file in the root of the source
+ *  tree. All contributing project authors may be found in the AUTHORS
+ *  file in the root of the source tree.
+ */
+
+
+#ifndef VPX_PORTS_MEM_H
+#define VPX_PORTS_MEM_H
+#include "vpx_config.h"
+#include "vpx_integer.h"
+
+#if defined(__GNUC__) && __GNUC__
+#define DECLARE_ALIGNED(n,typ,val)  typ val __attribute__ ((aligned (n)))
+#elif defined(_MSC_VER)
+#define DECLARE_ALIGNED(n,typ,val)  __declspec(align(n)) typ val
+#else
+#warning No alignment directives known for this compiler.
+#define DECLARE_ALIGNED(n,typ,val)  typ val
+#endif
+#endif
+
+
+/* Declare an aligned array on the stack, for situations where the stack
+ * pointer may not have the alignment we expect. Creates an array with a
+ * modified name, then defines val to be a pointer, and aligns that pointer
+ * within the array.
+ */
+#define DECLARE_ALIGNED_ARRAY(a,typ,val,n)\
+typ val##_[(n)+(a)/sizeof(typ)+1];\
+typ *val = (typ*)((((intptr_t)val##_)+(a)-1)&((intptr_t)-(a)))
+
+
+/* Indicates that the usage of the specified variable has been audited to assure
+ * that it's safe to use uninitialized. Silences 'may be used uninitialized'
+ * warnings on gcc.
+ */
+#if defined(__GNUC__) && __GNUC__
+#define UNINITIALIZED_IS_SAFE(x) x=x
+#else
+#define UNINITIALIZED_IS_SAFE(x) x
+#endif