1/*
2 *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
3 *
4 *  Use of this source code is governed by a BSD-style license
5 *  that can be found in the LICENSE file in the root of the source
6 *  tree. An additional intellectual property rights grant can be found
7 *  in the file PATENTS.  All contributing project authors may
8 *  be found in the AUTHORS file in the root of the source tree.
9 */
10
11
12#ifndef VPX_PORTS_MEM_H
13#define VPX_PORTS_MEM_H
14
15#include "vpx_config.h"
16#include "vpx/vpx_integer.h"
17
18#if (defined(__GNUC__) && __GNUC__) || defined(__SUNPRO_C)
19#define DECLARE_ALIGNED(n,typ,val)  typ val __attribute__ ((aligned (n)))
20#elif defined(_MSC_VER)
21#define DECLARE_ALIGNED(n,typ,val)  __declspec(align(n)) typ val
22#else
23#warning No alignment directives known for this compiler.
24#define DECLARE_ALIGNED(n,typ,val)  typ val
25#endif
26#endif
27
28
29/* Declare an aligned array on the stack, for situations where the stack
30 * pointer may not have the alignment we expect. Creates an array with a
31 * modified name, then defines val to be a pointer, and aligns that pointer
32 * within the array.
33 */
34#define DECLARE_ALIGNED_ARRAY(a,typ,val,n)\
35  typ val##_[(n)+(a)/sizeof(typ)+1];\
36  typ *val = (typ*)((((intptr_t)val##_)+(a)-1)&((intptr_t)-(a)))
37
38
39/* Indicates that the usage of the specified variable has been audited to assure
40 * that it's safe to use uninitialized. Silences 'may be used uninitialized'
41 * warnings on gcc.
42 */
43#if defined(__GNUC__) && __GNUC__
44#define UNINITIALIZED_IS_SAFE(x) x=x
45#else
46#define UNINITIALIZED_IS_SAFE(x) x
47#endif
48