2 * Copyright (c) 2010 The WebM project authors. All Rights Reserved.
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.
12 #ifndef VPX_PORTS_MEM_H
13 #define VPX_PORTS_MEM_H
14 #include "vpx_config.h"
15 #include "vpx/vpx_integer.h"
17 #if defined(__GNUC__) && __GNUC__
18 #define DECLARE_ALIGNED(n,typ,val) typ val __attribute__ ((aligned (n)))
19 #elif defined(_MSC_VER)
20 #define DECLARE_ALIGNED(n,typ,val) __declspec(align(n)) typ val
22 #warning No alignment directives known for this compiler.
23 #define DECLARE_ALIGNED(n,typ,val) typ val
28 /* Declare an aligned array on the stack, for situations where the stack
29 * pointer may not have the alignment we expect. Creates an array with a
30 * modified name, then defines val to be a pointer, and aligns that pointer
33 #define DECLARE_ALIGNED_ARRAY(a,typ,val,n)\
34 typ val##_[(n)+(a)/sizeof(typ)+1];\
35 typ *val = (typ*)((((intptr_t)val##_)+(a)-1)&((intptr_t)-(a)))
38 /* Indicates that the usage of the specified variable has been audited to assure
39 * that it's safe to use uninitialized. Silences 'may be used uninitialized'
42 #if defined(__GNUC__) && __GNUC__
43 #define UNINITIALIZED_IS_SAFE(x) x=x
45 #define UNINITIALIZED_IS_SAFE(x) x