michael@0: /*
michael@0:  *  Copyright (c) 2010 The WebM project authors. All Rights Reserved.
michael@0:  *
michael@0:  *  Use of this source code is governed by a BSD-style license
michael@0:  *  that can be found in the LICENSE file in the root of the source
michael@0:  *  tree. An additional intellectual property rights grant can be found
michael@0:  *  in the file PATENTS.  All contributing project authors may
michael@0:  *  be found in the AUTHORS file in the root of the source tree.
michael@0:  */
michael@0: 
michael@0: 
michael@0: #ifndef VPX_PORTS_MEM_H
michael@0: #define VPX_PORTS_MEM_H
michael@0: 
michael@0: #include "vpx_config.h"
michael@0: #include "vpx/vpx_integer.h"
michael@0: 
michael@0: #if (defined(__GNUC__) && __GNUC__) || defined(__SUNPRO_C)
michael@0: #define DECLARE_ALIGNED(n,typ,val)  typ val __attribute__ ((aligned (n)))
michael@0: #elif defined(_MSC_VER)
michael@0: #define DECLARE_ALIGNED(n,typ,val)  __declspec(align(n)) typ val
michael@0: #else
michael@0: #warning No alignment directives known for this compiler.
michael@0: #define DECLARE_ALIGNED(n,typ,val)  typ val
michael@0: #endif
michael@0: #endif
michael@0: 
michael@0: 
michael@0: /* Declare an aligned array on the stack, for situations where the stack
michael@0:  * pointer may not have the alignment we expect. Creates an array with a
michael@0:  * modified name, then defines val to be a pointer, and aligns that pointer
michael@0:  * within the array.
michael@0:  */
michael@0: #define DECLARE_ALIGNED_ARRAY(a,typ,val,n)\
michael@0:   typ val##_[(n)+(a)/sizeof(typ)+1];\
michael@0:   typ *val = (typ*)((((intptr_t)val##_)+(a)-1)&((intptr_t)-(a)))
michael@0: 
michael@0: 
michael@0: /* Indicates that the usage of the specified variable has been audited to assure
michael@0:  * that it's safe to use uninitialized. Silences 'may be used uninitialized'
michael@0:  * warnings on gcc.
michael@0:  */
michael@0: #if defined(__GNUC__) && __GNUC__
michael@0: #define UNINITIALIZED_IS_SAFE(x) x=x
michael@0: #else
michael@0: #define UNINITIALIZED_IS_SAFE(x) x
michael@0: #endif