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