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 // VPX_PORTS_MEM_H_ 48