vpx_ports/mem.h

   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
  27 /* Indicates that the usage of the specified variable has been audited to assure
  28  * that it's safe to use uninitialized. Silences 'may be used uninitialized'
  29  * warnings on gcc.
  30  */
  31 #if defined(__GNUC__) && __GNUC__
  32 #define UNINITIALIZED_IS_SAFE(x) x=x
  33 #else
  34 #define UNINITIALIZED_IS_SAFE(x) x
  35 #endif
  36
  37 #if HAVE_NEON && defined(_MSC_VER)
  38 #define __builtin_prefetch(x)
  39 #endif
  40
  41 /* Shift down with rounding */
  42 #define ROUND_POWER_OF_TWO(value, n) \
  43     (((value) + (1 << ((n) - 1))) >> (n))
  44
  45 #define ALIGN_POWER_OF_TWO(value, n) \
  46     (((value) + ((1 << (n)) - 1)) & ~((1 << (n)) - 1))
  47
  48 #if CONFIG_VP9_HIGHBITDEPTH
  49 #define CONVERT_TO_SHORTPTR(x) ((uint16_t*)(((uintptr_t)x) << 1))
  50 #define CONVERT_TO_BYTEPTR(x) ((uint8_t*)(((uintptr_t)x) >> 1))
  51 #endif  // CONFIG_VP9_HIGHBITDEPTH
  52
  53 #endif  // VPX_PORTS_MEM_H_