vpx_ports/mem_ops_aligned.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 #ifndef VPX_PORTS_MEM_OPS_ALIGNED_H_
  12 #define VPX_PORTS_MEM_OPS_ALIGNED_H_
  13
  14 #include "vpx/vpx_integer.h"
  15
  16 /* \file
  17  * \brief Provides portable memory access primitives for operating on aligned
  18  *        data
  19  *
  20  * This file is split from mem_ops.h for easier maintenance. See mem_ops.h
  21  * for a more detailed description of these primitives.
  22  */
  23 #ifndef INCLUDED_BY_MEM_OPS_H
  24 #error Include mem_ops.h, not mem_ops_aligned.h directly.
  25 #endif
  26
  27 /* Architectures that provide instructions for doing this byte swapping
  28  * could redefine these macros.
  29  */
  30 #define swap_endian_16(val,raw) do {\
  31     val = ((raw>>8) & 0x00ff) \
  32           | ((raw<<8) & 0xff00);\
  33   } while(0)
  34 #define swap_endian_32(val,raw) do {\
  35     val = ((raw>>24) & 0x000000ff) \
  36           | ((raw>>8)  & 0x0000ff00) \
  37           | ((raw<<8)  & 0x00ff0000) \
  38           | ((raw<<24) & 0xff000000); \
  39   } while(0)
  40 #define swap_endian_16_se(val,raw) do {\
  41     swap_endian_16(val,raw);\
  42     val = ((val << 16) >> 16);\
  43   } while(0)
  44 #define swap_endian_32_se(val,raw) swap_endian_32(val,raw)
  45
  46 #define mem_get_ne_aligned_generic(end,sz) \
  47   static unsigned MEM_VALUE_T mem_get_##end##sz##_aligned(const void *vmem) {\
  48     const uint##sz##_t *mem = (const uint##sz##_t *)vmem;\
  49     return *mem;\
  50   }
  51
  52 #define mem_get_sne_aligned_generic(end,sz) \
  53   static signed MEM_VALUE_T mem_get_s##end##sz##_aligned(const void *vmem) {\
  54     const int##sz##_t *mem = (const int##sz##_t *)vmem;\
  55     return *mem;\
  56   }
  57
  58 #define mem_get_se_aligned_generic(end,sz) \
  59   static unsigned MEM_VALUE_T mem_get_##end##sz##_aligned(const void *vmem) {\
  60     const uint##sz##_t *mem = (const uint##sz##_t *)vmem;\
  61     unsigned MEM_VALUE_T val, raw = *mem;\
  62     swap_endian_##sz(val,raw);\
  63     return val;\
  64   }
  65
  66 #define mem_get_sse_aligned_generic(end,sz) \
  67   static signed MEM_VALUE_T mem_get_s##end##sz##_aligned(const void *vmem) {\
  68     const int##sz##_t *mem = (const int##sz##_t *)vmem;\
  69     unsigned MEM_VALUE_T val, raw = *mem;\
  70     swap_endian_##sz##_se(val,raw);\
  71     return val;\
  72   }
  73
  74 #define mem_put_ne_aligned_generic(end,sz) \
  75   static void mem_put_##end##sz##_aligned(void *vmem, MEM_VALUE_T val) {\
  76     uint##sz##_t *mem = (uint##sz##_t *)vmem;\
  77     *mem = (uint##sz##_t)val;\
  78   }
  79
  80 #define mem_put_se_aligned_generic(end,sz) \
  81   static void mem_put_##end##sz##_aligned(void *vmem, MEM_VALUE_T val) {\
  82     uint##sz##_t *mem = (uint##sz##_t *)vmem, raw;\
  83     swap_endian_##sz(raw,val);\
  84     *mem = (uint##sz##_t)raw;\
  85   }
  86
  87 #include "vpx_config.h"
  88 #if CONFIG_BIG_ENDIAN
  89 #define mem_get_be_aligned_generic(sz)  mem_get_ne_aligned_generic(be,sz)
  90 #define mem_get_sbe_aligned_generic(sz) mem_get_sne_aligned_generic(be,sz)
  91 #define mem_get_le_aligned_generic(sz)  mem_get_se_aligned_generic(le,sz)
  92 #define mem_get_sle_aligned_generic(sz) mem_get_sse_aligned_generic(le,sz)
  93 #define mem_put_be_aligned_generic(sz)  mem_put_ne_aligned_generic(be,sz)
  94 #define mem_put_le_aligned_generic(sz)  mem_put_se_aligned_generic(le,sz)
  95 #else
  96 #define mem_get_be_aligned_generic(sz)  mem_get_se_aligned_generic(be,sz)
  97 #define mem_get_sbe_aligned_generic(sz) mem_get_sse_aligned_generic(be,sz)
  98 #define mem_get_le_aligned_generic(sz)  mem_get_ne_aligned_generic(le,sz)
  99 #define mem_get_sle_aligned_generic(sz) mem_get_sne_aligned_generic(le,sz)
 100 #define mem_put_be_aligned_generic(sz)  mem_put_se_aligned_generic(be,sz)
 101 #define mem_put_le_aligned_generic(sz)  mem_put_ne_aligned_generic(le,sz)
 102 #endif
 103
 104 #undef  mem_get_be16_aligned
 105 #define mem_get_be16_aligned mem_ops_wrap_symbol(mem_get_be16_aligned)
 106 mem_get_be_aligned_generic(16)
 107
 108 #undef  mem_get_be32_aligned
 109 #define mem_get_be32_aligned mem_ops_wrap_symbol(mem_get_be32_aligned)
 110 mem_get_be_aligned_generic(32)
 111
 112 #undef  mem_get_le16_aligned
 113 #define mem_get_le16_aligned mem_ops_wrap_symbol(mem_get_le16_aligned)
 114 mem_get_le_aligned_generic(16)
 115
 116 #undef  mem_get_le32_aligned
 117 #define mem_get_le32_aligned mem_ops_wrap_symbol(mem_get_le32_aligned)
 118 mem_get_le_aligned_generic(32)
 119
 120 #undef  mem_get_sbe16_aligned
 121 #define mem_get_sbe16_aligned mem_ops_wrap_symbol(mem_get_sbe16_aligned)
 122 mem_get_sbe_aligned_generic(16)
 123
 124 #undef  mem_get_sbe32_aligned
 125 #define mem_get_sbe32_aligned mem_ops_wrap_symbol(mem_get_sbe32_aligned)
 126 mem_get_sbe_aligned_generic(32)
 127
 128 #undef  mem_get_sle16_aligned
 129 #define mem_get_sle16_aligned mem_ops_wrap_symbol(mem_get_sle16_aligned)
 130 mem_get_sle_aligned_generic(16)
 131
 132 #undef  mem_get_sle32_aligned
 133 #define mem_get_sle32_aligned mem_ops_wrap_symbol(mem_get_sle32_aligned)
 134 mem_get_sle_aligned_generic(32)
 135
 136 #undef  mem_put_be16_aligned
 137 #define mem_put_be16_aligned mem_ops_wrap_symbol(mem_put_be16_aligned)
 138 mem_put_be_aligned_generic(16)
 139
 140 #undef  mem_put_be32_aligned
 141 #define mem_put_be32_aligned mem_ops_wrap_symbol(mem_put_be32_aligned)
 142 mem_put_be_aligned_generic(32)
 143
 144 #undef  mem_put_le16_aligned
 145 #define mem_put_le16_aligned mem_ops_wrap_symbol(mem_put_le16_aligned)
 146 mem_put_le_aligned_generic(16)
 147
 148 #undef  mem_put_le32_aligned
 149 #define mem_put_le32_aligned mem_ops_wrap_symbol(mem_put_le32_aligned)
 150 mem_put_le_aligned_generic(32)
 151
 152 #undef mem_get_ne_aligned_generic
 153 #undef mem_get_se_aligned_generic
 154 #undef mem_get_sne_aligned_generic
 155 #undef mem_get_sse_aligned_generic
 156 #undef mem_put_ne_aligned_generic
 157 #undef mem_put_se_aligned_generic
 158 #undef swap_endian_16
 159 #undef swap_endian_32
 160 #undef swap_endian_16_se
 161 #undef swap_endian_32_se
 162
 163 #endif  // VPX_PORTS_MEM_OPS_ALIGNED_H_