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