mem_ops_aligned.h revision ba164dffc5a6795bce97fae02b51ccf3330e15e4 
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 "vpx_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)
102mem_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)
106mem_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)
110mem_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)
114mem_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)
118mem_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)
122mem_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)
126mem_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)
130mem_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)
134mem_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)
138mem_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)
142mem_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)
146mem_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
158