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annotate include/SDL_endian.h @ 1581:c2c72a31f1bc

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Eric rocks. :)
author Sam Lantinga <slouken@libsdl.org>
date Wed, 22 Mar 2006 06:08:59 +0000
parents d45aefcac017
children 782fd950bd46 c121d94672cb 6832b00d3594
rev   line source
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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997-2006 Sam Lantinga
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4
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5 This library is free software; you can redistribute it and/or
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6 modify it under the terms of the GNU Lesser General Public
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7 License as published by the Free Software Foundation; either
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8 version 2.1 of the License, or (at your option) any later version.
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9
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10 This library is distributed in the hope that it will be useful,
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11 but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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13 Lesser General Public License for more details.
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14
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15 You should have received a copy of the GNU Lesser General Public
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16 License along with this library; if not, write to the Free Software
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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18
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19 Sam Lantinga
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20 slouken@libsdl.org
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21 */
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22
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23 /* Functions for reading and writing endian-specific values */
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24
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25 #ifndef _SDL_endian_h
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26 #define _SDL_endian_h
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27
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28 #include "SDL_stdinc.h"
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29
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30 /* The two types of endianness */
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31 #define SDL_LIL_ENDIAN 1234
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32 #define SDL_BIG_ENDIAN 4321
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33
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34 #ifndef SDL_BYTEORDER /* Not defined in SDL_config.h? */
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35 #if defined(__hppa__) || \
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36 defined(__m68k__) || defined(mc68000) || defined(_M_M68K) || \
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37 (defined(__MIPS__) && defined(__MISPEB__)) || \
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38 defined(__ppc__) || defined(__POWERPC__) || defined(_M_PPC) || \
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39 defined(__sparc__)
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40 #define SDL_BYTEORDER SDL_BIG_ENDIAN
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41 #else
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42 #define SDL_BYTEORDER SDL_LIL_ENDIAN
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43 #endif
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44 #endif /* !SDL_BYTEORDER */
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45
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46
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47 #include "begin_code.h"
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48 /* Set up for C function definitions, even when using C++ */
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49 #ifdef __cplusplus
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50 extern "C" {
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51 #endif
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52
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53 /* Use inline functions for compilers that support them, and static
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54 functions for those that do not. Because these functions become
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55 static for compilers that do not support inline functions, this
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56 header should only be included in files that actually use them.
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57 */
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58 #if defined(__GNUC__) && defined(__i386__) && \
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59 !(__GNUC__ == 2 && __GNUC_MINOR__ == 95 /* broken gcc version */)
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60 static __inline__ Uint16 SDL_Swap16(Uint16 x)
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61 {
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62 __asm__("xchgb %b0,%h0" : "=q" (x) : "0" (x));
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63 return x;
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64 }
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65 #elif defined(__GNUC__) && defined(__x86_64__)
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66 static __inline__ Uint16 SDL_Swap16(Uint16 x)
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67 {
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68 __asm__("xchgb %b0,%h0" : "=Q" (x) : "0" (x));
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69 return x;
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70 }
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71 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
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72 static __inline__ Uint16 SDL_Swap16(Uint16 x)
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73 {
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74 Uint16 result;
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75
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76 __asm__("rlwimi %0,%2,8,16,23" : "=&r" (result) : "0" (x >> 8), "r" (x));
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77 return result;
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78 }
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79 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__))
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80 static __inline__ Uint16 SDL_Swap16(Uint16 x)
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81 {
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82 __asm__("rorw #8,%0" : "=d" (x) : "0" (x) : "cc");
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83 return x;
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84 }
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85 #else
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86 static __inline__ Uint16 SDL_Swap16(Uint16 x) {
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87 return((x<<8)|(x>>8));
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88 }
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89 #endif
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90
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91 #if defined(__GNUC__) && defined(__i386__)
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92 static __inline__ Uint32 SDL_Swap32(Uint32 x)
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93 {
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94 __asm__("bswap %0" : "=r" (x) : "0" (x));
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95 return x;
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96 }
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97 #elif defined(__GNUC__) && defined(__x86_64__)
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98 static __inline__ Uint32 SDL_Swap32(Uint32 x)
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99 {
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100 __asm__("bswapl %0" : "=r" (x) : "0" (x));
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101 return x;
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102 }
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103 #elif defined(__GNUC__) && (defined(__powerpc__) || defined(__ppc__))
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104 static __inline__ Uint32 SDL_Swap32(Uint32 x)
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105 {
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106 Uint32 result;
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107
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108 __asm__("rlwimi %0,%2,24,16,23" : "=&r" (result) : "0" (x>>24), "r" (x));
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109 __asm__("rlwimi %0,%2,8,8,15" : "=&r" (result) : "0" (result), "r" (x));
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110 __asm__("rlwimi %0,%2,24,0,7" : "=&r" (result) : "0" (result), "r" (x));
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111 return result;
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112 }
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113 #elif defined(__GNUC__) && (defined(__M68000__) || defined(__M68020__))
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114 static __inline__ Uint32 SDL_Swap32(Uint32 x)
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115 {
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116 __asm__("rorw #8,%0\n\tswap %0\n\trorw #8,%0" : "=d" (x) : "0" (x) : "cc");
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117 return x;
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118 }
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119 #else
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120 static __inline__ Uint32 SDL_Swap32(Uint32 x) {
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121 return((x<<24)|((x<<8)&0x00FF0000)|((x>>8)&0x0000FF00)|(x>>24));
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122 }
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123 #endif
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124
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125 #ifdef SDL_HAS_64BIT_TYPE
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126 #if defined(__GNUC__) && defined(__i386__)
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127 static __inline__ Uint64 SDL_Swap64(Uint64 x)
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128 {
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129 union {
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130 struct { Uint32 a,b; } s;
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131 Uint64 u;
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132 } v;
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133 v.u = x;
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134 __asm__("bswapl %0 ; bswapl %1 ; xchgl %0,%1"
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135 : "=r" (v.s.a), "=r" (v.s.b)
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136 : "0" (v.s.a), "1" (v.s.b));
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137 return v.u;
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138 }
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139 #elif defined(__GNUC__) && defined(__x86_64__)
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140 static __inline__ Uint64 SDL_Swap64(Uint64 x)
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141 {
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142 __asm__("bswapq %0" : "=r" (x) : "0" (x));
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143 return x;
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144 }
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145 #else
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146 static __inline__ Uint64 SDL_Swap64(Uint64 x)
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147 {
0
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148 Uint32 hi, lo;
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149
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150 /* Separate into high and low 32-bit values and swap them */
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151 lo = (Uint32)(x&0xFFFFFFFF);
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152 x >>= 32;
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153 hi = (Uint32)(x&0xFFFFFFFF);
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154 x = SDL_Swap32(lo);
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155 x <<= 32;
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156 x |= SDL_Swap32(hi);
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157 return(x);
0
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158 }
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159 #endif
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160 #else
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161 /* This is mainly to keep compilers from complaining in SDL code.
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162 If there is no real 64-bit datatype, then compilers will complain about
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163 the fake 64-bit datatype that SDL provides when it compiles user code.
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164 */
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165 #define SDL_Swap64(X) (X)
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166 #endif /* SDL_HAS_64BIT_TYPE */
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167
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168
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169 /* Byteswap item from the specified endianness to the native endianness */
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170 #if SDL_BYTEORDER == SDL_LIL_ENDIAN
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171 #define SDL_SwapLE16(X) (X)
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172 #define SDL_SwapLE32(X) (X)
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173 #define SDL_SwapLE64(X) (X)
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174 #define SDL_SwapBE16(X) SDL_Swap16(X)
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175 #define SDL_SwapBE32(X) SDL_Swap32(X)
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176 #define SDL_SwapBE64(X) SDL_Swap64(X)
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177 #else
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178 #define SDL_SwapLE16(X) SDL_Swap16(X)
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179 #define SDL_SwapLE32(X) SDL_Swap32(X)
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180 #define SDL_SwapLE64(X) SDL_Swap64(X)
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181 #define SDL_SwapBE16(X) (X)
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182 #define SDL_SwapBE32(X) (X)
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183 #define SDL_SwapBE64(X) (X)
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184 #endif
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185
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186 /* Ends C function definitions when using C++ */
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187 #ifdef __cplusplus
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188 }
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189 #endif
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190 #include "close_code.h"
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191
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192 #endif /* _SDL_endian_h */