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annotate include/SDL_endian.h @ 1622:5bbfc3e20e10

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Fixed bug #191 [I opted to go for a warning, since I often tweak configure.in, but don't want to rebuild the entire project] One thing that was lost in the switch from automake to the new build system is that there is now no rule to build configure from configure.in. IMHO, if configure.in gets changed, then at the very least, the build system should print out a warning (better, again IMHO, an error) about this fact. Else, you easily forget about this when modifying configure.in.
author Sam Lantinga <slouken@libsdl.org>
date Thu, 13 Apr 2006 13:23:56 +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 */