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1 /*
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2 SDL - Simple DirectMedia Layer
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001 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 Library General Public
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7 License as published by the Free Software Foundation; either
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8 version 2 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 Library 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 Library General Public
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16 License along with this library; if not, write to the Free
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17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18
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19 Sam Lantinga
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20 slouken@devolution.com
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21 */
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22
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23 #ifdef SAVE_RCSID
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24 static char rcsid =
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25 "@(#) $Id$";
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26 #endif
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27
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28 #ifndef _SDL_memops_h
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29 #define _SDL_memops_h
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30
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31 /* System dependent optimized memory manipulation routines:
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32 */
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33 #include <string.h>
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34
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35 #if defined(__GNUC__) && defined(i386)
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36 /* Thanks to Brennan "Bas" Underwood, for the inspiration. :)
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37 */
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38 #define SDL_memcpy(dst, src, len) \
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39 do { \
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40 int u0, u1, u2; \
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41 __asm__ __volatile__ ( \
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42 "cld\n\t" \
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43 "rep ; movsl\n\t" \
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44 "testb $2,%b4\n\t" \
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45 "je 1f\n\t" \
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46 "movsw\n" \
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47 "1:\ttestb $1,%b4\n\t" \
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48 "je 2f\n\t" \
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49 "movsb\n" \
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50 "2:" \
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51 : "=&c" (u0), "=&D" (u1), "=&S" (u2) \
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52 : "0" ((unsigned)(len)/4), "q" (len), "1" (dst),"2" (src) \
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53 : "memory" ); \
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54 } while(0)
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55
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56 #define SDL_revcpy(dst, src, len) \
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57 do { \
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58 int u0, u1, u2; \
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59 char *dstp = (char *)(dst); \
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60 char *srcp = (char *)(src); \
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61 int n = (len); \
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62 if ( n >= 4 ) { \
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63 __asm__ __volatile__ ( \
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64 "std\n\t" \
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65 "rep ; movsl\n\t" \
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66 : "=&c" (u0), "=&D" (u1), "=&S" (u2) \
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67 : "0" (n >> 2), \
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68 "1" (dstp+(n-4)), "2" (srcp+(n-4)) \
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69 : "memory" ); \
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70 } \
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71 switch (n & 3) { \
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72 case 3: dstp[2] = srcp[2]; \
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73 case 2: dstp[1] = srcp[1]; \
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74 case 1: dstp[0] = srcp[0]; \
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75 break; \
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76 default: \
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77 break; \
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78 } \
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79 } while(0)
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80
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81 #define SDL_memmove(dst, src, len) \
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82 do { \
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83 if ( (dst) < (src) ) { \
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84 SDL_memcpy((dst), (src), (len)); \
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85 } else { \
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86 SDL_revcpy((dst), (src), (len)); \
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87 } \
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88 } while(0)
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89
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90 #define SDL_memset4(dst, val, len) \
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91 do { \
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92 int u0, u1, u2; \
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93 __asm__ __volatile__ ( \
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94 "cld\n\t" \
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95 "rep ; stosl\n\t" \
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96 : "=&D" (u0), "=&a" (u1), "=&c" (u2) \
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97 : "0" (dst), "1" (val), "2" ((Uint32)(len)) \
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98 : "memory" ); \
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99 } while(0)
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100
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101 #endif /* GNU C and x86 */
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102
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103 /* If there are no optimized versions, define the normal versions */
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104 #ifndef SDL_memcpy
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105 #define SDL_memcpy(dst, src, len) memcpy(dst, src, len)
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106 #endif
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107 #ifndef SDL_revcpy
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108 #define SDL_revcpy(dst, src, len) memmove(dst, src, len)
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109 #endif
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110 #ifndef SDL_memset4
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111 #define SDL_memset4(dst, val, len) \
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112 do { \
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113 unsigned _count = (len); \
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114 unsigned _n = (_count + 3) / 4; \
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115 Uint32 *_p = (Uint32 *)(dst); \
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116 Uint32 _val = (val); \
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117 switch (_count % 4) { \
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118 case 0: do { *_p++ = _val; \
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119 case 3: *_p++ = _val; \
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120 case 2: *_p++ = _val; \
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121 case 1: *_p++ = _val; \
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122 } while ( --_n ); \
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123 } \
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124 } while(0)
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125 #endif
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126
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127 #endif /* _SDL_memops_h */
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