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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 5131 | clevermous | 1 | /* |
| 2 | SDL - Simple DirectMedia Layer |
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| 3 | Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga |
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| 4 | |||
| 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 | |||
| 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 | |||
| 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 | |||
| 19 | Sam Lantinga |
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| 20 | slouken@devolution.com |
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| 21 | */ |
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| 22 | |||
| 23 | #ifdef SAVE_RCSID |
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| 24 | static char rcsid = |
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| 25 | "@(#) $Id: SDL_memops.h,v 1.2 2001/04/26 16:50:18 hercules Exp $"; |
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| 26 | #endif |
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| 27 | |||
| 28 | #ifndef _SDL_memops_h |
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| 29 | #define _SDL_memops_h |
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| 30 | |||
| 31 | /* System dependent optimized memory manipulation routines: |
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| 32 | */ |
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| 33 | #include |
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| 34 | |||
| 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 | |||
| 56 | #define SDL_memcpy4(dst, src, len) \ |
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| 57 | do { \ |
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| 58 | int ecx, edi, esi; \ |
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| 59 | __asm__ __volatile__ ( \ |
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| 60 | "cld\n\t" \ |
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| 61 | "rep ; movsl" \ |
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| 62 | : "=&c" (ecx), "=&D" (edi), "=&S" (esi) \ |
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| 63 | : "0" ((unsigned)(len)), "1" (dst), "2" (src) \ |
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| 64 | : "memory" ); \ |
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| 65 | } while(0) |
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| 66 | |||
| 67 | #define SDL_revcpy(dst, src, len) \ |
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| 68 | do { \ |
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| 69 | int u0, u1, u2; \ |
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| 70 | char *dstp = (char *)(dst); \ |
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| 71 | char *srcp = (char *)(src); \ |
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| 72 | int n = (len); \ |
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| 73 | if ( n >= 4 ) { \ |
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| 74 | __asm__ __volatile__ ( \ |
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| 75 | "std\n\t" \ |
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| 76 | "rep ; movsl\n\t" \ |
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| 77 | : "=&c" (u0), "=&D" (u1), "=&S" (u2) \ |
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| 78 | : "0" (n >> 2), \ |
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| 79 | "1" (dstp+(n-4)), "2" (srcp+(n-4)) \ |
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| 80 | : "memory" ); \ |
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| 81 | } \ |
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| 82 | switch (n & 3) { \ |
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| 83 | case 3: dstp[2] = srcp[2]; \ |
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| 84 | case 2: dstp[1] = srcp[1]; \ |
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| 85 | case 1: dstp[0] = srcp[0]; \ |
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| 86 | break; \ |
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| 87 | default: \ |
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| 88 | break; \ |
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| 89 | } \ |
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| 90 | } while(0) |
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| 91 | |||
| 92 | #define SDL_memmove(dst, src, len) \ |
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| 93 | do { \ |
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| 94 | if ( (dst) < (src) ) { \ |
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| 95 | SDL_memcpy((dst), (src), (len)); \ |
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| 96 | } else { \ |
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| 97 | SDL_revcpy((dst), (src), (len)); \ |
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| 98 | } \ |
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| 99 | } while(0) |
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| 100 | |||
| 101 | #define SDL_memset4(dst, val, len) \ |
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| 102 | do { \ |
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| 103 | int u0, u1, u2; \ |
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| 104 | __asm__ __volatile__ ( \ |
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| 105 | "cld\n\t" \ |
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| 106 | "rep ; stosl\n\t" \ |
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| 107 | : "=&D" (u0), "=&a" (u1), "=&c" (u2) \ |
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| 108 | : "0" (dst), "1" (val), "2" ((Uint32)(len)) \ |
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| 109 | : "memory" ); \ |
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| 110 | } while(0) |
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| 111 | |||
| 112 | #endif /* GNU C and x86 */ |
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| 113 | |||
| 114 | /* If there are no optimized versions, define the normal versions */ |
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| 115 | #ifndef SDL_memcpy |
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| 116 | #define SDL_memcpy(dst, src, len) memcpy(dst, src, len) |
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| 117 | #endif |
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| 118 | |||
| 119 | #ifndef SDL_memcpy4 |
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| 120 | #define SDL_memcpy4(dst, src, len) memcpy(dst, src, (len) << 2) |
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| 121 | #endif |
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| 122 | |||
| 123 | #ifndef SDL_revcpy |
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| 124 | #define SDL_revcpy(dst, src, len) memmove(dst, src, len) |
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| 125 | #endif |
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| 126 | |||
| 127 | #ifndef SDL_memset4 |
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| 128 | #define SDL_memset4(dst, val, len) \ |
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| 129 | do { \ |
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| 130 | unsigned _count = (len); \ |
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| 131 | unsigned _n = (_count + 3) / 4; \ |
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| 132 | Uint32 *_p = (Uint32 *)(dst); \ |
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| 133 | Uint32 _val = (val); \ |
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| 134 | switch (_count % 4) { \ |
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| 135 | case 0: do { *_p++ = _val; \ |
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| 136 | case 3: *_p++ = _val; \ |
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| 137 | case 2: *_p++ = _val; \ |
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| 138 | case 1: *_p++ = _val; \ |
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| 139 | } while ( --_n ); \ |
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| 140 | } \ |
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| 141 | } while(0) |
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| 142 | #endif |
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| 143 | |||
| 144 | #endif /* _SDL_memops_h */ |