Mercurial > sdl-ios-xcode
annotate src/video/SDL_memops.h @ 337:9154ec9ca3d2
Explicitly specify the SDL API calling convention (C by default)
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Thu, 11 Apr 2002 14:35:16 +0000 |
| parents | f6ffac90895c |
| children | b8d311d90021 |
| rev | line source |
|---|---|
| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
|
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Updated copyright information for 2002
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3 Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga |
| 0 | 4 |
| 5 This library is free software; you can redistribute it and/or | |
| 6 modify it under the terms of the GNU Library General Public | |
| 7 License as published by the Free Software Foundation; either | |
| 8 version 2 of the License, or (at your option) any later version. | |
| 9 | |
| 10 This library is distributed in the hope that it will be useful, | |
| 11 but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| 12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
| 13 Library General Public License for more details. | |
| 14 | |
| 15 You should have received a copy of the GNU Library General Public | |
| 16 License along with this library; if not, write to the Free | |
| 17 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA | |
| 18 | |
| 19 Sam Lantinga | |
|
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifdef SAVE_RCSID | |
| 24 static char rcsid = | |
| 25 "@(#) $Id$"; | |
| 26 #endif | |
| 27 | |
| 28 #ifndef _SDL_memops_h | |
| 29 #define _SDL_memops_h | |
| 30 | |
| 31 /* System dependent optimized memory manipulation routines: | |
| 32 */ | |
| 33 #include <string.h> | |
| 34 | |
| 35 #if defined(__GNUC__) && defined(i386) | |
| 36 /* Thanks to Brennan "Bas" Underwood, for the inspiration. :) | |
| 37 */ | |
| 38 #define SDL_memcpy(dst, src, len) \ | |
| 39 do { \ | |
| 40 int u0, u1, u2; \ | |
| 41 __asm__ __volatile__ ( \ | |
| 42 "cld\n\t" \ | |
| 43 "rep ; movsl\n\t" \ | |
| 44 "testb $2,%b4\n\t" \ | |
| 45 "je 1f\n\t" \ | |
| 46 "movsw\n" \ | |
| 47 "1:\ttestb $1,%b4\n\t" \ | |
| 48 "je 2f\n\t" \ | |
| 49 "movsb\n" \ | |
| 50 "2:" \ | |
| 51 : "=&c" (u0), "=&D" (u1), "=&S" (u2) \ | |
| 52 : "0" ((unsigned)(len)/4), "q" (len), "1" (dst),"2" (src) \ | |
| 53 : "memory" ); \ | |
| 54 } while(0) | |
| 55 | |
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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 |
| 0 | 67 #define SDL_revcpy(dst, src, len) \ |
| 68 do { \ | |
| 69 int u0, u1, u2; \ | |
| 70 char *dstp = (char *)(dst); \ | |
| 71 char *srcp = (char *)(src); \ | |
| 72 int n = (len); \ | |
| 73 if ( n >= 4 ) { \ | |
| 74 __asm__ __volatile__ ( \ | |
| 75 "std\n\t" \ | |
| 76 "rep ; movsl\n\t" \ | |
| 77 : "=&c" (u0), "=&D" (u1), "=&S" (u2) \ | |
| 78 : "0" (n >> 2), \ | |
| 79 "1" (dstp+(n-4)), "2" (srcp+(n-4)) \ | |
| 80 : "memory" ); \ | |
| 81 } \ | |
| 82 switch (n & 3) { \ | |
| 83 case 3: dstp[2] = srcp[2]; \ | |
| 84 case 2: dstp[1] = srcp[1]; \ | |
| 85 case 1: dstp[0] = srcp[0]; \ | |
| 86 break; \ | |
| 87 default: \ | |
| 88 break; \ | |
| 89 } \ | |
| 90 } while(0) | |
| 91 | |
| 92 #define SDL_memmove(dst, src, len) \ | |
| 93 do { \ | |
| 94 if ( (dst) < (src) ) { \ | |
| 95 SDL_memcpy((dst), (src), (len)); \ | |
| 96 } else { \ | |
| 97 SDL_revcpy((dst), (src), (len)); \ | |
| 98 } \ | |
| 99 } while(0) | |
| 100 | |
| 101 #define SDL_memset4(dst, val, len) \ | |
| 102 do { \ | |
| 103 int u0, u1, u2; \ | |
| 104 __asm__ __volatile__ ( \ | |
| 105 "cld\n\t" \ | |
| 106 "rep ; stosl\n\t" \ | |
| 107 : "=&D" (u0), "=&a" (u1), "=&c" (u2) \ | |
| 108 : "0" (dst), "1" (val), "2" ((Uint32)(len)) \ | |
| 109 : "memory" ); \ | |
| 110 } while(0) | |
| 111 | |
| 112 #endif /* GNU C and x86 */ | |
| 113 | |
| 114 /* If there are no optimized versions, define the normal versions */ | |
| 115 #ifndef SDL_memcpy | |
| 116 #define SDL_memcpy(dst, src, len) memcpy(dst, src, len) | |
| 117 #endif | |
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118 |
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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 |
| 0 | 123 #ifndef SDL_revcpy |
| 124 #define SDL_revcpy(dst, src, len) memmove(dst, src, len) | |
| 125 #endif | |
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126 |
| 0 | 127 #ifndef SDL_memset4 |
| 128 #define SDL_memset4(dst, val, len) \ | |
| 129 do { \ | |
| 130 unsigned _count = (len); \ | |
| 131 unsigned _n = (_count + 3) / 4; \ | |
| 132 Uint32 *_p = (Uint32 *)(dst); \ | |
| 133 Uint32 _val = (val); \ | |
| 134 switch (_count % 4) { \ | |
| 135 case 0: do { *_p++ = _val; \ | |
| 136 case 3: *_p++ = _val; \ | |
| 137 case 2: *_p++ = _val; \ | |
| 138 case 1: *_p++ = _val; \ | |
| 139 } while ( --_n ); \ | |
| 140 } \ | |
| 141 } while(0) | |
| 142 #endif | |
| 143 | |
| 144 #endif /* _SDL_memops_h */ |