Mercurial > sdl-ios-xcode
annotate src/video/SDL_memops.h @ 1315:e94b0d7c33bc
Merged useful fixes from 1.3 branch
| author | Sam Lantinga <slouken@libsdl.org> |
|---|---|
| date | Wed, 01 Feb 2006 08:17:54 +0000 |
| parents | c9b51268668f |
| children |
| rev | line source |
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| 0 | 1 /* |
| 2 SDL - Simple DirectMedia Layer | |
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3 Copyright (C) 1997-2006 Sam Lantinga |
| 0 | 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 Lesser General Public |
| 0 | 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. |
| 0 | 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 | |
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13 Lesser General Public License for more details. |
| 0 | 14 |
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Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
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15 You should have received a copy of the GNU Lesser General Public |
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c9b51268668f
Updated copyright information and removed rcs id lines (problematic in branch merges)
Sam Lantinga <slouken@libsdl.org>
parents:
769
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16 License along with this library; if not, write to the Free Software |
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c9b51268668f
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Sam Lantinga <slouken@libsdl.org>
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17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 0 | 18 |
| 19 Sam Lantinga | |
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20 slouken@libsdl.org |
| 0 | 21 */ |
| 22 | |
| 23 #ifndef _SDL_memops_h | |
| 24 #define _SDL_memops_h | |
| 25 | |
| 26 /* System dependent optimized memory manipulation routines: | |
| 27 */ | |
| 28 #include <string.h> | |
| 29 | |
| 30 #if defined(__GNUC__) && defined(i386) | |
| 31 /* Thanks to Brennan "Bas" Underwood, for the inspiration. :) | |
| 32 */ | |
| 33 #define SDL_memcpy(dst, src, len) \ | |
| 34 do { \ | |
| 35 int u0, u1, u2; \ | |
| 36 __asm__ __volatile__ ( \ | |
| 37 "cld\n\t" \ | |
| 38 "rep ; movsl\n\t" \ | |
| 39 "testb $2,%b4\n\t" \ | |
| 40 "je 1f\n\t" \ | |
| 41 "movsw\n" \ | |
| 42 "1:\ttestb $1,%b4\n\t" \ | |
| 43 "je 2f\n\t" \ | |
| 44 "movsb\n" \ | |
| 45 "2:" \ | |
| 46 : "=&c" (u0), "=&D" (u1), "=&S" (u2) \ | |
| 47 : "0" ((unsigned)(len)/4), "q" (len), "1" (dst),"2" (src) \ | |
| 48 : "memory" ); \ | |
| 49 } while(0) | |
| 50 | |
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51 #define SDL_memcpy4(dst, src, len) \ |
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52 do { \ |
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53 int ecx, edi, esi; \ |
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54 __asm__ __volatile__ ( \ |
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55 "cld\n\t" \ |
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56 "rep ; movsl" \ |
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57 : "=&c" (ecx), "=&D" (edi), "=&S" (esi) \ |
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58 : "0" ((unsigned)(len)), "1" (dst), "2" (src) \ |
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59 : "memory" ); \ |
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60 } while(0) |
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61 |
| 0 | 62 #define SDL_revcpy(dst, src, len) \ |
| 63 do { \ | |
| 64 int u0, u1, u2; \ | |
| 65 char *dstp = (char *)(dst); \ | |
| 66 char *srcp = (char *)(src); \ | |
| 67 int n = (len); \ | |
| 68 if ( n >= 4 ) { \ | |
| 69 __asm__ __volatile__ ( \ | |
| 70 "std\n\t" \ | |
| 71 "rep ; movsl\n\t" \ | |
| 72 : "=&c" (u0), "=&D" (u1), "=&S" (u2) \ | |
| 73 : "0" (n >> 2), \ | |
| 74 "1" (dstp+(n-4)), "2" (srcp+(n-4)) \ | |
| 75 : "memory" ); \ | |
| 76 } \ | |
| 77 switch (n & 3) { \ | |
| 78 case 3: dstp[2] = srcp[2]; \ | |
| 79 case 2: dstp[1] = srcp[1]; \ | |
| 80 case 1: dstp[0] = srcp[0]; \ | |
| 81 break; \ | |
| 82 default: \ | |
| 83 break; \ | |
| 84 } \ | |
| 85 } while(0) | |
| 86 | |
| 87 #define SDL_memmove(dst, src, len) \ | |
| 88 do { \ | |
| 89 if ( (dst) < (src) ) { \ | |
| 90 SDL_memcpy((dst), (src), (len)); \ | |
| 91 } else { \ | |
| 92 SDL_revcpy((dst), (src), (len)); \ | |
| 93 } \ | |
| 94 } while(0) | |
| 95 | |
| 96 #define SDL_memset4(dst, val, len) \ | |
| 97 do { \ | |
| 98 int u0, u1, u2; \ | |
| 99 __asm__ __volatile__ ( \ | |
| 100 "cld\n\t" \ | |
| 101 "rep ; stosl\n\t" \ | |
| 102 : "=&D" (u0), "=&a" (u1), "=&c" (u2) \ | |
| 103 : "0" (dst), "1" (val), "2" ((Uint32)(len)) \ | |
| 104 : "memory" ); \ | |
| 105 } while(0) | |
| 106 | |
| 107 #endif /* GNU C and x86 */ | |
| 108 | |
| 109 /* If there are no optimized versions, define the normal versions */ | |
| 110 #ifndef SDL_memcpy | |
| 111 #define SDL_memcpy(dst, src, len) memcpy(dst, src, len) | |
| 112 #endif | |
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113 |
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114 #ifndef SDL_memcpy4 |
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115 #define SDL_memcpy4(dst, src, len) memcpy(dst, src, (len) << 2) |
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116 #endif |
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117 |
| 0 | 118 #ifndef SDL_revcpy |
| 119 #define SDL_revcpy(dst, src, len) memmove(dst, src, len) | |
| 120 #endif | |
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121 |
| 0 | 122 #ifndef SDL_memset4 |
| 123 #define SDL_memset4(dst, val, len) \ | |
| 124 do { \ | |
| 125 unsigned _count = (len); \ | |
| 126 unsigned _n = (_count + 3) / 4; \ | |
| 127 Uint32 *_p = (Uint32 *)(dst); \ | |
| 128 Uint32 _val = (val); \ | |
| 129 switch (_count % 4) { \ | |
| 130 case 0: do { *_p++ = _val; \ | |
| 131 case 3: *_p++ = _val; \ | |
| 132 case 2: *_p++ = _val; \ | |
| 133 case 1: *_p++ = _val; \ | |
| 134 } while ( --_n ); \ | |
| 135 } \ | |
| 136 } while(0) | |
| 137 #endif | |
| 138 | |
| 139 #endif /* _SDL_memops_h */ |