| 0,0 → 1,144 |
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| /* |
| SDL - Simple DirectMedia Layer |
| Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Library General Public |
| License as published by the Free Software Foundation; either |
| version 2 of the License, or (at your option) any later version. |
| |
| This library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Library General Public License for more details. |
| |
| You should have received a copy of the GNU Library General Public |
| License along with this library; if not, write to the Free |
| Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| |
| Sam Lantinga |
| slouken@devolution.com |
| */ |
| |
| #ifdef SAVE_RCSID |
| static char rcsid = |
| "@(#) $Id: SDL_memops.h,v 1.2 2001/04/26 16:50:18 hercules Exp $"; |
| #endif |
| |
| #ifndef _SDL_memops_h |
| #define _SDL_memops_h |
| |
| /* System dependent optimized memory manipulation routines: |
| */ |
| #include <string.h> |
| |
| #if defined(__GNUC__) && defined(i386) |
| /* Thanks to Brennan "Bas" Underwood, for the inspiration. :) |
| */ |
| #define SDL_memcpy(dst, src, len) \ |
| do { \ |
| int u0, u1, u2; \ |
| __asm__ __volatile__ ( \ |
| "cld\n\t" \ |
| "rep ; movsl\n\t" \ |
| "testb $2,%b4\n\t" \ |
| "je 1f\n\t" \ |
| "movsw\n" \ |
| "1:\ttestb $1,%b4\n\t" \ |
| "je 2f\n\t" \ |
| "movsb\n" \ |
| "2:" \ |
| : "=&c" (u0), "=&D" (u1), "=&S" (u2) \ |
| : "0" ((unsigned)(len)/4), "q" (len), "1" (dst),"2" (src) \ |
| : "memory" ); \ |
| } while(0) |
| |
| #define SDL_memcpy4(dst, src, len) \ |
| do { \ |
| int ecx, edi, esi; \ |
| __asm__ __volatile__ ( \ |
| "cld\n\t" \ |
| "rep ; movsl" \ |
| : "=&c" (ecx), "=&D" (edi), "=&S" (esi) \ |
| : "0" ((unsigned)(len)), "1" (dst), "2" (src) \ |
| : "memory" ); \ |
| } while(0) |
| |
| #define SDL_revcpy(dst, src, len) \ |
| do { \ |
| int u0, u1, u2; \ |
| char *dstp = (char *)(dst); \ |
| char *srcp = (char *)(src); \ |
| int n = (len); \ |
| if ( n >= 4 ) { \ |
| __asm__ __volatile__ ( \ |
| "std\n\t" \ |
| "rep ; movsl\n\t" \ |
| : "=&c" (u0), "=&D" (u1), "=&S" (u2) \ |
| : "0" (n >> 2), \ |
| "1" (dstp+(n-4)), "2" (srcp+(n-4)) \ |
| : "memory" ); \ |
| } \ |
| switch (n & 3) { \ |
| case 3: dstp[2] = srcp[2]; \ |
| case 2: dstp[1] = srcp[1]; \ |
| case 1: dstp[0] = srcp[0]; \ |
| break; \ |
| default: \ |
| break; \ |
| } \ |
| } while(0) |
| |
| #define SDL_memmove(dst, src, len) \ |
| do { \ |
| if ( (dst) < (src) ) { \ |
| SDL_memcpy((dst), (src), (len)); \ |
| } else { \ |
| SDL_revcpy((dst), (src), (len)); \ |
| } \ |
| } while(0) |
| |
| #define SDL_memset4(dst, val, len) \ |
| do { \ |
| int u0, u1, u2; \ |
| __asm__ __volatile__ ( \ |
| "cld\n\t" \ |
| "rep ; stosl\n\t" \ |
| : "=&D" (u0), "=&a" (u1), "=&c" (u2) \ |
| : "0" (dst), "1" (val), "2" ((Uint32)(len)) \ |
| : "memory" ); \ |
| } while(0) |
| |
| #endif /* GNU C and x86 */ |
| |
| /* If there are no optimized versions, define the normal versions */ |
| #ifndef SDL_memcpy |
| #define SDL_memcpy(dst, src, len) memcpy(dst, src, len) |
| #endif |
| |
| #ifndef SDL_memcpy4 |
| #define SDL_memcpy4(dst, src, len) memcpy(dst, src, (len) << 2) |
| #endif |
| |
| #ifndef SDL_revcpy |
| #define SDL_revcpy(dst, src, len) memmove(dst, src, len) |
| #endif |
| |
| #ifndef SDL_memset4 |
| #define SDL_memset4(dst, val, len) \ |
| do { \ |
| unsigned _count = (len); \ |
| unsigned _n = (_count + 3) / 4; \ |
| Uint32 *_p = (Uint32 *)(dst); \ |
| Uint32 _val = (val); \ |
| switch (_count % 4) { \ |
| case 0: do { *_p++ = _val; \ |
| case 3: *_p++ = _val; \ |
| case 2: *_p++ = _val; \ |
| case 1: *_p++ = _val; \ |
| } while ( --_n ); \ |
| } \ |
| } while(0) |
| #endif |
| |
| #endif /* _SDL_memops_h */ |