Mercurial > sdl-ios-xcode
comparison src/video/SDL_blit_copy.c @ 2247:93994f65c74c
Removed hermes since it's LGPL and not compatible with a commercial license.
Prepping for using MMX and SSE intrinsics instead of inline assembly.
.. except for memcpy equivalents which only get faster if they can
exploit the parallelism of loading into multiple SIMD registers. :)
author | Sam Lantinga <slouken@libsdl.org> |
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date | Wed, 15 Aug 2007 08:21:10 +0000 |
parents | |
children | 5cd2a2293cf0 |
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2246:75daa0792bd1 | 2247:93994f65c74c |
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1 /* | |
2 SDL - Simple DirectMedia Layer | |
3 Copyright (C) 1997-2006 Sam Lantinga | |
4 | |
5 This library is free software; you can redistribute it and/or | |
6 modify it under the terms of the GNU Lesser General Public | |
7 License as published by the Free Software Foundation; either | |
8 version 2.1 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 Lesser General Public License for more details. | |
14 | |
15 You should have received a copy of the GNU Lesser General Public | |
16 License along with this library; if not, write to the Free Software | |
17 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
18 | |
19 Sam Lantinga | |
20 slouken@libsdl.org | |
21 */ | |
22 #include "SDL_config.h" | |
23 | |
24 #include "SDL_video.h" | |
25 #include "SDL_blit.h" | |
26 | |
27 /* The MMX/SSE intrinsics don't give access to specific registers for | |
28 the most memory parallelism, so we'll use GCC inline assembly here... | |
29 */ | |
30 #ifndef __GNUC__ | |
31 #undef __MMX__ | |
32 #undef __SSE__ | |
33 #endif | |
34 | |
35 #ifdef __MMX__ | |
36 static __inline__ void | |
37 SDL_memcpyMMX(Uint8 *dst, const Uint8 *src, int len) | |
38 { | |
39 int i; | |
40 | |
41 for (i = len / 64; i--;) { | |
42 __asm__ __volatile__ ( | |
43 "prefetchnta (%0)\n" | |
44 "movq (%0), %%mm0\n" | |
45 "movq 8(%0), %%mm1\n" | |
46 "movq 16(%0), %%mm2\n" | |
47 "movq 24(%0), %%mm3\n" | |
48 "movq 32(%0), %%mm4\n" | |
49 "movq 40(%0), %%mm5\n" | |
50 "movq 48(%0), %%mm6\n" | |
51 "movq 56(%0), %%mm7\n" | |
52 "movntq %%mm0, (%1)\n" | |
53 "movntq %%mm1, 8(%1)\n" | |
54 "movntq %%mm2, 16(%1)\n" | |
55 "movntq %%mm3, 24(%1)\n" | |
56 "movntq %%mm4, 32(%1)\n" | |
57 "movntq %%mm5, 40(%1)\n" | |
58 "movntq %%mm6, 48(%1)\n" | |
59 "movntq %%mm7, 56(%1)\n" | |
60 :: "r" (src), "r" (dst) : "memory"); | |
61 src += 64; | |
62 dst += 64; | |
63 } | |
64 if (len & 63) | |
65 SDL_memcpy(dst, src, len & 63); | |
66 } | |
67 #endif /* __MMX__ */ | |
68 | |
69 #ifdef __SSE__ | |
70 static __inline__ void | |
71 SDL_memcpySSE(Uint8 *dst, const Uint8 *src, int len) | |
72 { | |
73 int i; | |
74 | |
75 for (i = len / 64; i--;) { | |
76 __asm__ __volatile__ ( | |
77 "prefetchnta (%0)\n" | |
78 "movaps (%0), %%xmm0\n" | |
79 "movaps 16(%0), %%xmm1\n" | |
80 "movaps 32(%0), %%xmm2\n" | |
81 "movaps 48(%0), %%xmm3\n" | |
82 "movntps %%xmm0, (%1)\n" | |
83 "movntps %%xmm1, 16(%1)\n" | |
84 "movntps %%xmm2, 32(%1)\n" | |
85 "movntps %%xmm3, 48(%1)\n" | |
86 :: "r" (src), "r" (dst) : "memory"); | |
87 src += 64; | |
88 dst += 64; | |
89 } | |
90 if (len & 63) | |
91 SDL_memcpy(dst, src, len & 63); | |
92 } | |
93 #endif /* __SSE__ */ | |
94 | |
95 void | |
96 SDL_BlitCopy(SDL_BlitInfo * info) | |
97 { | |
98 Uint8 *src, *dst; | |
99 int w, h; | |
100 int srcskip, dstskip; | |
101 | |
102 w = info->d_width * info->dst->BytesPerPixel; | |
103 h = info->d_height; | |
104 src = info->s_pixels; | |
105 dst = info->d_pixels; | |
106 srcskip = w + info->s_skip; | |
107 dstskip = w + info->d_skip; | |
108 | |
109 #ifdef __SSE__ | |
110 if (SDL_HasSSE() && !((uintptr_t)src & 15) && !((uintptr_t)dst & 15)) { | |
111 while (h--) { | |
112 SDL_memcpySSE(dst, src, w); | |
113 src += srcskip; | |
114 dst += dstskip; | |
115 } | |
116 return; | |
117 } | |
118 #endif | |
119 | |
120 #ifdef __MMX__ | |
121 if (SDL_HasMMX() && !((uintptr_t)src & 7) && !((uintptr_t)dst & 7)) { | |
122 while (h--) { | |
123 SDL_memcpyMMX(dst, src, w); | |
124 src += srcskip; | |
125 dst += dstskip; | |
126 } | |
127 __asm__ __volatile__(" emms\n"::); | |
128 return; | |
129 } | |
130 #endif | |
131 | |
132 while (h--) { | |
133 SDL_memcpy(dst, src, w); | |
134 src += srcskip; | |
135 dst += dstskip; | |
136 } | |
137 } | |
138 | |
139 void | |
140 SDL_BlitCopyOverlap(SDL_BlitInfo * info) | |
141 { | |
142 Uint8 *src, *dst; | |
143 int w, h; | |
144 int skip; | |
145 | |
146 w = info->d_width * info->dst->BytesPerPixel; | |
147 h = info->d_height; | |
148 src = info->s_pixels; | |
149 dst = info->d_pixels; | |
150 skip = w + info->s_skip; | |
151 if ((dst < src) || (dst >= (src + h*skip))) { | |
152 SDL_BlitCopy(info); | |
153 } else { | |
154 src += ((h - 1) * skip); | |
155 dst += ((h - 1) * skip); | |
156 while (h--) { | |
157 SDL_revcpy(dst, src, w); | |
158 src -= skip; | |
159 dst -= skip; | |
160 } | |
161 } | |
162 } | |
163 | |
164 /* vi: set ts=4 sw=4 expandtab: */ |