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Initial revision
author Sam Lantinga <slouken@lokigames.com>
date Thu, 26 Apr 2001 16:45:43 +0000
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1 /*
2 SDL - Simple DirectMedia Layer
3 Copyright (C) 1997, 1998, 1999, 2000, 2001 Sam Lantinga
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
20 slouken@devolution.com
21 */
22
23 #ifdef SAVE_RCSID
24 static char rcsid =
25 "@(#) $Id$";
26 #endif
27
28
29 #if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT)
30
31 #include "SDL_types.h"
32
33 #ifdef __ELF__
34 #define ASM_VAR(X) _##X
35 #else
36 #define ASM_VAR(X) X
37 #endif
38
39 static unsigned int ASM_VAR(MMX_0080w)[] = {0x00800080, 0x00800080};
40 static unsigned int ASM_VAR(MMX_00FFw)[] = {0x00ff00ff, 0x00ff00ff};
41 static unsigned int ASM_VAR(MMX_FF00w)[] = {0xff00ff00, 0xff00ff00};
42
43 static unsigned short ASM_VAR(MMX_Ycoeff)[] = {0x004a, 0x004a, 0x004a, 0x004a};
44
45 static unsigned short ASM_VAR(MMX_UbluRGB)[] = {0x0072, 0x0072, 0x0072, 0x0072};
46 static unsigned short ASM_VAR(MMX_VredRGB)[] = {0x0059, 0x0059, 0x0059, 0x0059};
47 static unsigned short ASM_VAR(MMX_UgrnRGB)[] = {0xffea, 0xffea, 0xffea, 0xffea};
48 static unsigned short ASM_VAR(MMX_VgrnRGB)[] = {0xffd2, 0xffd2, 0xffd2, 0xffd2};
49
50 static unsigned short ASM_VAR(MMX_Ublu5x5)[] = {0x0081, 0x0081, 0x0081, 0x0081};
51 static unsigned short ASM_VAR(MMX_Vred5x5)[] = {0x0066, 0x0066, 0x0066, 0x0066};
52 static unsigned short ASM_VAR(MMX_Ugrn555)[] = {0xffe7, 0xffe7, 0xffe7, 0xffe7};
53 static unsigned short ASM_VAR(MMX_Vgrn555)[] = {0xffcc, 0xffcc, 0xffcc, 0xffcc};
54 static unsigned short ASM_VAR(MMX_Ugrn565)[] = {0xffe8, 0xffe8, 0xffe8, 0xffe8};
55 static unsigned short ASM_VAR(MMX_Vgrn565)[] = {0xffcd, 0xffcd, 0xffcd, 0xffcd};
56
57 static unsigned short ASM_VAR(MMX_red555)[] = {0x7c00, 0x7c00, 0x7c00, 0x7c00};
58 static unsigned short ASM_VAR(MMX_red565)[] = {0xf800, 0xf800, 0xf800, 0xf800};
59 static unsigned short ASM_VAR(MMX_grn555)[] = {0x03e0, 0x03e0, 0x03e0, 0x03e0};
60 static unsigned short ASM_VAR(MMX_grn565)[] = {0x07e0, 0x07e0, 0x07e0, 0x07e0};
61 static unsigned short ASM_VAR(MMX_blu5x5)[] = {0x001f, 0x001f, 0x001f, 0x001f};
62
63 /**
64 This MMX assembler is my first assembler/MMX program ever.
65 Thus it maybe buggy.
66 Send patches to:
67 mvogt@rhrk.uni-kl.de
68
69 After it worked fine I have "obfuscated" the code a bit to have
70 more parallism in the MMX units. This means I moved
71 initilisation around and delayed other instruction.
72 Performance measurement did not show that this brought any advantage
73 but in theory it _should_ be faster this way.
74
75 The overall performanve gain to the C based dither was 30%-40%.
76 The MMX routine calculates 256bit=8RGB values in each cycle
77 (4 for row1 & 4 for row2)
78
79 The red/green/blue.. coefficents are taken from the mpeg_play
80 player. They look nice, but I dont know if you can have
81 better values, to avoid integer rounding errors.
82
83
84 IMPORTANT:
85 ==========
86
87 It is a requirement that the cr/cb/lum are 8 byte aligned and
88 the out are 16byte aligned or you will/may get segfaults
89
90 */
91
92 void ColorRGBDitherYV12MMX1X( int *colortab, Uint32 *rgb_2_pix,
93 unsigned char *lum, unsigned char *cr,
94 unsigned char *cb, unsigned char *out,
95 int rows, int cols, int mod )
96 {
97 Uint32 *row1;
98 Uint32 *row2;
99
100 unsigned char* y = lum +cols*rows; // Pointer to the end
101 int x=0;
102 row1 = (Uint32 *)out; // 32 bit target
103 row2 = (Uint32 *)out+cols+mod; // start of second row
104 mod = (mod+cols+mod)*4; // increment for row1 in byte
105
106 __asm__ __volatile__ (
107 /* We don't really care about PIC - the code should be rewritten to use
108 relative addressing for the static tables, so right now we take the
109 COW hit on the pages this code resides. Big deal.
110 This spill is just to reduce register pressure in the PIC case. */
111 "pushl %%ebx\n"
112 "movl %0, %%ebx\n"
113
114 ".align 8\n"
115 "1:\n"
116
117 // create Cr (result in mm1)
118 "movd (%%ebx), %%mm1\n" // 0 0 0 0 v3 v2 v1 v0
119 "pxor %%mm7,%%mm7\n" // 00 00 00 00 00 00 00 00
120 "movd (%2), %%mm2\n" // 0 0 0 0 l3 l2 l1 l0
121 "punpcklbw %%mm7,%%mm1\n" // 0 v3 0 v2 00 v1 00 v0
122 "punpckldq %%mm1,%%mm1\n" // 00 v1 00 v0 00 v1 00 v0
123 "psubw _MMX_0080w,%%mm1\n" // mm1-128:r1 r1 r0 r0 r1 r1 r0 r0
124
125 // create Cr_g (result in mm0)
126 "movq %%mm1,%%mm0\n" // r1 r1 r0 r0 r1 r1 r0 r0
127 "pmullw _MMX_VgrnRGB,%%mm0\n"// red*-46dec=0.7136*64
128 "pmullw _MMX_VredRGB,%%mm1\n"// red*89dec=1.4013*64
129 "psraw $6, %%mm0\n" // red=red/64
130 "psraw $6, %%mm1\n" // red=red/64
131
132 // create L1 L2 (result in mm2,mm4)
133 // L2=lum+cols
134 "movq (%2,%4),%%mm3\n" // 0 0 0 0 L3 L2 L1 L0
135 "punpckldq %%mm3,%%mm2\n" // L3 L2 L1 L0 l3 l2 l1 l0
136 "movq %%mm2,%%mm4\n" // L3 L2 L1 L0 l3 l2 l1 l0
137 "pand _MMX_FF00w,%%mm2\n" // L3 0 L1 0 l3 0 l1 0
138 "pand _MMX_00FFw,%%mm4\n" // 0 L2 0 L0 0 l2 0 l0
139 "psrlw $8,%%mm2\n" // 0 L3 0 L1 0 l3 0 l1
140
141 // create R (result in mm6)
142 "movq %%mm2,%%mm5\n" // 0 L3 0 L1 0 l3 0 l1
143 "movq %%mm4,%%mm6\n" // 0 L2 0 L0 0 l2 0 l0
144 "paddsw %%mm1, %%mm5\n" // lum1+red:x R3 x R1 x r3 x r1
145 "paddsw %%mm1, %%mm6\n" // lum1+red:x R2 x R0 x r2 x r0
146 "packuswb %%mm5,%%mm5\n" // R3 R1 r3 r1 R3 R1 r3 r1
147 "packuswb %%mm6,%%mm6\n" // R2 R0 r2 r0 R2 R0 r2 r0
148 "pxor %%mm7,%%mm7\n" // 00 00 00 00 00 00 00 00
149 "punpcklbw %%mm5,%%mm6\n" // R3 R2 R1 R0 r3 r2 r1 r0
150
151 // create Cb (result in mm1)
152 "movd (%1), %%mm1\n" // 0 0 0 0 u3 u2 u1 u0
153 "punpcklbw %%mm7,%%mm1\n" // 0 u3 0 u2 00 u1 00 u0
154 "punpckldq %%mm1,%%mm1\n" // 00 u1 00 u0 00 u1 00 u0
155 "psubw _MMX_0080w,%%mm1\n" // mm1-128:u1 u1 u0 u0 u1 u1 u0 u0
156 // create Cb_g (result in mm5)
157 "movq %%mm1,%%mm5\n" // u1 u1 u0 u0 u1 u1 u0 u0
158 "pmullw _MMX_UgrnRGB,%%mm5\n" // blue*-109dec=1.7129*64
159 "pmullw _MMX_UbluRGB,%%mm1\n" // blue*114dec=1.78125*64
160 "psraw $6, %%mm5\n" // blue=red/64
161 "psraw $6, %%mm1\n" // blue=blue/64
162
163 // create G (result in mm7)
164 "movq %%mm2,%%mm3\n" // 0 L3 0 L1 0 l3 0 l1
165 "movq %%mm4,%%mm7\n" // 0 L2 0 L0 0 l2 0 l1
166 "paddsw %%mm5, %%mm3\n" // lum1+Cb_g:x G3t x G1t x g3t x g1t
167 "paddsw %%mm5, %%mm7\n" // lum1+Cb_g:x G2t x G0t x g2t x g0t
168 "paddsw %%mm0, %%mm3\n" // lum1+Cr_g:x G3 x G1 x g3 x g1
169 "paddsw %%mm0, %%mm7\n" // lum1+blue:x G2 x G0 x g2 x g0
170 "packuswb %%mm3,%%mm3\n" // G3 G1 g3 g1 G3 G1 g3 g1
171 "packuswb %%mm7,%%mm7\n" // G2 G0 g2 g0 G2 G0 g2 g0
172 "punpcklbw %%mm3,%%mm7\n" // G3 G2 G1 G0 g3 g2 g1 g0
173
174 // create B (result in mm5)
175 "movq %%mm2,%%mm3\n" // 0 L3 0 L1 0 l3 0 l1
176 "movq %%mm4,%%mm5\n" // 0 L2 0 L0 0 l2 0 l1
177 "paddsw %%mm1, %%mm3\n" // lum1+blue:x B3 x B1 x b3 x b1
178 "paddsw %%mm1, %%mm5\n" // lum1+blue:x B2 x B0 x b2 x b0
179 "packuswb %%mm3,%%mm3\n" // B3 B1 b3 b1 B3 B1 b3 b1
180 "packuswb %%mm5,%%mm5\n" // B2 B0 b2 b0 B2 B0 b2 b0
181 "punpcklbw %%mm3,%%mm5\n" // B3 B2 B1 B0 b3 b2 b1 b0
182
183 // fill destination row1 (needed are mm6=Rr,mm7=Gg,mm5=Bb)
184
185 "pxor %%mm2,%%mm2\n" // 0 0 0 0 0 0 0 0
186 "pxor %%mm4,%%mm4\n" // 0 0 0 0 0 0 0 0
187 "movq %%mm6,%%mm1\n" // R3 R2 R1 R0 r3 r2 r1 r0
188 "movq %%mm5,%%mm3\n" // B3 B2 B1 B0 b3 b2 b1 b0
189 // process lower lum
190 "punpcklbw %%mm4,%%mm1\n" // 0 r3 0 r2 0 r1 0 r0
191 "punpcklbw %%mm4,%%mm3\n" // 0 b3 0 b2 0 b1 0 b0
192 "movq %%mm1,%%mm2\n" // 0 r3 0 r2 0 r1 0 r0
193 "movq %%mm3,%%mm0\n" // 0 b3 0 b2 0 b1 0 b0
194 "punpcklwd %%mm1,%%mm3\n" // 0 r1 0 b1 0 r0 0 b0
195 "punpckhwd %%mm2,%%mm0\n" // 0 r3 0 b3 0 r2 0 b2
196
197 "pxor %%mm2,%%mm2\n" // 0 0 0 0 0 0 0 0
198 "movq %%mm7,%%mm1\n" // G3 G2 G1 G0 g3 g2 g1 g0
199 "punpcklbw %%mm1,%%mm2\n" // g3 0 g2 0 g1 0 g0 0
200 "punpcklwd %%mm4,%%mm2\n" // 0 0 g1 0 0 0 g0 0
201 "por %%mm3, %%mm2\n" // 0 r1 g1 b1 0 r0 g0 b0
202 "movq %%mm2,(%3)\n" // wrote out ! row1
203
204 "pxor %%mm2,%%mm2\n" // 0 0 0 0 0 0 0 0
205 "punpcklbw %%mm1,%%mm4\n" // g3 0 g2 0 g1 0 g0 0
206 "punpckhwd %%mm2,%%mm4\n" // 0 0 g3 0 0 0 g2 0
207 "por %%mm0, %%mm4\n" // 0 r3 g3 b3 0 r2 g2 b2
208 "movq %%mm4,8(%3)\n" // wrote out ! row1
209
210 // fill destination row2 (needed are mm6=Rr,mm7=Gg,mm5=Bb)
211 // this can be done "destructive"
212 "pxor %%mm2,%%mm2\n" // 0 0 0 0 0 0 0 0
213 "punpckhbw %%mm2,%%mm6\n" // 0 R3 0 R2 0 R1 0 R0
214 "punpckhbw %%mm1,%%mm5\n" // G3 B3 G2 B2 G1 B1 G0 B0
215 "movq %%mm5,%%mm1\n" // G3 B3 G2 B2 G1 B1 G0 B0
216 "punpcklwd %%mm6,%%mm1\n" // 0 R1 G1 B1 0 R0 G0 B0
217 "movq %%mm1,(%5)\n" // wrote out ! row2
218 "punpckhwd %%mm6,%%mm5\n" // 0 R3 G3 B3 0 R2 G2 B2
219 "movq %%mm5,8(%5)\n" // wrote out ! row2
220
221 "addl $4,%2\n" // lum+4
222 "leal 16(%3),%3\n" // row1+16
223 "leal 16(%5),%5\n" // row2+16
224 "addl $2, %%ebx\n" // cr+2
225 "addl $2, %1\n" // cb+2
226
227 "addl $4,%6\n" // x+4
228 "cmpl %4,%6\n"
229
230 "jl 1b\n"
231 "addl %4, %2\n" // lum += cols
232 "addl %8, %3\n" // row1+= mod
233 "addl %8, %5\n" // row2+= mod
234 "movl $0, %6\n" // x=0
235 "cmpl %7, %2\n"
236 "jl 1b\n"
237 "emms\n"
238 "popl %%ebx\n"
239 :
240 : "m" (cr), "r"(cb),"r"(lum),
241 "r"(row1),"r"(cols),"r"(row2),"m"(x),"m"(y),"m"(mod)
242 : "%ebx"
243 );
244 }
245
246 void Color565DitherYV12MMX1X( int *colortab, Uint32 *rgb_2_pix,
247 unsigned char *lum, unsigned char *cr,
248 unsigned char *cb, unsigned char *out,
249 int rows, int cols, int mod )
250 {
251 Uint16 *row1;
252 Uint16 *row2;
253
254 unsigned char* y = lum +cols*rows; /* Pointer to the end */
255 int x=0;
256 row1 = (Uint16 *)out; /* 16 bit target */
257 row2 = (Uint16 *)out+cols+mod; /* start of second row */
258 mod = (mod+cols+mod)*2; /* increment for row1 in byte */
259
260
261 __asm__ __volatile__(
262 "pushl %%ebx\n"
263 "movl %0, %%ebx\n"
264
265 ".align 8\n"
266 "1:\n"
267 "movd (%1), %%mm0\n" // 4 Cb 0 0 0 0 u3 u2 u1 u0
268 "pxor %%mm7, %%mm7\n"
269 "movd (%%ebx), %%mm1\n" // 4 Cr 0 0 0 0 v3 v2 v1 v0
270 "punpcklbw %%mm7, %%mm0\n" // 4 W cb 0 u3 0 u2 0 u1 0 u0
271 "punpcklbw %%mm7, %%mm1\n" // 4 W cr 0 v3 0 v2 0 v1 0 v0
272 "psubw _MMX_0080w, %%mm0\n"
273 "psubw _MMX_0080w, %%mm1\n"
274 "movq %%mm0, %%mm2\n" // Cb 0 u3 0 u2 0 u1 0 u0
275 "movq %%mm1, %%mm3\n" // Cr
276 "pmullw _MMX_Ugrn565, %%mm2\n" // Cb2green 0 R3 0 R2 0 R1 0 R0
277 "movq (%2), %%mm6\n" // L1 l7 L6 L5 L4 L3 L2 L1 L0
278 "pmullw _MMX_Ublu5x5, %%mm0\n" // Cb2blue
279 "pand _MMX_00FFw, %%mm6\n" // L1 00 L6 00 L4 00 L2 00 L0
280 "pmullw _MMX_Vgrn565, %%mm3\n" // Cr2green
281 "movq (%2), %%mm7\n" // L2
282 "pmullw _MMX_Vred5x5, %%mm1\n" // Cr2red
283 "psrlw $8, %%mm7\n" // L2 00 L7 00 L5 00 L3 00 L1
284 "pmullw _MMX_Ycoeff, %%mm6\n" // lum1
285 "paddw %%mm3, %%mm2\n" // Cb2green + Cr2green == green
286 "pmullw _MMX_Ycoeff, %%mm7\n" // lum2
287
288 "movq %%mm6, %%mm4\n" // lum1
289 "paddw %%mm0, %%mm6\n" // lum1 +blue 00 B6 00 B4 00 B2 00 B0
290 "movq %%mm4, %%mm5\n" // lum1
291 "paddw %%mm1, %%mm4\n" // lum1 +red 00 R6 00 R4 00 R2 00 R0
292 "paddw %%mm2, %%mm5\n" // lum1 +green 00 G6 00 G4 00 G2 00 G0
293 "psraw $6, %%mm4\n" // R1 0 .. 64
294 "movq %%mm7, %%mm3\n" // lum2 00 L7 00 L5 00 L3 00 L1
295 "psraw $6, %%mm5\n" // G1 - .. +
296 "paddw %%mm0, %%mm7\n" // Lum2 +blue 00 B7 00 B5 00 B3 00 B1
297 "psraw $6, %%mm6\n" // B1 0 .. 64
298 "packuswb %%mm4, %%mm4\n" // R1 R1
299 "packuswb %%mm5, %%mm5\n" // G1 G1
300 "packuswb %%mm6, %%mm6\n" // B1 B1
301 "punpcklbw %%mm4, %%mm4\n"
302 "punpcklbw %%mm5, %%mm5\n"
303
304 "pand _MMX_red565, %%mm4\n"
305 "psllw $3, %%mm5\n" // GREEN 1
306 "punpcklbw %%mm6, %%mm6\n"
307 "pand _MMX_grn565, %%mm5\n"
308 "pand _MMX_red565, %%mm6\n"
309 "por %%mm5, %%mm4\n" //
310 "psrlw $11, %%mm6\n" // BLUE 1
311 "movq %%mm3, %%mm5\n" // lum2
312 "paddw %%mm1, %%mm3\n" // lum2 +red 00 R7 00 R5 00 R3 00 R1
313 "paddw %%mm2, %%mm5\n" // lum2 +green 00 G7 00 G5 00 G3 00 G1
314 "psraw $6, %%mm3\n" // R2
315 "por %%mm6, %%mm4\n" // MM4
316 "psraw $6, %%mm5\n" // G2
317 "movq (%2, %4), %%mm6\n" // L3 load lum2
318 "psraw $6, %%mm7\n"
319 "packuswb %%mm3, %%mm3\n"
320 "packuswb %%mm5, %%mm5\n"
321 "packuswb %%mm7, %%mm7\n"
322 "pand _MMX_00FFw, %%mm6\n" // L3
323 "punpcklbw %%mm3, %%mm3\n"
324 "punpcklbw %%mm5, %%mm5\n"
325 "pmullw _MMX_Ycoeff, %%mm6\n" // lum3
326 "punpcklbw %%mm7, %%mm7\n"
327 "psllw $3, %%mm5\n" // GREEN 2
328 "pand _MMX_red565, %%mm7\n"
329 "pand _MMX_red565, %%mm3\n"
330 "psrlw $11, %%mm7\n" // BLUE 2
331 "pand _MMX_grn565, %%mm5\n"
332 "por %%mm7, %%mm3\n"
333 "movq (%2,%4), %%mm7\n" // L4 load lum2
334 "por %%mm5, %%mm3\n" //
335 "psrlw $8, %%mm7\n" // L4
336 "movq %%mm4, %%mm5\n"
337 "punpcklwd %%mm3, %%mm4\n"
338 "pmullw _MMX_Ycoeff, %%mm7\n" // lum4
339 "punpckhwd %%mm3, %%mm5\n"
340
341 "movq %%mm4, (%3)\n" // write row1
342 "movq %%mm5, 8(%3)\n" // write row1
343
344 "movq %%mm6, %%mm4\n" // Lum3
345 "paddw %%mm0, %%mm6\n" // Lum3 +blue
346
347 "movq %%mm4, %%mm5\n" // Lum3
348 "paddw %%mm1, %%mm4\n" // Lum3 +red
349 "paddw %%mm2, %%mm5\n" // Lum3 +green
350 "psraw $6, %%mm4\n"
351 "movq %%mm7, %%mm3\n" // Lum4
352 "psraw $6, %%mm5\n"
353 "paddw %%mm0, %%mm7\n" // Lum4 +blue
354 "psraw $6, %%mm6\n" // Lum3 +blue
355 "movq %%mm3, %%mm0\n" // Lum4
356 "packuswb %%mm4, %%mm4\n"
357 "paddw %%mm1, %%mm3\n" // Lum4 +red
358 "packuswb %%mm5, %%mm5\n"
359 "paddw %%mm2, %%mm0\n" // Lum4 +green
360 "packuswb %%mm6, %%mm6\n"
361 "punpcklbw %%mm4, %%mm4\n"
362 "punpcklbw %%mm5, %%mm5\n"
363 "punpcklbw %%mm6, %%mm6\n"
364 "psllw $3, %%mm5\n" // GREEN 3
365 "pand _MMX_red565, %%mm4\n"
366 "psraw $6, %%mm3\n" // psr 6
367 "psraw $6, %%mm0\n"
368 "pand _MMX_red565, %%mm6\n" // BLUE
369 "pand _MMX_grn565, %%mm5\n"
370 "psrlw $11, %%mm6\n" // BLUE 3
371 "por %%mm5, %%mm4\n"
372 "psraw $6, %%mm7\n"
373 "por %%mm6, %%mm4\n"
374 "packuswb %%mm3, %%mm3\n"
375 "packuswb %%mm0, %%mm0\n"
376 "packuswb %%mm7, %%mm7\n"
377 "punpcklbw %%mm3, %%mm3\n"
378 "punpcklbw %%mm0, %%mm0\n"
379 "punpcklbw %%mm7, %%mm7\n"
380 "pand _MMX_red565, %%mm3\n"
381 "pand _MMX_red565, %%mm7\n" // BLUE
382 "psllw $3, %%mm0\n" // GREEN 4
383 "psrlw $11, %%mm7\n"
384 "pand _MMX_grn565, %%mm0\n"
385 "por %%mm7, %%mm3\n"
386 "por %%mm0, %%mm3\n"
387
388 "movq %%mm4, %%mm5\n"
389
390 "punpcklwd %%mm3, %%mm4\n"
391 "punpckhwd %%mm3, %%mm5\n"
392
393 "movq %%mm4, (%5)\n"
394 "movq %%mm5, 8(%5)\n"
395
396 "addl $8, %6\n"
397 "addl $8, %2\n"
398 "addl $4, %%ebx\n"
399 "addl $4, %1\n"
400 "cmpl %4, %6\n"
401 "leal 16(%3), %3\n"
402 "leal 16(%5),%5\n" // row2+16
403
404
405 "jl 1b\n"
406 "addl %4, %2\n" // lum += cols
407 "addl %8, %3\n" // row1+= mod
408 "addl %8, %5\n" // row2+= mod
409 "movl $0, %6\n" // x=0
410 "cmpl %7, %2\n"
411 "jl 1b\n"
412 "emms\n"
413 "popl %%ebx\n"
414 :
415 :"m" (cr), "r"(cb),"r"(lum),
416 "r"(row1),"r"(cols),"r"(row2),"m"(x),"m"(y),"m"(mod)
417 : "%ebx"
418 );
419 }
420
421 #endif /* GCC i386 inline assembly */