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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 (at) libsdl.org
     21 */
     22 #include "SDL_config.h"
     23 
     24 #if (__GNUC__ > 2) && defined(__i386__) && __OPTIMIZE__ && SDL_ASSEMBLY_ROUTINES
     25 
     26 #include "SDL_stdinc.h"
     27 
     28 #include "mmx.h"
     29 
     30 /* *INDENT-OFF* */
     31 
     32 static mmx_t MMX_0080w    = { .ud = {0x00800080, 0x00800080} };
     33 static mmx_t MMX_00FFw    = { .ud = {0x00ff00ff, 0x00ff00ff} };
     34 static mmx_t MMX_FF00w    = { .ud = {0xff00ff00, 0xff00ff00} };
     35 
     36 static mmx_t MMX_Ycoeff   = { .uw = {0x004a, 0x004a, 0x004a, 0x004a} };
     37 
     38 static mmx_t MMX_UbluRGB  = { .uw = {0x0072, 0x0072, 0x0072, 0x0072} };
     39 static mmx_t MMX_VredRGB  = { .uw = {0x0059, 0x0059, 0x0059, 0x0059} };
     40 static mmx_t MMX_UgrnRGB  = { .uw = {0xffea, 0xffea, 0xffea, 0xffea} };
     41 static mmx_t MMX_VgrnRGB  = { .uw = {0xffd2, 0xffd2, 0xffd2, 0xffd2} };
     42 
     43 static mmx_t MMX_Ublu5x5  = { .uw = {0x0081, 0x0081, 0x0081, 0x0081} };
     44 static mmx_t MMX_Vred5x5  = { .uw = {0x0066, 0x0066, 0x0066, 0x0066} };
     45 static mmx_t MMX_Ugrn565  = { .uw = {0xffe8, 0xffe8, 0xffe8, 0xffe8} };
     46 static mmx_t MMX_Vgrn565  = { .uw = {0xffcd, 0xffcd, 0xffcd, 0xffcd} };
     47 
     48 static mmx_t MMX_red565   = { .uw = {0xf800, 0xf800, 0xf800, 0xf800} };
     49 static mmx_t MMX_grn565   = { .uw = {0x07e0, 0x07e0, 0x07e0, 0x07e0} };
     50 
     51 /**
     52    This MMX assembler is my first assembler/MMX program ever.
     53    Thus it maybe buggy.
     54    Send patches to:
     55    mvogt (at) rhrk.uni-kl.de
     56 
     57    After it worked fine I have "obfuscated" the code a bit to have
     58    more parallism in the MMX units. This means I moved
     59    initilisation around and delayed other instruction.
     60    Performance measurement did not show that this brought any advantage
     61    but in theory it _should_ be faster this way.
     62 
     63    The overall performanve gain to the C based dither was 30%-40%.
     64    The MMX routine calculates 256bit=8RGB values in each cycle
     65    (4 for row1 & 4 for row2)
     66 
     67    The red/green/blue.. coefficents are taken from the mpeg_play
     68    player. They look nice, but I dont know if you can have
     69    better values, to avoid integer rounding errors.
     70 
     71 
     72    IMPORTANT:
     73    ==========
     74 
     75    It is a requirement that the cr/cb/lum are 8 byte aligned and
     76    the out are 16byte aligned or you will/may get segfaults
     77 
     78 */
     79 
     80 void ColorRGBDitherYV12MMX1X( int *colortab, Uint32 *rgb_2_pix,
     81                               unsigned char *lum, unsigned char *cr,
     82                               unsigned char *cb, unsigned char *out,
     83                               int rows, int cols, int mod )
     84 {
     85 	Uint32 *row1;
     86 	Uint32 *row2;
     87 
     88 	unsigned char* y = lum +cols*rows;    // Pointer to the end
     89 	int x = 0;
     90 	row1 = (Uint32 *)out;                 // 32 bit target
     91 	row2 = (Uint32 *)out+cols+mod;        // start of second row
     92 	mod = (mod+cols+mod)*4;               // increment for row1 in byte
     93 
     94 	__asm__ __volatile__ (
     95 		// tap dance to workaround the inability to use %%ebx at will...
     96 		//  move one thing to the stack...
     97 		"pushl $0\n"  // save a slot on the stack.
     98 		"pushl %%ebx\n"  // save %%ebx.
     99 		"movl %0, %%ebx\n"  // put the thing in ebx.
    100 		"movl %%ebx,4(%%esp)\n"  // put the thing in the stack slot.
    101 		"popl %%ebx\n"  // get back %%ebx (the PIC register).
    102 
    103 		".align 8\n"
    104 		"1:\n"
    105 
    106 		// create Cr (result in mm1)
    107 		"pushl %%ebx\n"
    108 		"movl 4(%%esp),%%ebx\n"
    109 		"movd (%%ebx),%%mm1\n"   //         0  0  0  0  v3 v2 v1 v0
    110 		"popl %%ebx\n"
    111 		"pxor %%mm7,%%mm7\n"      //         00 00 00 00 00 00 00 00
    112 		"movd (%2), %%mm2\n"           //    0  0  0  0 l3 l2 l1 l0
    113 		"punpcklbw %%mm7,%%mm1\n" //         0  v3 0  v2 00 v1 00 v0
    114 		"punpckldq %%mm1,%%mm1\n" //         00 v1 00 v0 00 v1 00 v0
    115 		"psubw %9,%%mm1\n"        // mm1-128:r1 r1 r0 r0 r1 r1 r0 r0
    116 
    117 		 // create Cr_g (result in mm0)
    118 		"movq %%mm1,%%mm0\n"           // r1 r1 r0 r0 r1 r1 r0 r0
    119 		"pmullw %10,%%mm0\n"           // red*-46dec=0.7136*64
    120 		"pmullw %11,%%mm1\n"           // red*89dec=1.4013*64
    121 		"psraw  $6, %%mm0\n"           // red=red/64
    122 		"psraw  $6, %%mm1\n"           // red=red/64
    123 
    124 		// create L1 L2 (result in mm2,mm4)
    125 		// L2=lum+cols
    126 		"movq (%2,%4),%%mm3\n"         //    0  0  0  0 L3 L2 L1 L0
    127 		"punpckldq %%mm3,%%mm2\n"      //   L3 L2 L1 L0 l3 l2 l1 l0
    128 		"movq %%mm2,%%mm4\n"           //   L3 L2 L1 L0 l3 l2 l1 l0
    129 		"pand %12,%%mm2\n"             //   L3 0  L1  0 l3  0 l1  0
    130 		"pand %13,%%mm4\n"             //   0  L2  0 L0  0 l2  0 l0
    131 		"psrlw $8,%%mm2\n"             //   0  L3  0 L1  0 l3  0 l1
    132 
    133 		// create R (result in mm6)
    134 		"movq %%mm2,%%mm5\n"           //   0 L3  0 L1  0 l3  0 l1
    135 		"movq %%mm4,%%mm6\n"           //   0 L2  0 L0  0 l2  0 l0
    136 		"paddsw  %%mm1, %%mm5\n"       // lum1+red:x R3 x R1 x r3 x r1
    137 		"paddsw  %%mm1, %%mm6\n"       // lum1+red:x R2 x R0 x r2 x r0
    138 		"packuswb %%mm5,%%mm5\n"       //  R3 R1 r3 r1 R3 R1 r3 r1
    139 		"packuswb %%mm6,%%mm6\n"       //  R2 R0 r2 r0 R2 R0 r2 r0
    140 		"pxor %%mm7,%%mm7\n"      //         00 00 00 00 00 00 00 00
    141 		"punpcklbw %%mm5,%%mm6\n"      //  R3 R2 R1 R0 r3 r2 r1 r0
    142 
    143 		// create Cb (result in mm1)
    144 		"movd (%1), %%mm1\n"      //         0  0  0  0  u3 u2 u1 u0
    145 		"punpcklbw %%mm7,%%mm1\n" //         0  u3 0  u2 00 u1 00 u0
    146 		"punpckldq %%mm1,%%mm1\n" //         00 u1 00 u0 00 u1 00 u0
    147 		"psubw %9,%%mm1\n"        // mm1-128:u1 u1 u0 u0 u1 u1 u0 u0
    148 		// create Cb_g (result in mm5)
    149 		"movq %%mm1,%%mm5\n"            // u1 u1 u0 u0 u1 u1 u0 u0
    150 		"pmullw %14,%%mm5\n"            // blue*-109dec=1.7129*64
    151 		"pmullw %15,%%mm1\n"            // blue*114dec=1.78125*64
    152 		"psraw  $6, %%mm5\n"            // blue=red/64
    153 		"psraw  $6, %%mm1\n"            // blue=blue/64
    154 
    155 		// create G (result in mm7)
    156 		"movq %%mm2,%%mm3\n"      //   0  L3  0 L1  0 l3  0 l1
    157 		"movq %%mm4,%%mm7\n"      //   0  L2  0 L0  0 l2  0 l1
    158 		"paddsw  %%mm5, %%mm3\n"  // lum1+Cb_g:x G3t x G1t x g3t x g1t
    159 		"paddsw  %%mm5, %%mm7\n"  // lum1+Cb_g:x G2t x G0t x g2t x g0t
    160 		"paddsw  %%mm0, %%mm3\n"  // lum1+Cr_g:x G3  x G1  x g3  x g1
    161 		"paddsw  %%mm0, %%mm7\n"  // lum1+blue:x G2  x G0  x g2  x g0
    162 		"packuswb %%mm3,%%mm3\n"  // G3 G1 g3 g1 G3 G1 g3 g1
    163 		"packuswb %%mm7,%%mm7\n"  // G2 G0 g2 g0 G2 G0 g2 g0
    164 		"punpcklbw %%mm3,%%mm7\n" // G3 G2 G1 G0 g3 g2 g1 g0
    165 
    166 		// create B (result in mm5)
    167 		"movq %%mm2,%%mm3\n"         //   0  L3  0 L1  0 l3  0 l1
    168 		"movq %%mm4,%%mm5\n"         //   0  L2  0 L0  0 l2  0 l1
    169 		"paddsw  %%mm1, %%mm3\n"     // lum1+blue:x B3 x B1 x b3 x b1
    170 		"paddsw  %%mm1, %%mm5\n"     // lum1+blue:x B2 x B0 x b2 x b0
    171 		"packuswb %%mm3,%%mm3\n"     // B3 B1 b3 b1 B3 B1 b3 b1
    172 		"packuswb %%mm5,%%mm5\n"     // B2 B0 b2 b0 B2 B0 b2 b0
    173 		"punpcklbw %%mm3,%%mm5\n"    // B3 B2 B1 B0 b3 b2 b1 b0
    174 
    175 		// fill destination row1 (needed are mm6=Rr,mm7=Gg,mm5=Bb)
    176 
    177 		"pxor %%mm2,%%mm2\n"           //  0  0  0  0  0  0  0  0
    178 		"pxor %%mm4,%%mm4\n"           //  0  0  0  0  0  0  0  0
    179 		"movq %%mm6,%%mm1\n"           // R3 R2 R1 R0 r3 r2 r1 r0
    180 		"movq %%mm5,%%mm3\n"           // B3 B2 B1 B0 b3 b2 b1 b0
    181 		// process lower lum
    182 		"punpcklbw %%mm4,%%mm1\n"      //  0 r3  0 r2  0 r1  0 r0
    183 		"punpcklbw %%mm4,%%mm3\n"      //  0 b3  0 b2  0 b1  0 b0
    184 		"movq %%mm1,%%mm2\n"           //  0 r3  0 r2  0 r1  0 r0
    185 		"movq %%mm3,%%mm0\n"           //  0 b3  0 b2  0 b1  0 b0
    186 		"punpcklwd %%mm1,%%mm3\n"      //  0 r1  0 b1  0 r0  0 b0
    187 		"punpckhwd %%mm2,%%mm0\n"      //  0 r3  0 b3  0 r2  0 b2
    188 
    189 		"pxor %%mm2,%%mm2\n"           //  0  0  0  0  0  0  0  0
    190 		"movq %%mm7,%%mm1\n"           // G3 G2 G1 G0 g3 g2 g1 g0
    191 		"punpcklbw %%mm1,%%mm2\n"      // g3  0 g2  0 g1  0 g0  0
    192 		"punpcklwd %%mm4,%%mm2\n"      //  0  0 g1  0  0  0 g0  0
    193 		"por %%mm3, %%mm2\n"          //  0 r1 g1 b1  0 r0 g0 b0
    194 		"movq %%mm2,(%3)\n"          // wrote out ! row1
    195 
    196 		"pxor %%mm2,%%mm2\n"           //  0  0  0  0  0  0  0  0
    197 		"punpcklbw %%mm1,%%mm4\n"      // g3  0 g2  0 g1  0 g0  0
    198 		"punpckhwd %%mm2,%%mm4\n"      //  0  0 g3  0  0  0 g2  0
    199 		"por %%mm0, %%mm4\n"          //  0 r3 g3 b3  0 r2 g2 b2
    200 		"movq %%mm4,8(%3)\n"         // wrote out ! row1
    201 
    202 		// fill destination row2 (needed are mm6=Rr,mm7=Gg,mm5=Bb)
    203 		// this can be done "destructive"
    204 		"pxor %%mm2,%%mm2\n"           //  0  0  0  0  0  0  0  0
    205 		"punpckhbw %%mm2,%%mm6\n"      //  0 R3  0 R2  0 R1  0 R0
    206 		"punpckhbw %%mm1,%%mm5\n"      // G3 B3 G2 B2 G1 B1 G0 B0
    207 		"movq %%mm5,%%mm1\n"           // G3 B3 G2 B2 G1 B1 G0 B0
    208 		"punpcklwd %%mm6,%%mm1\n"      //  0 R1 G1 B1  0 R0 G0 B0
    209 		"movq %%mm1,(%5)\n"          // wrote out ! row2
    210 		"punpckhwd %%mm6,%%mm5\n"      //  0 R3 G3 B3  0 R2 G2 B2
    211 		"movq %%mm5,8(%5)\n"         // wrote out ! row2
    212 
    213 		"addl $4,%2\n"            // lum+4
    214 		"leal 16(%3),%3\n"        // row1+16
    215 		"leal 16(%5),%5\n"        // row2+16
    216 		"addl $2,(%%esp)\n"        // cr+2
    217 		"addl $2,%1\n"           // cb+2
    218 
    219 		"addl $4,%6\n"            // x+4
    220 		"cmpl %4,%6\n"
    221 
    222 		"jl 1b\n"
    223 		"addl %4,%2\n" // lum += cols
    224 		"addl %8,%3\n" // row1+= mod
    225 		"addl %8,%5\n" // row2+= mod
    226 		"movl $0,%6\n" // x=0
    227 		"cmpl %7,%2\n"
    228 		"jl 1b\n"
    229 
    230 		"addl $4,%%esp\n"  // get rid of the stack slot we reserved.
    231 		"emms\n"  // reset MMX registers.
    232 		:
    233 		: "m" (cr), "r"(cb),"r"(lum),
    234 		  "r"(row1),"r"(cols),"r"(row2),"m"(x),"m"(y),"m"(mod),
    235 		  "m"(MMX_0080w),"m"(MMX_VgrnRGB),"m"(MMX_VredRGB),
    236 		  "m"(MMX_FF00w),"m"(MMX_00FFw),"m"(MMX_UgrnRGB),
    237 		  "m"(MMX_UbluRGB)
    238 	);
    239 }
    240 
    241 void Color565DitherYV12MMX1X( int *colortab, Uint32 *rgb_2_pix,
    242                              unsigned char *lum, unsigned char *cr,
    243                              unsigned char *cb, unsigned char *out,
    244                              int rows, int cols, int mod )
    245 {
    246 	Uint16 *row1;
    247 	Uint16 *row2;
    248 
    249 	unsigned char* y = lum +cols*rows;    /* Pointer to the end */
    250 	int x = 0;
    251 	row1 = (Uint16 *)out;                 /* 16 bit target */
    252 	row2 = (Uint16 *)out+cols+mod;        /* start of second row  */
    253 	mod = (mod+cols+mod)*2;               /* increment for row1 in byte */
    254 
    255 	__asm__ __volatile__(
    256 		// tap dance to workaround the inability to use %%ebx at will...
    257 		//  move one thing to the stack...
    258 		"pushl $0\n"  // save a slot on the stack.
    259 		"pushl %%ebx\n"  // save %%ebx.
    260 		"movl %0, %%ebx\n"  // put the thing in ebx.
    261 		"movl %%ebx, 4(%%esp)\n"  // put the thing in the stack slot.
    262 		"popl %%ebx\n"  // get back %%ebx (the PIC register).
    263 
    264 		".align 8\n"
    265 		"1:\n"
    266 		"movd           (%1),                   %%mm0\n" // 4 Cb         0  0  0  0 u3 u2 u1 u0
    267 		"pxor           %%mm7,                  %%mm7\n"
    268 		"pushl %%ebx\n"
    269 		"movl 4(%%esp), %%ebx\n"
    270 		"movd (%%ebx), %%mm1\n"   // 4 Cr                0  0  0  0 v3 v2 v1 v0
    271 		"popl %%ebx\n"
    272 
    273 		"punpcklbw      %%mm7,                  %%mm0\n" // 4 W cb   0 u3  0 u2  0 u1  0 u0
    274 		"punpcklbw      %%mm7,                  %%mm1\n" // 4 W cr   0 v3  0 v2  0 v1  0 v0
    275 		"psubw          %9,                     %%mm0\n"
    276 		"psubw          %9,                     %%mm1\n"
    277 		"movq           %%mm0,                  %%mm2\n" // Cb                   0 u3  0 u2  0 u1  0 u0
    278 		"movq           %%mm1,                  %%mm3\n" // Cr
    279 		"pmullw         %10,                    %%mm2\n" // Cb2green 0 R3  0 R2  0 R1  0 R0
    280 		"movq           (%2),                   %%mm6\n" // L1      l7 L6 L5 L4 L3 L2 L1 L0
    281 		"pmullw         %11,                    %%mm0\n" // Cb2blue
    282 		"pand           %12,                    %%mm6\n" // L1      00 L6 00 L4 00 L2 00 L0
    283 		"pmullw         %13,                    %%mm3\n" // Cr2green
    284 		"movq           (%2),                   %%mm7\n" // L2
    285 		"pmullw         %14,                    %%mm1\n" // Cr2red
    286 		"psrlw          $8,                     %%mm7\n"        // L2           00 L7 00 L5 00 L3 00 L1
    287 		"pmullw         %15,                    %%mm6\n" // lum1
    288 		"paddw          %%mm3,                  %%mm2\n" // Cb2green + Cr2green == green
    289 		"pmullw         %15,                    %%mm7\n" // lum2
    290 
    291 		"movq           %%mm6,                  %%mm4\n" // lum1
    292 		"paddw          %%mm0,                  %%mm6\n" // lum1 +blue 00 B6 00 B4 00 B2 00 B0
    293 		"movq           %%mm4,                  %%mm5\n" // lum1
    294 		"paddw          %%mm1,                  %%mm4\n" // lum1 +red  00 R6 00 R4 00 R2 00 R0
    295 		"paddw          %%mm2,                  %%mm5\n" // lum1 +green 00 G6 00 G4 00 G2 00 G0
    296 		"psraw          $6,                     %%mm4\n" // R1 0 .. 64
    297 		"movq           %%mm7,                  %%mm3\n" // lum2                       00 L7 00 L5 00 L3 00 L1
    298 		"psraw          $6,                     %%mm5\n" // G1  - .. +
    299 		"paddw          %%mm0,                  %%mm7\n" // Lum2 +blue 00 B7 00 B5 00 B3 00 B1
    300 		"psraw          $6,                     %%mm6\n" // B1         0 .. 64
    301 		"packuswb       %%mm4,                  %%mm4\n" // R1 R1
    302 		"packuswb       %%mm5,                  %%mm5\n" // G1 G1
    303 		"packuswb       %%mm6,                  %%mm6\n" // B1 B1
    304 		"punpcklbw      %%mm4,                  %%mm4\n"
    305 		"punpcklbw      %%mm5,                  %%mm5\n"
    306 
    307 		"pand           %16,                    %%mm4\n"
    308 		"psllw          $3,                     %%mm5\n" // GREEN       1
    309 		"punpcklbw      %%mm6,                  %%mm6\n"
    310 		"pand           %17,                    %%mm5\n"
    311 		"pand           %16,                    %%mm6\n"
    312 		"por            %%mm5,                  %%mm4\n" //
    313 		"psrlw          $11,                    %%mm6\n" // BLUE        1
    314 		"movq           %%mm3,                  %%mm5\n" // lum2
    315 		"paddw          %%mm1,                  %%mm3\n" // lum2 +red      00 R7 00 R5 00 R3 00 R1
    316 		"paddw          %%mm2,                  %%mm5\n" // lum2 +green 00 G7 00 G5 00 G3 00 G1
    317 		"psraw          $6,                     %%mm3\n" // R2
    318 		"por            %%mm6,                  %%mm4\n" // MM4
    319 		"psraw          $6,                     %%mm5\n" // G2
    320 		"movq           (%2, %4),               %%mm6\n" // L3 load lum2
    321 		"psraw          $6,                     %%mm7\n"
    322 		"packuswb       %%mm3,                  %%mm3\n"
    323 		"packuswb       %%mm5,                  %%mm5\n"
    324 		"packuswb       %%mm7,                  %%mm7\n"
    325 		"pand           %12,                    %%mm6\n" // L3
    326 		"punpcklbw      %%mm3,                  %%mm3\n"
    327 		"punpcklbw      %%mm5,                  %%mm5\n"
    328 		"pmullw         %15,                    %%mm6\n" // lum3
    329 		"punpcklbw      %%mm7,                  %%mm7\n"
    330 		"psllw          $3,                     %%mm5\n" // GREEN 2
    331 		"pand           %16,                    %%mm7\n"
    332 		"pand           %16,                    %%mm3\n"
    333 		"psrlw          $11,                    %%mm7\n" // BLUE  2
    334 		"pand           %17,                    %%mm5\n"
    335 		"por            %%mm7,                  %%mm3\n"
    336 		"movq           (%2,%4),                %%mm7\n" // L4 load lum2
    337 		"por            %%mm5,                  %%mm3\n" //
    338 		"psrlw          $8,                     %%mm7\n" // L4
    339 		"movq           %%mm4,                  %%mm5\n"
    340 		"punpcklwd      %%mm3,                  %%mm4\n"
    341 		"pmullw         %15,                    %%mm7\n" // lum4
    342 		"punpckhwd      %%mm3,                  %%mm5\n"
    343 
    344 		"movq           %%mm4,                  (%3)\n"  // write row1
    345 		"movq           %%mm5,                  8(%3)\n" // write row1
    346 
    347 		"movq           %%mm6,                  %%mm4\n" // Lum3
    348 		"paddw          %%mm0,                  %%mm6\n" // Lum3 +blue
    349 
    350 		"movq           %%mm4,                  %%mm5\n" // Lum3
    351 		"paddw          %%mm1,                  %%mm4\n" // Lum3 +red
    352 		"paddw          %%mm2,                  %%mm5\n" // Lum3 +green
    353 		"psraw          $6,                     %%mm4\n"
    354 		"movq           %%mm7,                  %%mm3\n" // Lum4
    355 		"psraw          $6,                     %%mm5\n"
    356 		"paddw          %%mm0,                  %%mm7\n" // Lum4 +blue
    357 		"psraw          $6,                     %%mm6\n" // Lum3 +blue
    358 		"movq           %%mm3,                  %%mm0\n" // Lum4
    359 		"packuswb       %%mm4,                  %%mm4\n"
    360 		"paddw          %%mm1,                  %%mm3\n" // Lum4 +red
    361 		"packuswb       %%mm5,                  %%mm5\n"
    362 		"paddw          %%mm2,                  %%mm0\n" // Lum4 +green
    363 		"packuswb       %%mm6,                  %%mm6\n"
    364 		"punpcklbw      %%mm4,                  %%mm4\n"
    365 		"punpcklbw      %%mm5,                  %%mm5\n"
    366 		"punpcklbw      %%mm6,                  %%mm6\n"
    367 		"psllw          $3,                     %%mm5\n" // GREEN 3
    368 		"pand           %16,                    %%mm4\n"
    369 		"psraw          $6,                     %%mm3\n" // psr 6
    370 		"psraw          $6,                     %%mm0\n"
    371 		"pand           %16,                    %%mm6\n" // BLUE
    372 		"pand           %17,                    %%mm5\n"
    373 		"psrlw          $11,                    %%mm6\n" // BLUE  3
    374 		"por            %%mm5,                  %%mm4\n"
    375 		"psraw          $6,                     %%mm7\n"
    376 		"por            %%mm6,                  %%mm4\n"
    377 		"packuswb       %%mm3,                  %%mm3\n"
    378 		"packuswb       %%mm0,                  %%mm0\n"
    379 		"packuswb       %%mm7,                  %%mm7\n"
    380 		"punpcklbw      %%mm3,                  %%mm3\n"
    381 		"punpcklbw      %%mm0,                  %%mm0\n"
    382 		"punpcklbw      %%mm7,                  %%mm7\n"
    383 		"pand           %16,                    %%mm3\n"
    384 		"pand           %16,                    %%mm7\n" // BLUE
    385 		"psllw          $3,                     %%mm0\n" // GREEN 4
    386 		"psrlw          $11,                    %%mm7\n"
    387 		"pand           %17,                    %%mm0\n"
    388 		"por            %%mm7,                  %%mm3\n"
    389 		"por            %%mm0,                  %%mm3\n"
    390 
    391 		"movq           %%mm4,                  %%mm5\n"
    392 
    393 		"punpcklwd      %%mm3,                  %%mm4\n"
    394 		"punpckhwd      %%mm3,                  %%mm5\n"
    395 
    396 		"movq           %%mm4,                  (%5)\n"
    397 		"movq           %%mm5,                  8(%5)\n"
    398 
    399 		"addl           $8,                     %6\n"
    400 		"addl           $8,                     %2\n"
    401 		"addl           $4,                     (%%esp)\n"
    402 		"addl           $4,                     %1\n"
    403 		"cmpl           %4,                     %6\n"
    404 		"leal           16(%3),                 %3\n"
    405 		"leal           16(%5),%5\n" // row2+16
    406 
    407 		"jl             1b\n"
    408 		"addl           %4,     %2\n" // lum += cols
    409 		"addl           %8,     %3\n" // row1+= mod
    410 		"addl           %8,     %5\n" // row2+= mod
    411 		"movl           $0,     %6\n" // x=0
    412 		"cmpl           %7,     %2\n"
    413 		"jl             1b\n"
    414 		"addl $4, %%esp\n"  // get rid of the stack slot we reserved.
    415 		"emms\n"
    416 		:
    417 		: "m" (cr), "r"(cb),"r"(lum),
    418 		  "r"(row1),"r"(cols),"r"(row2),"m"(x),"m"(y),"m"(mod),
    419 		  "m"(MMX_0080w),"m"(MMX_Ugrn565),"m"(MMX_Ublu5x5),
    420 		  "m"(MMX_00FFw),"m"(MMX_Vgrn565),"m"(MMX_Vred5x5),
    421 		  "m"(MMX_Ycoeff),"m"(MMX_red565),"m"(MMX_grn565)
    422 	);
    423 }
    424 
    425 /* *INDENT-ON* */
    426 
    427 #endif /* GCC3 i386 inline assembly */
    428 
    429