WebSVN – Kolibri OS – Blame – /contrib/sdk/sources/SDL-1.2.2/src/video/SDL_yuv_mmx.c

Rev	Author	Line No.	Line
5131	clevermous	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
		24
		25	#if defined(i386) && defined(__GNUC__) && defined(USE_ASMBLIT)
		26
		27	#include "SDL_types.h"
		28
		29	#ifdef __ELF__
		30	#define ASM_VAR(X) _##X
		31	#else
		32	#define ASM_VAR(X) X
		33	#endif
		34
		35	#define static
		36	static unsigned int ASM_VAR(MMX_0080w)[] = {0x00800080, 0x00800080};
		37	static unsigned int ASM_VAR(MMX_00FFw)[] = {0x00ff00ff, 0x00ff00ff};
		38	static unsigned int ASM_VAR(MMX_FF00w)[] = {0xff00ff00, 0xff00ff00};
		39
		40	static unsigned short ASM_VAR(MMX_Ycoeff)[] = {0x004a, 0x004a, 0x004a, 0x004a};
		41
		42	static unsigned short ASM_VAR(MMX_UbluRGB)[] = {0x0072, 0x0072, 0x0072, 0x0072};
		43	static unsigned short ASM_VAR(MMX_VredRGB)[] = {0x0059, 0x0059, 0x0059, 0x0059};
		44	static unsigned short ASM_VAR(MMX_UgrnRGB)[] = {0xffea, 0xffea, 0xffea, 0xffea};
		45	static unsigned short ASM_VAR(MMX_VgrnRGB)[] = {0xffd2, 0xffd2, 0xffd2, 0xffd2};
		46
		47	static unsigned short ASM_VAR(MMX_Ublu5x5)[] = {0x0081, 0x0081, 0x0081, 0x0081};
		48	static unsigned short ASM_VAR(MMX_Vred5x5)[] = {0x0066, 0x0066, 0x0066, 0x0066};
		49	static unsigned short ASM_VAR(MMX_Ugrn555)[] = {0xffe7, 0xffe7, 0xffe7, 0xffe7};
		50	static unsigned short ASM_VAR(MMX_Vgrn555)[] = {0xffcc, 0xffcc, 0xffcc, 0xffcc};
		51	static unsigned short ASM_VAR(MMX_Ugrn565)[] = {0xffe8, 0xffe8, 0xffe8, 0xffe8};
		52	static unsigned short ASM_VAR(MMX_Vgrn565)[] = {0xffcd, 0xffcd, 0xffcd, 0xffcd};
		53
		54	static unsigned short ASM_VAR(MMX_red555)[] = {0x7c00, 0x7c00, 0x7c00, 0x7c00};
		55	static unsigned short ASM_VAR(MMX_red565)[] = {0xf800, 0xf800, 0xf800, 0xf800};
		56	static unsigned short ASM_VAR(MMX_grn555)[] = {0x03e0, 0x03e0, 0x03e0, 0x03e0};
		57	static unsigned short ASM_VAR(MMX_grn565)[] = {0x07e0, 0x07e0, 0x07e0, 0x07e0};
		58	static unsigned short ASM_VAR(MMX_blu5x5)[] = {0x001f, 0x001f, 0x001f, 0x001f};
		59
		60	/**
		61	This MMX assembler is my first assembler/MMX program ever.
		62	Thus it maybe buggy.
		63	Send patches to:
		64	mvogt@rhrk.uni-kl.de
		65
		66	After it worked fine I have "obfuscated" the code a bit to have
		67	more parallism in the MMX units. This means I moved
		68	initilisation around and delayed other instruction.
		69	Performance measurement did not show that this brought any advantage
		70	but in theory it _should_ be faster this way.
		71
		72	The overall performanve gain to the C based dither was 30%-40%.
		73	The MMX routine calculates 256bit=8RGB values in each cycle
		74	(4 for row1 & 4 for row2)
		75
		76	The red/green/blue.. coefficents are taken from the mpeg_play
		77	player. They look nice, but I dont know if you can have
		78	better values, to avoid integer rounding errors.
		79
		80
		81	IMPORTANT:
		82	==========
		83
		84	It is a requirement that the cr/cb/lum are 8 byte aligned and
		85	the out are 16byte aligned or you will/may get segfaults
		86
		87	*/
		88
		89	void ColorRGBDitherYV12MMX1X( int colortab, Uint32 rgb_2_pix,
		90	unsigned char lum, unsigned char cr,
		91	unsigned char cb, unsigned char out,
		92	int rows, int cols, int mod )
		93	{
		94	Uint32 *row1;
		95	Uint32 *row2;
		96
		97	unsigned char* y = lum +cols*rows; // Pointer to the end
		98	int x=0;
		99	row1 = (Uint32 *)out; // 32 bit target
		100	row2 = (Uint32 *)out+cols+mod; // start of second row
		101	mod = (mod+cols+mod)*4; // increment for row1 in byte
		102
		103	__asm__ __volatile__ (
		104	/* We don't really care about PIC - the code should be rewritten to use
		105	relative addressing for the static tables, so right now we take the
		106	COW hit on the pages this code resides. Big deal.
		107	This spill is just to reduce register pressure in the PIC case. */
		108	"pushl %%ebx\n"
		109	"movl %0, %%ebx\n"
		110
		111	".align 8\n"
		112	"1:\n"
		113
		114	// create Cr (result in mm1)
		115	"movd (%%ebx), %%mm1\n" // 0 0 0 0 v3 v2 v1 v0
		116	"pxor %%mm7,%%mm7\n" // 00 00 00 00 00 00 00 00
		117	"movd (%2), %%mm2\n" // 0 0 0 0 l3 l2 l1 l0
		118	"punpcklbw %%mm7,%%mm1\n" // 0 v3 0 v2 00 v1 00 v0
		119	"punpckldq %%mm1,%%mm1\n" // 00 v1 00 v0 00 v1 00 v0
		120	"psubw _MMX_0080w,%%mm1\n" // mm1-128:r1 r1 r0 r0 r1 r1 r0 r0
		121
		122	// create Cr_g (result in mm0)
		123	"movq %%mm1,%%mm0\n" // r1 r1 r0 r0 r1 r1 r0 r0
		124	"pmullw _MMX_VgrnRGB,%%mm0\n"// red-46dec=0.713664
		125	"pmullw _MMX_VredRGB,%%mm1\n"// red89dec=1.401364
		126	"psraw $6, %%mm0\n" // red=red/64
		127	"psraw $6, %%mm1\n" // red=red/64
		128
		129	// create L1 L2 (result in mm2,mm4)
		130	// L2=lum+cols
		131	"movq (%2,%4),%%mm3\n" // 0 0 0 0 L3 L2 L1 L0
		132	"punpckldq %%mm3,%%mm2\n" // L3 L2 L1 L0 l3 l2 l1 l0
		133	"movq %%mm2,%%mm4\n" // L3 L2 L1 L0 l3 l2 l1 l0
		134	"pand _MMX_FF00w,%%mm2\n" // L3 0 L1 0 l3 0 l1 0
		135	"pand _MMX_00FFw,%%mm4\n" // 0 L2 0 L0 0 l2 0 l0
		136	"psrlw $8,%%mm2\n" // 0 L3 0 L1 0 l3 0 l1
		137
		138	// create R (result in mm6)
		139	"movq %%mm2,%%mm5\n" // 0 L3 0 L1 0 l3 0 l1
		140	"movq %%mm4,%%mm6\n" // 0 L2 0 L0 0 l2 0 l0
		141	"paddsw %%mm1, %%mm5\n" // lum1+red:x R3 x R1 x r3 x r1
		142	"paddsw %%mm1, %%mm6\n" // lum1+red:x R2 x R0 x r2 x r0
		143	"packuswb %%mm5,%%mm5\n" // R3 R1 r3 r1 R3 R1 r3 r1
		144	"packuswb %%mm6,%%mm6\n" // R2 R0 r2 r0 R2 R0 r2 r0
		145	"pxor %%mm7,%%mm7\n" // 00 00 00 00 00 00 00 00
		146	"punpcklbw %%mm5,%%mm6\n" // R3 R2 R1 R0 r3 r2 r1 r0
		147
		148	// create Cb (result in mm1)
		149	"movd (%1), %%mm1\n" // 0 0 0 0 u3 u2 u1 u0
		150	"punpcklbw %%mm7,%%mm1\n" // 0 u3 0 u2 00 u1 00 u0
		151	"punpckldq %%mm1,%%mm1\n" // 00 u1 00 u0 00 u1 00 u0
		152	"psubw _MMX_0080w,%%mm1\n" // mm1-128:u1 u1 u0 u0 u1 u1 u0 u0
		153	// create Cb_g (result in mm5)
		154	"movq %%mm1,%%mm5\n" // u1 u1 u0 u0 u1 u1 u0 u0
		155	"pmullw _MMX_UgrnRGB,%%mm5\n" // blue-109dec=1.712964
		156	"pmullw _MMX_UbluRGB,%%mm1\n" // blue114dec=1.7812564
		157	"psraw $6, %%mm5\n" // blue=red/64
		158	"psraw $6, %%mm1\n" // blue=blue/64
		159
		160	// create G (result in mm7)
		161	"movq %%mm2,%%mm3\n" // 0 L3 0 L1 0 l3 0 l1
		162	"movq %%mm4,%%mm7\n" // 0 L2 0 L0 0 l2 0 l1
		163	"paddsw %%mm5, %%mm3\n" // lum1+Cb_g:x G3t x G1t x g3t x g1t
		164	"paddsw %%mm5, %%mm7\n" // lum1+Cb_g:x G2t x G0t x g2t x g0t
		165	"paddsw %%mm0, %%mm3\n" // lum1+Cr_g:x G3 x G1 x g3 x g1
		166	"paddsw %%mm0, %%mm7\n" // lum1+blue:x G2 x G0 x g2 x g0
		167	"packuswb %%mm3,%%mm3\n" // G3 G1 g3 g1 G3 G1 g3 g1
		168	"packuswb %%mm7,%%mm7\n" // G2 G0 g2 g0 G2 G0 g2 g0
		169	"punpcklbw %%mm3,%%mm7\n" // G3 G2 G1 G0 g3 g2 g1 g0
		170
		171	// create B (result in mm5)
		172	"movq %%mm2,%%mm3\n" // 0 L3 0 L1 0 l3 0 l1
		173	"movq %%mm4,%%mm5\n" // 0 L2 0 L0 0 l2 0 l1
		174	"paddsw %%mm1, %%mm3\n" // lum1+blue:x B3 x B1 x b3 x b1
		175	"paddsw %%mm1, %%mm5\n" // lum1+blue:x B2 x B0 x b2 x b0
		176	"packuswb %%mm3,%%mm3\n" // B3 B1 b3 b1 B3 B1 b3 b1
		177	"packuswb %%mm5,%%mm5\n" // B2 B0 b2 b0 B2 B0 b2 b0
		178	"punpcklbw %%mm3,%%mm5\n" // B3 B2 B1 B0 b3 b2 b1 b0
		179
		180	// fill destination row1 (needed are mm6=Rr,mm7=Gg,mm5=Bb)
		181
		182	"pxor %%mm2,%%mm2\n" // 0 0 0 0 0 0 0 0
		183	"pxor %%mm4,%%mm4\n" // 0 0 0 0 0 0 0 0
		184	"movq %%mm6,%%mm1\n" // R3 R2 R1 R0 r3 r2 r1 r0
		185	"movq %%mm5,%%mm3\n" // B3 B2 B1 B0 b3 b2 b1 b0
		186	// process lower lum
		187	"punpcklbw %%mm4,%%mm1\n" // 0 r3 0 r2 0 r1 0 r0
		188	"punpcklbw %%mm4,%%mm3\n" // 0 b3 0 b2 0 b1 0 b0
		189	"movq %%mm1,%%mm2\n" // 0 r3 0 r2 0 r1 0 r0
		190	"movq %%mm3,%%mm0\n" // 0 b3 0 b2 0 b1 0 b0
		191	"punpcklwd %%mm1,%%mm3\n" // 0 r1 0 b1 0 r0 0 b0
		192	"punpckhwd %%mm2,%%mm0\n" // 0 r3 0 b3 0 r2 0 b2
		193
		194	"pxor %%mm2,%%mm2\n" // 0 0 0 0 0 0 0 0
		195	"movq %%mm7,%%mm1\n" // G3 G2 G1 G0 g3 g2 g1 g0
		196	"punpcklbw %%mm1,%%mm2\n" // g3 0 g2 0 g1 0 g0 0
		197	"punpcklwd %%mm4,%%mm2\n" // 0 0 g1 0 0 0 g0 0
		198	"por %%mm3, %%mm2\n" // 0 r1 g1 b1 0 r0 g0 b0
		199	"movq %%mm2,(%3)\n" // wrote out ! row1
		200
		201	"pxor %%mm2,%%mm2\n" // 0 0 0 0 0 0 0 0
		202	"punpcklbw %%mm1,%%mm4\n" // g3 0 g2 0 g1 0 g0 0
		203	"punpckhwd %%mm2,%%mm4\n" // 0 0 g3 0 0 0 g2 0
		204	"por %%mm0, %%mm4\n" // 0 r3 g3 b3 0 r2 g2 b2
		205	"movq %%mm4,8(%3)\n" // wrote out ! row1
		206
		207	// fill destination row2 (needed are mm6=Rr,mm7=Gg,mm5=Bb)
		208	// this can be done "destructive"
		209	"pxor %%mm2,%%mm2\n" // 0 0 0 0 0 0 0 0
		210	"punpckhbw %%mm2,%%mm6\n" // 0 R3 0 R2 0 R1 0 R0
		211	"punpckhbw %%mm1,%%mm5\n" // G3 B3 G2 B2 G1 B1 G0 B0
		212	"movq %%mm5,%%mm1\n" // G3 B3 G2 B2 G1 B1 G0 B0
		213	"punpcklwd %%mm6,%%mm1\n" // 0 R1 G1 B1 0 R0 G0 B0
		214	"movq %%mm1,(%5)\n" // wrote out ! row2
		215	"punpckhwd %%mm6,%%mm5\n" // 0 R3 G3 B3 0 R2 G2 B2
		216	"movq %%mm5,8(%5)\n" // wrote out ! row2
		217
		218	"addl $4,%2\n" // lum+4
		219	"leal 16(%3),%3\n" // row1+16
		220	"leal 16(%5),%5\n" // row2+16
		221	"addl $2, %%ebx\n" // cr+2
		222	"addl $2, %1\n" // cb+2
		223
		224	"addl $4,%6\n" // x+4
		225	"cmpl %4,%6\n"
		226
		227	"jl 1b\n"
		228	"addl %4, %2\n" // lum += cols
		229	"addl %8, %3\n" // row1+= mod
		230	"addl %8, %5\n" // row2+= mod
		231	"movl $0, %6\n" // x=0
		232	"cmpl %7, %2\n"
		233	"jl 1b\n"
		234	"emms\n"
		235	"popl %%ebx\n"
		236	:
		237	: "m" (cr), "r"(cb),"r"(lum),
		238	"r"(row1),"r"(cols),"r"(row2),"m"(x),"m"(y),"m"(mod)
		239	: "%ebx"
		240	);
		241	}
		242
		243	void Color565DitherYV12MMX1X( int colortab, Uint32 rgb_2_pix,
		244	unsigned char lum, unsigned char cr,
		245	unsigned char cb, unsigned char out,
		246	int rows, int cols, int mod )
		247	{
		248	Uint16 *row1;
		249	Uint16 *row2;
		250
		251	unsigned char* y = lum +colsrows; / Pointer to the end */
		252	int x=0;
		253	row1 = (Uint16 )out; / 16 bit target */
		254	row2 = (Uint16 )out+cols+mod; / start of second row */
		255	mod = (mod+cols+mod)2; / increment for row1 in byte */
		256
		257
		258	__asm__ __volatile__(
		259	"pushl %%ebx\n"
		260	"movl %0, %%ebx\n"
		261
		262	".align 8\n"
		263	"1:\n"
		264	"movd (%1), %%mm0\n" // 4 Cb 0 0 0 0 u3 u2 u1 u0
		265	"pxor %%mm7, %%mm7\n"
		266	"movd (%%ebx), %%mm1\n" // 4 Cr 0 0 0 0 v3 v2 v1 v0
		267	"punpcklbw %%mm7, %%mm0\n" // 4 W cb 0 u3 0 u2 0 u1 0 u0
		268	"punpcklbw %%mm7, %%mm1\n" // 4 W cr 0 v3 0 v2 0 v1 0 v0
		269	"psubw _MMX_0080w, %%mm0\n"
		270	"psubw _MMX_0080w, %%mm1\n"
		271	"movq %%mm0, %%mm2\n" // Cb 0 u3 0 u2 0 u1 0 u0
		272	"movq %%mm1, %%mm3\n" // Cr
		273	"pmullw _MMX_Ugrn565, %%mm2\n" // Cb2green 0 R3 0 R2 0 R1 0 R0
		274	"movq (%2), %%mm6\n" // L1 l7 L6 L5 L4 L3 L2 L1 L0
		275	"pmullw _MMX_Ublu5x5, %%mm0\n" // Cb2blue
		276	"pand _MMX_00FFw, %%mm6\n" // L1 00 L6 00 L4 00 L2 00 L0
		277	"pmullw _MMX_Vgrn565, %%mm3\n" // Cr2green
		278	"movq (%2), %%mm7\n" // L2
		279	"pmullw _MMX_Vred5x5, %%mm1\n" // Cr2red
		280	"psrlw $8, %%mm7\n" // L2 00 L7 00 L5 00 L3 00 L1
		281	"pmullw _MMX_Ycoeff, %%mm6\n" // lum1
		282	"paddw %%mm3, %%mm2\n" // Cb2green + Cr2green == green
		283	"pmullw _MMX_Ycoeff, %%mm7\n" // lum2
		284
		285	"movq %%mm6, %%mm4\n" // lum1
		286	"paddw %%mm0, %%mm6\n" // lum1 +blue 00 B6 00 B4 00 B2 00 B0
		287	"movq %%mm4, %%mm5\n" // lum1
		288	"paddw %%mm1, %%mm4\n" // lum1 +red 00 R6 00 R4 00 R2 00 R0
		289	"paddw %%mm2, %%mm5\n" // lum1 +green 00 G6 00 G4 00 G2 00 G0
		290	"psraw $6, %%mm4\n" // R1 0 .. 64
		291	"movq %%mm7, %%mm3\n" // lum2 00 L7 00 L5 00 L3 00 L1
		292	"psraw $6, %%mm5\n" // G1 - .. +
		293	"paddw %%mm0, %%mm7\n" // Lum2 +blue 00 B7 00 B5 00 B3 00 B1
		294	"psraw $6, %%mm6\n" // B1 0 .. 64
		295	"packuswb %%mm4, %%mm4\n" // R1 R1
		296	"packuswb %%mm5, %%mm5\n" // G1 G1
		297	"packuswb %%mm6, %%mm6\n" // B1 B1
		298	"punpcklbw %%mm4, %%mm4\n"
		299	"punpcklbw %%mm5, %%mm5\n"
		300
		301	"pand _MMX_red565, %%mm4\n"
		302	"psllw $3, %%mm5\n" // GREEN 1
		303	"punpcklbw %%mm6, %%mm6\n"
		304	"pand _MMX_grn565, %%mm5\n"
		305	"pand _MMX_red565, %%mm6\n"
		306	"por %%mm5, %%mm4\n" //
		307	"psrlw $11, %%mm6\n" // BLUE 1
		308	"movq %%mm3, %%mm5\n" // lum2
		309	"paddw %%mm1, %%mm3\n" // lum2 +red 00 R7 00 R5 00 R3 00 R1
		310	"paddw %%mm2, %%mm5\n" // lum2 +green 00 G7 00 G5 00 G3 00 G1
		311	"psraw $6, %%mm3\n" // R2
		312	"por %%mm6, %%mm4\n" // MM4
		313	"psraw $6, %%mm5\n" // G2
		314	"movq (%2, %4), %%mm6\n" // L3 load lum2
		315	"psraw $6, %%mm7\n"
		316	"packuswb %%mm3, %%mm3\n"
		317	"packuswb %%mm5, %%mm5\n"
		318	"packuswb %%mm7, %%mm7\n"
		319	"pand _MMX_00FFw, %%mm6\n" // L3
		320	"punpcklbw %%mm3, %%mm3\n"
		321	"punpcklbw %%mm5, %%mm5\n"
		322	"pmullw _MMX_Ycoeff, %%mm6\n" // lum3
		323	"punpcklbw %%mm7, %%mm7\n"
		324	"psllw $3, %%mm5\n" // GREEN 2
		325	"pand _MMX_red565, %%mm7\n"
		326	"pand _MMX_red565, %%mm3\n"
		327	"psrlw $11, %%mm7\n" // BLUE 2
		328	"pand _MMX_grn565, %%mm5\n"
		329	"por %%mm7, %%mm3\n"
		330	"movq (%2,%4), %%mm7\n" // L4 load lum2
		331	"por %%mm5, %%mm3\n" //
		332	"psrlw $8, %%mm7\n" // L4
		333	"movq %%mm4, %%mm5\n"
		334	"punpcklwd %%mm3, %%mm4\n"
		335	"pmullw _MMX_Ycoeff, %%mm7\n" // lum4
		336	"punpckhwd %%mm3, %%mm5\n"
		337
		338	"movq %%mm4, (%3)\n" // write row1
		339	"movq %%mm5, 8(%3)\n" // write row1
		340
		341	"movq %%mm6, %%mm4\n" // Lum3
		342	"paddw %%mm0, %%mm6\n" // Lum3 +blue
		343
		344	"movq %%mm4, %%mm5\n" // Lum3
		345	"paddw %%mm1, %%mm4\n" // Lum3 +red
		346	"paddw %%mm2, %%mm5\n" // Lum3 +green
		347	"psraw $6, %%mm4\n"
		348	"movq %%mm7, %%mm3\n" // Lum4
		349	"psraw $6, %%mm5\n"
		350	"paddw %%mm0, %%mm7\n" // Lum4 +blue
		351	"psraw $6, %%mm6\n" // Lum3 +blue
		352	"movq %%mm3, %%mm0\n" // Lum4
		353	"packuswb %%mm4, %%mm4\n"
		354	"paddw %%mm1, %%mm3\n" // Lum4 +red
		355	"packuswb %%mm5, %%mm5\n"
		356	"paddw %%mm2, %%mm0\n" // Lum4 +green
		357	"packuswb %%mm6, %%mm6\n"
		358	"punpcklbw %%mm4, %%mm4\n"
		359	"punpcklbw %%mm5, %%mm5\n"
		360	"punpcklbw %%mm6, %%mm6\n"
		361	"psllw $3, %%mm5\n" // GREEN 3
		362	"pand _MMX_red565, %%mm4\n"
		363	"psraw $6, %%mm3\n" // psr 6
		364	"psraw $6, %%mm0\n"
		365	"pand _MMX_red565, %%mm6\n" // BLUE
		366	"pand _MMX_grn565, %%mm5\n"
		367	"psrlw $11, %%mm6\n" // BLUE 3
		368	"por %%mm5, %%mm4\n"
		369	"psraw $6, %%mm7\n"
		370	"por %%mm6, %%mm4\n"
		371	"packuswb %%mm3, %%mm3\n"
		372	"packuswb %%mm0, %%mm0\n"
		373	"packuswb %%mm7, %%mm7\n"
		374	"punpcklbw %%mm3, %%mm3\n"
		375	"punpcklbw %%mm0, %%mm0\n"
		376	"punpcklbw %%mm7, %%mm7\n"
		377	"pand _MMX_red565, %%mm3\n"
		378	"pand _MMX_red565, %%mm7\n" // BLUE
		379	"psllw $3, %%mm0\n" // GREEN 4
		380	"psrlw $11, %%mm7\n"
		381	"pand _MMX_grn565, %%mm0\n"
		382	"por %%mm7, %%mm3\n"
		383	"por %%mm0, %%mm3\n"
		384
		385	"movq %%mm4, %%mm5\n"
		386
		387	"punpcklwd %%mm3, %%mm4\n"
		388	"punpckhwd %%mm3, %%mm5\n"
		389
		390	"movq %%mm4, (%5)\n"
		391	"movq %%mm5, 8(%5)\n"
		392
		393	"addl $8, %6\n"
		394	"addl $8, %2\n"
		395	"addl $4, %%ebx\n"
		396	"addl $4, %1\n"
		397	"cmpl %4, %6\n"
		398	"leal 16(%3), %3\n"
		399	"leal 16(%5),%5\n" // row2+16
		400
		401
		402	"jl 1b\n"
		403	"addl %4, %2\n" // lum += cols
		404	"addl %8, %3\n" // row1+= mod
		405	"addl %8, %5\n" // row2+= mod
		406	"movl $0, %6\n" // x=0
		407	"cmpl %7, %2\n"
		408	"jl 1b\n"
		409	"emms\n"
		410	"popl %%ebx\n"
		411	:
		412	:"m" (cr), "r"(cb),"r"(lum),
		413	"r"(row1),"r"(cols),"r"(row2),"m"(x),"m"(y),"m"(mod)
		414	: "%ebx"
		415	);
		416	}
		417
		418	#endif /* GCC i386 inline assembly */

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(root)/contrib/sdk/sources/SDL-1.2.2/src/video/SDL_yuv_mmx.c – Rev 5131